This publication is available at Army Knowledge Online (www.us.army.mil) and General Dennis J.

Reimer Training and Doctrine Digital Library at (www.train.army.mil).

## Pathfinder Operations Contents


PREFACE
Chapter 1
INTRODUCTION

Employment

Capabilities

Limitations

Equipment

Communications Security

Training
Chapter 2
PLANS, ORGANIZATION, CONDUCT, AND THREAT

Section I. PLANS

Warning Order

Initial Preparations

Coordination

Linkup with Supported Unit

Final Preparations

Section II. ORGANIZATION FOR COMBAT

Insertion

Overland Movement

Stay-Behind Operation

Section III. CONDUCT OF OPERATIONS

Daylight Assault

Night Assault

Extraction

Staging Areas

Artillery Displacement

Support of Ground Operations

Support of Air Force

Mixed Operations

Radio Communications

Terminal Guidance by Supported Units

Section IV. HIGH-THREAT ENVIRONMENT

Control and Navigation

Tactical Instrument Flights

Air Routes

## Chapter 3 Air Traffic Control


Section I. PATHFINDER AIR TRAFFIC

Safety

Voice Control

Formats

Numbers

Phrases and Terms

Section II. LANDINGS

Traffic Patterns

Methods of Entry

Traffic Pattern Legs

Advisory Service

Spacing Techniques

Final Landing Instructions

Taxiing Aircraft

Minimum Aircraft Separation Requirements

Section III. GROUND-TO-AIR COMMUNICATIONS

Electronic Warfare Environment

Ground-to-Air Transmissions

## Chapter 4 Helicopter Landing Zones


Section I. SELECTION OF LANDING SITES

Considerations
Alternate Sites


Section II. ORGANIZATION AND DUTIES

Control Center

Landing Site Party

Section III. LANDING SITE OPERATIONS

Communications

Flight Formations

Landing Zone and Obstacle Markings

Air Assaults

Intercept Headings

Section IV. LANDING ZONE OPERATIONS

Communications Checkpoint

Air Control Points

Section V. NIGHT OPERATIONS

Tactical Landing Lights

External Loads

Multihelicopter Operations

Night Vision Goggles

Section VI. ENVIRONMENTAL CONSIDERATIONS

Pilot Input

Cold Weather

Jungle

Desert

Mountains

Section VII. APPROACH PATH CONSIDERATIONS

Vertical Air Currents

Escape Routes

Terrain Contour and Obstacles

Position of the Sun
Chapter 5
EXTERNAL LOADS

Landing Points

Types of Loads

Unit Responsibilities

Equipment

Service Life of Aerial-Delivery Slings

Aircraft Load Limitations

Standard Weights

Air Items Required For Common Standard Loads

Slingload Theory

Hookup and Release Procedures

Slingload Inspection Record

## Chapter 6 Drop Zones Section I. Selection Factors


Airdrop Airspeeds

Drop Altitude

Type of Load

Methods of Delivery

Obstacles

Access

Size

Approach and Departure Routes

Section II. DROP ZONE SUPPORT TEAM

Organization

Missions

Equipment Familiarization

Coordination

Support Requirements

Duties of the Leader

Control Center

Signals

Determination of Release Point Location

Ground-Marked Release System

Army Verbally Initiated Release System

Air Force Verbally Initiated Release System

Air Force Computed Air Release Point

Assault Zone Availability Report

AF IMT 3823, Drop Zone Survey

AF IMT 4304, Drop Zone/Landing Zone Control Log

## Appendix A Close Air Support And Close Combat Attack


Definitions

Purpose

Types of Aircraft

Target Types

Weapons Effects

Aircraft Weapons Types

Risk Estimated Distances

Target to Weapons
Appendix B
OPERATIONAL FORMATS

Planning Format

Landing Zone and Drop Zone Control Records

Troop-Leading Procedures
Appendix C
ARMY HELICOPTER SPECIFICATIONS

Observation Helicopters

Attack Helicopters

Utility Helicopters

Cargo Helicopters
Appendix D
DIGITIZATION SUPPLEMENT

Definition

Purpose, Advantages, and Capabilities
Appendix E
AIR FORCE INSTRUCTION

Airdrop Airspeeds

Drop Zone Size

Ground Marked Release System

Point of Impact

## Glossary References Index Figures

Figure 2-1. En route communication procedures with pathfinders in a
landing zone
Figure 2-2. Comparison of air routes with and without a high-threat
environment
Figure 3-1. Air traffic patterns Figure 3-2. 360-degree turnout. Figure 3-3. Traffic pattern extension Figure 3-4. Minimum separation requirements Figure 4-1. Landing point sizes Figure 4-2. Standard flight and landing formations Figure 4-3. Determination of ground slope. Figure 4-4. Maximum angle of approach (daylight). Figure 4-5. Maximum angle of approach (night) Figure 4-6. Approach and exit path Figure 4-7. Example completed DA Form 7461-R
Figure 4-8. Helicopter day landing site, staggered trail-right formation
Figure 4-9. Helicopter day landing site, echelon right formation Figure 4-10. Day or night slingload operation site. Figure 4-11. Day or night cargo landing site, "V" formation Figure 4-12. Night landing site with landing points for aircraft and
slingloads
Figure 4-13. Utility helicopter night landing site, diamond formations Figure 4-14. Lighted night landing symbols as the pilot would see them
from different approach angles
Figure 4-15. Intercept heading technique Figure 4-16. Terrain flight modes Figure 4-17. Placement of the inverted "Y" or NATO "T" at the number
one touchdown point
Figure 4-18. Placement of additional touchdown point markings for
night use
Figure 4-19. Placement of fifth light using inverted "Y," when
coordinated
Figure 4-20. Emergency night lighting by vehicle headlights
Figure 4-21. Lessening the effects of loose snow on the ground
Figure 6-1. Recommended safety zones for high-tension lines Figure 6-2. Example application of D=RT formula Figure 6-3. Example application of T=D/R formula
Figure 6-4. Example application of D=KAV formula.
Figure 6-5. Raised-angle marker. Figure 6-6. Drop zone coordination checklist Figure 6-7. Drop zone cancellation and closing markers Figure 6-8. Release point location. Figure 6-9. Panel emplacement Figure 6-10. Horizontal clearance and marker construction Figure 6-11. The 15-to-1 mask clearance ratio Figure 6-12. Example Army VIRS offset Figure 6-13. Wind streamer vector count. Figure 6-14. Example USAF VIRS transmission Figure 6-15. Drop zone placement (day) Figure 6-16. Code letters Figure 6-17. Drop zone placement (night) Figure 6-18. Area drop zone
Figure 6-19. Computation of circular drop zone.
Figure 6-20A. Example completed AF IMT 3823 (front). Figure 6-20B. Example completed AF IMT 3823 (back) Figure 6-21. Example completed AF IMT 4304 Figure C-1. OH-58D Kiowa Figure C-2. AH 64A Apache Figure C-3. AH 64D Apache Figure C-4. UH-1H Iroquois Figure C-5. UH-60A/L Blackhawk

## Tables

Table 2-1. Air liaison officer's and ground unit commander's
coordination of air movement table
Table 3-1. Numbers transmitted by units or digits Table 3-2. Phrases Table 3-3. Terms Table 3-4. Traffic pattern legs
Table 3-5. A 360-degree turnout
Table 3-6. Light signals on or near a landing zone Table 3-7. Information included in advisories Table 4-1. Landing point uses
Table 4-2. Length of minimum width area.
Table 5-1. Aerial delivery specifications for the Type XXVI sling. Table 5-2. Safe working loads (lift capacities) of polyester roundslings Table 5-3. Large-capacity sling sets Table 5-4. POL for external loads only. Table 5-5. Standard vehicle weights Table 5-6. Standard artillery weights. Table 6-1. Airspeeds for rotary-wing aircraft Table 6-2. Airspeeds for fixed-wing aircraft Table 6-3. Example calculation of drop altitude in feet indicated. Table 6-4. Airdrop altitudes for rotary- and fixed-wing aircraft Table 6-5. Minimum aerial delivery altitudes Table 6-6. Size criteria for tactical airlift drop zones, personnel, and
heavy equipment
Table 6-7. Size criteria for tactical airlift drop zones, Container Delivery
System
Table 6-8A. Conversion chart for 10-gram helium (pilot) balloons Table 6-8B. Conversion chart for 30-gram helium (pilot) balloons Table 6-9. Forward throw distances for fixed-wing aircraft Table 6-10. Surface wind limits for airdrops Table 6-11. Favorable conditions for airdrops on tactically assessed
DZs
Table A-1. CAS theater aircraft Table A-2. Risk estimated distances Table A-3. Target to weapons Table C-1. Specifications for the OH-58D Kiowa Table C-2. Specifications for the AH 64A Apache Table C-3. Specifications for the AH 64D Apache Table C-4. Specifications for the UH-1H Iroquois Table C-5. Specifications for the UH-60A Blackhawk Table C-6. Specifications for the CH-47 D Chinook Table E-1. Airdrop airspeeds Table E-2. Standard drop zone size criteria Table E-3. Ground marked release system load drift constants (K) Table E-4. Ground marked release system forward throw distance Table E-5. Standard point-of-impact placement
Distribution Restriction: Approved for public release; distribution is unlimited.

*This publication supersedes FM 3-21.38, 1 October 2002.

## Preface

This publication provides a foundation for training and employing pathfinder and terminal guidance personnel. The tactics, techniques, and procedures that describe the conduct of the various missions are guides. The pathfinder leader can modify them to suit the particular air assault operation. This publication applies to the Active Army, the Army National Guard (ARNG), the Army National Guard of the United States (ARNGUS), and the United States Army Reserve (USAR) unless otherwise stated. The manual includes an extensive glossary of acronyms and terminology peculiar to air assault operations, pathfinder operations, and Army-Air Force air traffic control. Using this glossary will help the reader understand the text.

This publication prescribes DA Form 7461-R, *Internal Net Record*, and implements the following international agreements:

-  QSTAG 585, *Marshaling Helicopters in Multinational Land Operations*,
23 Apr 81
(*see* Chapter 4).
-  STANAG 2863, Navigational and Communication Capabilities for
Helicopters in Multinational Land Operations, 26 Sep 88
(*see* Chapters 2 and 3).
-  STANAG 3117, *Aircraft Marshaling Signals*, 17 Oct 85
(*see* Chapters 1 and 2).
-  STANAG 3281, *Personnel Locator Beacons*, 3 Apr 78
(*see* Chapters 1, 3, and 4).
-  STANAG 3570, Drop Zones and Extraction Zones--Criteria and
Markings, 26 Mar 86 (*see* Chapters 2 and 6).
-  STANAG 3619, *Helipad Marking*, 10 Jul 80
(*see* Chapter 4).
The proponent for this publication is the United States Army Training and Doctrine Command. The preparing agency is the U.S. Army Infantry School. You may send comments and recommendations by any means, US mail, e-mail, fax, or telephone, as long as you use or follow the format of DA Form 2028, *Recommended Changes to Publications and Blank Forms*. You may also phone for more information.

george.moore2@benning.army.mil Phone COM 706-545-3458 or DSN 835-3458
Fax COM 706-545-6489 or DSN 835-6489
US Mail  Commandant, USAIS
ATTN: ATSH-TPP-H /Bldg 2767 Fort Benning, GA 31905-5593
Unless this publication states otherwise, masculine nouns and pronouns do not refer exclusively to the male gender.

## Chapter 1 Introduction

Army pathfinders mainly provide navigational aid and advisory services to military aircraft in areas designated by supported unit commanders. The pathfinders' secondary missions include providing advice and limited aid to units planning air assault or airdrop operations.

## Employment

1-1. The pathfinders provide navigational aid and air traffic advisories for Army aircraft. This occurs at any phase of an air assault or ground operation that requires sustained support by Army aircraft. The commander employs pathfinders on a short-term basis for some missions. He can redeploy the pathfinders after they complete a major troop lift or airdrop.

## Primary

1-2. Ideally, the commander assigns a pathfinder team to each combat aviation battalion. This enhances the relationship between aviators and pathfinders, who have to work well together and understand each other to complete a mission successfully. Aviators and pathfinders must maintain a good working relationship, despite the limited number of pathfinder units and the assignment of pathfinder-coded positions to ground units. 1-3. Many units might have no trained pathfinder assets. In this case, higher headquarters must temporarily assign pathfinder assets from an external source to train supported unit personnel and oversee the conduct of pathfinder operations. 1-4. Non-pathfinder-qualified Soldiers receive training from the pathfinders and form a company-level pathfinder team. Once trained, the team provides navigational aid, air traffic advisories, and any other relevant information. Around the clock, the pathfinder team supports any type of air movement or resupply operation conducted by or for the ground unit and supported by an aviation unit.

1-5. Trained, equipped pathfinders select, mark, improve, and control landing sites. Engineers in direct support (DS) of lifted ground units may help pathfinders improve landing zones (LZs). In most situations, pathfinders perform two or more of these jobs at the same time. In each case, they start out by setting up ground-to-air radio communications. Combat lifesaver-qualified and emergency medical technician (EMT)- qualified pathfinders also supplement internal medical support.

## Secondary

1-6. When not performing duties for supported units, pathfinders remain with their equipment, near and in communication with the supported ground unit command post (CP). While pathfinders await further missions, the parent or supported CP may task them to help control the aviation unit base airfield; to perform minor demolition work; or, in staff sections, to perform map and aerial photographic work. However, before the pathfinders perform secondary missions, they must train and perform routine maintenance on their equipment.

## Capabilities 1-7. Appropriately Equipped And Trained Pathfinders

-  Reconnoiter areas selected by supported unit commanders. -  Select helicopter land zones (HLZs) and drop zones (DZs). -  Infiltrate areas of operation by foot, vehicle, watercraft, or air. -  Rappel, fast rope, or parachute from aircraft. -  Prepare HLZs and DZs. -  Establish and operate visual and electronic navigation aids. -  Remove minor obstacles. -  Use ground-to-air (GTA) radio communications to guide pilots and
advise them of air traffic within the area of operations (AO).
-  Coordinate directly with fire support units and keep pilots informed
about friendly mortar and artillery fires.
-  Provide technical assistance in assembling supplies, equipment, and
troops before loading the aircraft for deployment to HLZs and DZs.
-  Advise and provide limited physical assistance in preparing and
positioning supplies, equipment, and troops for air movement.
-  Conduct limited chemical, biological, radiological, or nuclear
(CBRN) monitoring and surveying of designated areas.
-  Provide limited weather observations, to include wind velocity and
direction, cloud cover, visibility, and approximate cloud ceiling.
-  In the absence of a special tactics team (STT), by agreement with
the United States Air Force (USAF), operate DZs and airfields for
USAF aircraft.
-  Survey DZs for use by USAF and Army aircraft. In this situation,
pathfinders might require USAF-compatible ultra high frequency (UHF) or very high frequency (VHF) radios. Aviators and pathfinders coordinate to make sure everyone knows the ground marking and radio procedures.

## Limitations

1-8. Pathfinders require augmentation when they guide aircraft or perform other, related primary tasks such as the following:

-  Provide security. -  Remove major obstacles. -  Recover and assemble equipment and supplies. -  Operate additional radio nets and telephones.
-  Transport equipment. -  Conduct detailed CBRN monitoring and surveying.

## Equipment

1-9. Pathfinders use a variety of equipment. Though the aviation unit standing operating procedures (SOP) may specify the type of equipment pathfinders will use, the mission dictates what specific items of equipment the pathfinders will take on the operation.

## Navigation Aids

1-10. Pathfinders use navigation aids to help aviators find and identify an exact area.

## Electronic

1-11. With these aids, pathfinders can signal farther than they can with visual navigation aids. Electronic navigation aids include

-  Homing beacons. -  Transponders. -  Radios. -  Any other electronic devices that can aid in aircraft navigation.

## Visual

1-12. With these aids, pathfinders can designate specific areas or points on LZs and DZs. They use them as GTA signals. Unfortunately, because visual aids are visible, the enemy can also see them.

## Day

1-13. Visual navigation aids that can be used during the day include
-  Panels. -  Smoke. -  Signal mirrors. -  Colored gloves and vests for signalmen.

## Night

1-14. Visual navigation aids that can be used during the night include
-  Light beacons. -  Lanterns. -  Baton flashlights.
-  Strobe lights.
-  Pyrotechnics. -  Chem-lights.

## Day Or Night

1-15. Pathfinders can make field-expedient visual aids for day or night.

## Infrared

1-16. At night, pathfinders can use any infrared navigation aids that are compatible with their night vision goggles (NVG).

## Communications

1-17. Pathfinders use FM radios with secure capability and limited wire equipment. These radios allow pathfinders to communicate with aircraft, other pathfinder elements, and supported units. Incorporated homing capabilities in these radios allow pathfinders to provide navigational aid to aircraft.

## Assembly Aids

1-18. Pathfinders use assembly aids to designate troop and supply assembly areas. Assembly aids include electronic, visual, and infrared devices. The pathfinders can also use or make field-expedient devices to aid in assembly. Because assembly aids can attract the enemy's attention, pathfinders must carefully avoid compromise.

## Electronic

1-19. These include radios and homing devices that work by radio signal. Enemy direction-finding equipment detects electronic signals.

## Visual

1-20. These simple-to-use aids allow positive identification of assembly areas. The enemy can also see them. To ensure understanding, pathfinders must closely coordinate the use of visual assembly aids. (See TM 9-1370-206-10, FM 21-60, and STANAGs 3117 and 3281.) Visual assembly aids include the following:

## Day

1-21. Visual assembly aids that can be used during the day, which include

-  Panels. -  Smoke. -  Armbands.

## Night

1-22. Visual assembly aids that can be used during the night, which include

-  Lanterns. -  Flashlights. -  Light beacons. -  Strobe lights. -  Chem-lights. -  Pyrotechnics.

## Infrared

1-23. Pathfinders can use infrared light sources as assembly aids, but if they do so, both the pathfinders and the pilots must use night vision devices (NVDs).

## Miscellaneous

1-24. Pathfinder equipment also includes

-  Vehicles. -  Binoculars.
-  Night vision devices.
-  Nonelectric demolition kits. -  Wind-measurement equipment. -  Parachutes. -  Equipment for detecting CBRN. -  Thermal sights.

## Communications Security

1-25. Pathfinders and terminal guidance personnel must know about any hostile data collection and exploitation activities. Such activities seek to disrupt, deceive, harass, or otherwise interfere with the command and control of pathfinder operations.

## Enemy Interception

1-26. The enemy can intercept, analyze, determine the direction of, and exploit electromagnetic energy radiating from any signal equipment such as radios, radar, and more. He uses this intelligence for fire and maneuver and for electronic countermeasures. 1-27. The enemy may collect pathfinder emissions data for immediate or later use. He may use jamming or deception, or he may continue to monitor and analyze the data for later use. 1-28. Time-distance factors limit the enemy's ability to exploit signal intelligence in support of his ground operations. He may use a reaction force, or he may find the source of the signal using direction finding (DF) equipment. If he uses DF equipment, he can also use electronic countermeasures (ECM) to jam and deceive the pathfinder's electronic aids.

## Pathfinder Awareness

1-29. Pathfinders must plan for the enemy's DF capabilities. Automated DF systems determine line bearings for each signal detected. The enemy continuously processes and compares line bearings and plots fixes for pathfinder signals. Depending on the size of the DF base and the number of DF systems available, the enemy may accurately locate a friendly position with little difficulty. 1-30. What the enemy does to gain signals intelligence (SIGINT) reveals his intent. In combating enemy DF systems, pathfinders consider the following:

-  The high priority of aviation-related missions.
-  The length of time the pathfinders remain on the air.
-  The number of pathfinder transmitters. -  The distance of friendly forces from enemy DF systems, enemy fire
and maneuver elements, and enemy collection and jamming resources.
-  Friendly actions to mask pathfinder operations.
1-31. Strict signal security practices, to include electronic warfare (EW), greatly reduce the vulnerability of signal devices to enemy exploitation. (FM 24-18 provides more information on communications.)

## Training

1-32. Personnel qualify as pathfinders only by completing the pathfinder course at the US Army Infantry School, Fort Benning, Georgia.

## Goals

1-33. The pathfinder training program stresses

-  The development of individual proficiency in air traffic control
procedures.
-  That pathfinders learn and know the SOP of the aviation and
ground units they support.
-  Proficiency in slingload operations. -  Establishment of helicopter landing zones and drop zones. -  Drop zone support team leader (DZSTL) and drop zone safety
officer (DZSO) operations.
-  Expertise in all aspects of long- and short-range communication
(both of which are conducted at unit level).

## Commander's Responsibilities

1-34. Major unit commanders who use pathfinders bear the responsibility for sustaining the pathfinders' training and proficiency. Pathfinder training works best when integrated with the training of supported aviation and ground units.

## Pathfinder's Responsibilities

1-35. The assigned, qualified, and trained pathfinder must ensure that any nonqualified Soldiers assigned to his unit team receive adequate pathfinder training before going on a mission.

## Chapter 2 Plans, Organization, Conduct, And Threat

Pathfinders conduct many different missions. Several of these supplement the ground unit's operation.

## Section I. Plans

To ensure success of the ground mission, pathfinders plan their own missions in detail. The more time they have to make plans, the more detailed plans they can make.

## Warning Order

2-1. As soon as he receives word of a pending operation, the senior pathfinder issues a mission alert. He immediately follows with a warning order. He includes just enough information to allow the other pathfinders to start preparing for the operation. This includes

-  Roll call. -  Enemy and friendly situations (in brief). -  Mission. -  Chain of command and task organization. -  Individual uniform and equipment (if not discussed in the SOP). -  Required equipment. -  Work priorities (who does what, when, and where). -  Specific instructions. -  Attached personnel. -  Coordination times.

## Initial Preparations

2-2. On receiving the alert or warning order, pathfinders inspect and, as needed, augment personnel and equipment. Pathfinders prepare equipment in the following order, from the most to the least important:

-  Radios. -  Navigation aids (electronic and visual).
-  Weapons.
-  Essential individual equipment. -  Assembly aids. -  Other items as needed.
2-3. The pathfinder element leader (or his representative) and the air mission commander begin coordinating with the supported aviation unit(s), ground unit(s), or both. 2-4. As the pathfinders receive more information, they reorganize personnel and equipment to accomplish the mission better. If time permits, they rehearse. Rehearsals are the time to make sure the members on the pathfinder team are completely aware of their duties for that specific mission. They use available briefing aids, and they rehearse on terrain that most nearly resembles the AO. 2-5. To succeed, an operation must have security. So, each person receives only the information he must have to complete each phase of the operation. For example, the commander isolates any Soldiers who know the details of the operation. The situation dictates the extent of security requirements.

## Coordination

2-6. Ground and aviation commanders work together to coordinate and plan the details of operations for which they require pathfinder assistance. 2-7. In any type of operation (combat assault, reinforcement, artillery displacement, resupply, or evacuation), the pathfinders might have to recommend

-  Exact locations for DZs or LZs. -  A time schedule. -  Landing formations. -  Employment techniques.
2-8. Before selecting a DZ or LZ, the supported unit commander considers the factors of METT-TC (mission, enemy, terrain and weather, troops, time, and civil considerations). He also considers what the pathfinder and aviation commanders (or their representatives) suggest. 2-9. While preparing for an operation, air liaison officers (ALOs) and ground unit commanders (GUCs) coordinate with pathfinders to make an air movement table. Table 2-1 shows who coordinates what.

## Sequence Alo Guc Coordinate With Pathfinders

| 1                                         | X   | X                                                | Operational location (coordinates).   |
|-------------------------------------------|-----|--------------------------------------------------|---------------------------------------|
| 2                                         | X   | Locations of the primary and alternate           |                                       |
| communications checkpoints (coordinates). |     |                                                  |                                       |
| 3                                         | X   | Location of release point.                       |                                       |
| -  Coordinates.                           |     |                                                  |                                       |
| -  Whether manned or unmanned.            |     |                                                  |                                       |
| 4                                         | X   | X                                                | Time the site can begin operating.    |
| 5                                         | X   | Aircraft information.                            |                                       |
| -  Formation.                             |     |                                                  |                                       |
| -  Time interval.                         |     |                                                  |                                       |
| -  Time of flight.                        |     |                                                  |                                       |
| -  Drop speed.                            |     |                                                  |                                       |
| -  Drop altitude.                         |     |                                                  |                                       |
| 6                                         | X   | Pathfinder transportation and time available for |                                       |
| briefing.                                 |     |                                                  |                                       |
| 7                                         | X   | Pathfinder transportation station time.          |                                       |
| 8                                         | X   | X                                                | Routes into the objective area.       |
| 9                                         | X   | X                                                | Call signs.                           |
| -  Aircraft.                              |     |                                                  |                                       |
| -  Pathfinders.                           |     |                                                  |                                       |
| -  Supported units.                       |     |                                                  |                                       |
| -  Other friendly units.                  |     |                                                  |                                       |
| 10                                        | X   | X                                                | Primary and alternate frequencies.    |
| -  Aircraft.                              |     |                                                  |                                       |
| -  Pathfinders.                           |     |                                                  |                                       |
| -  Supported units.                       |     |                                                  |                                       |
| -  Other friendly units.                  |     |                                                  |                                       |
| -  Homing beacon.                         |     |                                                  |                                       |
| 11                                        | X   | X                                                | Fire support.                         |
| -  Artillery.                             |     |                                                  |                                       |
| -  Tactical air support.                  |     |                                                  |                                       |
| 12                                        | X   | Weather forecast.                                |                                       |
| -  Ceiling.                               |     |                                                  |                                       |
| -  Visibility.                            |     |                                                  |                                       |
| -  Temperatures (high and low).           |     |                                                  |                                       |
| 13                            | X                                                 | X                                                     | Logistical support, including locations of   |
|-------------------------------|---------------------------------------------------|-------------------------------------------------------|-----------------------------------------------|
| -  Medical aid station.       |                                                   |                                                       |                                               |
| -  Prisoner collection point. |                                                   |                                                       |                                               |
| -  Fuel.                      |                                                   |                                                       |                                               |
| -  Ammunition.                |                                                   |                                                       |                                               |
| -  Rations.                   |                                                   |                                                       |                                               |
| 14                            | X                                                 | X                                                     | Alternate plans (ALO and GUC).                |
| -  Evacuation plan.           |                                                   |                                                       |                                               |
| -  Escape and evasion.        |                                                   |                                                       |                                               |
| 15                            | X                                                 | X                                                     | Friendly unit locations.                      |
| 16                            | X                                                 | X                                                     | Authority to implement mission change.        |
| 17                            | X                                                 | Support personnel required.                           |                                               |
| 18                            | X                                                 | No-land or no-drop signals (day and night).           |                                               |
| 19                            | Markings for obstacles (only on request of flight |                                                       |                                               |
| commander).                   |                                                   |                                                       |                                               |
| 20                            | X                                                 | Marking of objective site for identification from the |                                               |
| air.                          |                                                   |                                                       |                                               |
| 21                            | X                                                 | X                                                     | Time allowed for approval.                    |

2-10. The pathfinder needs this information because he helps coordinate planning. He uses the information to make final plans for the pathfinder phase of the operation. To make sure that he can safely and efficiently control all aircraft in and around the DZs or LZs, he must know all about the operation's air movement phase. Aviation and ground commanders inform pathfinders of all changes to plans and landing sites, and about any emergencies. The pathfinder coordinates all activities with every agency or unit involved, and then gives the information to all of the pathfinders involved in the operation. 2-11. When the pathfinder reaches the objective site, he may find it unsuitable. He evaluates the coordinated landing formation, heading, drop altitude, and the ground site itself. Then he coordinates with the ground commander, aviation commander(s), or both to see whether any of the original requirements have changed. Depending on the mission, enemy, terrain, troops, time, and civil considerations (METT-TC), the commander(s) determines what, if any, changes to make to accomplish the mission. If for any reason he cannot contact the GUC or aviation commander, the pathfinder can also coordinate for authority to change requirements. 2-12. The pathfinder limits augmentation to that appropriate to the amount and type of transport. The reinforced pathfinder team remains under the command of the pathfinder leader, who is responsible for team functions. Based on the coordinated plans for the operation, the pathfinder requests augmentation in personnel and equipment. He considers

-  Mission. -  Use of personnel and equipment for security. -  Requirement to help assemble the supported units' personnel,
supplies, and equipment.
-  Need for assistance in removing obstacles. -  Assistance required to transport and operate navigation aids under
pathfinder direction.

## Linkup With Supported Unit

2-13. Pathfinders join the supported unit early enough to allow final coordination between pathfinder, aviation, and lifted ground unit representatives. Pathfinders designated to accompany and provide continuous support to a ground unit can enter a DZ or LZ ahead of the assault echelon. After the initial phase of the air movement, they link up with the supported unit.

## Final Preparations

2-14. The pathfinder leader issues his operation order (OPORD). If he issues it before linking up with the supported unit, he issues any changes as a fragmentary order (FRAGO). The order describes any member's duties not covered in the unit SOP. Team members must have a chance to study maps, aerial photos, and terrain models of the area. The order provides details about the location and operation of proposed air delivery facilities, flight routes, flight formations, time schedules, release points (RPs), and communication checkpoints (CCPs). 2-15. The pathfinder conducts a final, thorough check of equipment. The commander decides exactly how to transport the equipment into the objective area. Then the pathfinders prepare all of the equipment for rapid displacement. 2-16. Just before departure, at a final weather and operational briefing, the pathfinders and supported units conduct final coordination.

## Section Ii. Organization For Combat

The pathfinder mission itself determines the specific requirements of the mission. In most operations, three to six Soldiers comprise the pathfinder element supporting a DZ or an LZ or continuously supporting an Infantry battalion. Seldom does a pathfinder section deploy as a unit from a single location. The pathfinder leader plans for his elements to operate widely separated and disconnected.

## Insertion

2-17. Pathfinders can insert by a variety of air, sea, or land transportation modes.

## Helicopter Delivery

2-18. Helicopters can deliver more personnel and equipment in a better state of operational readiness than any other means. Even in marginal weather, helicopters allow more precise, flexible deliveries than parachutes do. Some terrain does not allow helicopter landings. In these cases, trained Soldiers rappel or fast rope from helicopters while the helicopters hover over the unsuitable landing areas. Personnel can insert or withdraw by ladders suspended from hovering helicopters, or extract using special patrol insertion-extraction system (SPIES) techniques. Helicopters can also

-  Rapidly shift or evacuate pathfinders. -  Carry nonparachutists to support pathfinders. -  Deliver when rain or low ceilings prohibit parachuting. -  Rapidly change insertion locations.

## Parachute Delivery

2-19. Parachute delivery by fixed-wing aircraft normally affords greater range and speed of movement than landing by helicopter. In a shortdistance operation, helicopters can serve as the jump aircraft. 2-20. Depending on wind conditions, pathfinders should compute their desired parachute RPs before arriving over the DZ. For accuracy and security, the pathfinders jump at the lowest practical altitude. Aircraft SOPs prescribe jump altitudes and personnel procedures. Such procedures vary in accordance with (IAW) peacetime and wartime restrictions. 2-21. As highly trained parachutists, pathfinders can insert into unimproved and marginal DZs. They know how to control the canopy of a maneuverable parachute, and they know how to make emergency landings. They also know how to parachute into rough-terrain DZs. These skills give them some flexibility in planning parachute delivery.

## Caution

During preparation for the operation, pathfinders
carefully arrange and pad all essential items of
operational equipment into appropriate containers.
Carrying this equipment with them when they insert
ensures they have it as soon as they land.

2-22. The best time to insert by parachute is during nonilluminated, nonsupported night operations that emphasize secrecy. 2-23. Because fixed-wing aircraft need large, secure, obstacle-free landing areas, they seldom deliver pathfinders.

## Water And Land Delivery

2-24. Delivering pathfinders by watercraft offers security only up to the point of debarkation from the craft. The pathfinders still must move from the landing point (debarkation) to their final destination. To do this, they infiltrate by land.

## Overland Movement

2-25. Because it limits small elements to short movements, infiltrating by land is the worst way to insert pathfinders. 2-26. A well-organized, stable, close-knit enemy defense in depth can prohibit land infiltration. When time allows, the pathfinders can increase infiltration security by combining overland infiltration with parachute or airland infiltration. 2-27. Pathfinders infiltrate overland when the following conditions exist:

-  Limited visibility over difficult terrain. -  Overextended enemy lines. -  Fluid combat zone. -  Unsecured portions of enemy boundaries.

## Stay-Behind Operation

2-28. In a stay-behind operation, pathfinder elements remain in the operational area while another friendly force withdraws from the area.

The commander can use stay-behind operations for the following reasons:

-  To lure enemy forces into a vulnerable position. -  To hold an area for reoccupation. If the commander plans to
reoccupy a friendly area he knows the enemy could overrun, he leaves a stay-behind force to hold it. If he leaves the stay-behind force for this reason, then he must also plan an air assault to regain the area, if needed.

## Section Iii. Conduct Of Operations

Pathfinders provide air traffic advisories and navigational aid for airplanes and helicopters. They also perform limited physical improvement and CBRN monitoring and surveying within DZs or LZs. Pathfinder availability, the tactical plan, the complexity of the operation, the terrain, and the air assault proficiency of the supported ground unit dictate pathfinder support. However, every air assault operation requires positive aircraft control. During an air-assault operation, pathfinders cross load before entering an LZ with the initial assault elements.

## Daylight Assault

2-29. In daylight operations, pathfinders insert into an LZ before the initial assault echelon only if the LZ requires extensive improvement or if planners expect unusual control problems. Either way, the pathfinders start setting up at once so they can provide air traffic control and other aid to all subsequent lifts of troops, supplies, and equipment. They may have a few minutes or several hours to do this before the other elements arrive. The tactical plan spells out exactly when and how the pathfinders will enter the area, whether they will go in alone or not, and what time the next element will arrive.

## Night Assault

2-30. Security and operational requirements determine the method of delivering pathfinders at night. Pathfinders can move cross-country on foot, airdrop onto or near objective areas, airland in total blackout, or airland with minimum natural illumination. When they do insert this way, they sometimes arrive before the main body does. As soon as they arrive, the pathfinders reconnoiter the LZ, install visual and electronic aids, and establish air traffic control. Soldiers from the supported ground unit sometimes accompany the pathfinders. These additional Soldiers provide security and help clear obstacles. The on-site pathfinder element remains concealed and observes the objective. Pathfinders analyze the planned landing formation, heading, and assembly area. To avoid compromising the mission, no one on the DZ or LZ moves until an incoming aircraft reaches the CCP.

## Extraction

2-31. As the ground force at the LZ shrinks, vulnerability to attack increases. Therefore, the commander has pathfinders speed up the air assault extraction operations. 2-32. Planned artillery fires and air strikes as well as the need to maintain ground security to the last minute require that ground controllers control supporting aircraft throughout the extraction. This means they make sure aircraft land at specific points within the extraction site where ground security can cover them. This speeds the operation and helps ensure the safe withdrawal of personnel, equipment, and aircraft from the area. 2-33. Unless they land with the lifted unit, pathfinders must arrive at the extraction site in time to reconnoiter thoroughly and coordinate with the lifted unit. 2-34. During the planning stage, the pathfinder team leader designates near and far rally points for use in case the DZ or LZ becomes unusable. Pathfinders may have to fight their way to these rally points and reorganize. To increase the chance of survival, evasion, resistance, and escape, the team leader designates far rally points several kilometers from the DZ or LZ.

## Staging Areas

2-35. In staging areas, in the absence of air traffic control (ATC) units, pathfinders can provide air traffic advisories. They may also act as liaison between the aviation and ground units and help the ground unit commander prepare and position troops, supplies, and equipment for air movement. When pathfinders must set up a temporary staging area to support an operation of short duration, they move into the area before the operation begins. This gives them enough time to reconnoiter, mark the site, coordinate, and set up positive ATC. Safe, efficient, and rapid movement of helicopters or airplanes requires positive ATC in staging areas. The need for positive ATC increases when the weather deteriorates, when the number of aircraft increases, or when changes in the situation or plans require it.

## Artillery Displacement

2-36. Pathfinders should help safely and rapidly displace artillery, day or night. Coordinating with ground and aviation unit commanders and understanding their SOPs ensure pathfinders accurately and efficiently deliver equipment, personnel, and ammunition.

## Support Of Ground Operations

2-37. During ground operations that require sustained Army aviation support, pathfinders might continuously aid and control aircraft. The commander can attach pathfinders he has already attached to Infantry battalions to companies as well. The pathfinders provide support consistent with the availability of personnel and equipment. Continuous support improves operational efficiency and aviation safety during all types of air assault operations. However, aviation units with limited pathfinder resources cannot provide continuous support. In such cases, commanders usually employ pathfinders on a short-term, priority basis wherever the pathfinders can help accomplish major unit missions. In the absence of pathfinders, selected personnel in the ground units must receive enough training and preparation to allow them to provide minimum aid to supporting aircraft.

## Support Of Air Force

2-38. By joint US Army and USAF agreement, in the absence of USAF STTs, Army pathfinders can provide day or night control for USAF aircraft on airfields, DZs, and LZs. However, the pathfinders may need UHF and VHF communications equipment that is compatible with USAF aircraft.

## Mixed Operations

2-39. Some situations could require the simultaneous control of mixed air traffic at the same location, such as resupply parachute drops into forward helicopter LZs. Fixed-wing airfields can expect helicopter traffic. Mixed air traffic often presents difficult control problems, so controllers must apply strict control measures. To ensure control, they designate, coordinate, and clearly identify landing, parking, loading, unloading, refueling, and rearming areas.

## Radio Communications

2-40. For success, a pathfinder requires the essential element of communication by GTA voice radio. The pathfinders place this into operation first at a DZ or LZ, and they take it out of operation last. 2-41. Pathfinders must thoroughly understand radio procedures. This includes the phraseology unique to ATC (Chapter 3). They must send clear, concise, applicable, accurate, and correctly-timed communications. To achieve speed and clarity of transmission, pathfinders and aviators practice radio discipline. They transmit only necessary messages. Also, except in emergencies, they use pathfinder ATC frequencies only for ATC (Figure 2-1). 2-42. Because they exchange a lot of vital information, aircraft crews normally record the important parts of GTA messages. This helps them to make sure they understand and can follow instructions. 2-43. Pathfinders use electronic homing beacons, visual aids, and armand-hand signals to complement voice communications. Pilots and transported troops must know the purpose and meaning of the aids used and the techniques for using them (see STANAG 3570). (FM 21-60 discusses arm-and-hand signals and visual aids.) 2-44. When possible, to keep informed about changing situations that could influence their operations, pathfinders monitor supported unit command radio nets. 2-45. Pathfinders set up positive communications between pathfinder ATC facilities and collocated fire support elements. This ensures aircraft receive timely and accurate information about friendly fires. 2-46. Pathfinder operations require the constant use of radios. This gives the enemy force many chances to intercept, analyze, and exploit friendly transmissions. They try to gain intelligence and conduct electronic jamming and deception. Defeating enemy jamming or imitative deception methods falls mostly to the radio operator. He must know how to recognize and report this deliberate interference. To plan and execute a tactical mission, he must know how to

-  Defend against and beat ECM using electronic countercountermeasures (ECCM).
-  Secure transmissions. -  Communicate using other means.

## Terminal Guidance By Supported Units

2-47. Terminal guidance refers to information and minimal guidance given to pilots by anyone in a ground unit other than a qualified pathfinder. Selected personnel normally furnish terminal guidance within the supported unit. To do so, they use both organic and improvised equipment. 2-48. When pathfinders accompany ground units, aviation unit SOP may direct that terminal guidance personnel augment pathfinder elements. 2-49. Terminal guidance personnel should know the following:

-  The supporting aviation unit SOP. -  How to operate electronic and visual navigation aids to help
aircraft find DZs or LZs.
-  To provide essential information through GTA radio to guide and
control Army aircraft.
-  To reconnoiter and recommend suitable DZs or LZs. -  To determine, recommend, or perform ground-clearing pioneer
work to prepare DZs or LZs.

## Section Iv. High-Threat Environment

The threat comes in many forms. To ensure mission success, aviation and ground commanders must consider all possibilities. They must consider a threat anything that could disrupt or delay the mission, or that could otherwise cause the mission to fail.

## Control And Navigation

2-50. Pathfinders have limited voice control of aircraft. Thus, the ground unit commander and the air mission commander must coordinate closely. Navigation presents special problemsaviators must fly low to avoid detection. In a high-threat environment, critical factors include time, distance, routes, and tactical instruments. 2-51. For example, two pathfinders with beacons could emplace along a route in advance of the initial flight. They provide pilots with air control points. If the pilot needs the beacon turned on due to navigational error, he can transmit a prearranged signal or code word. 2-52. Pathfinders might discover a threat, such as an antiaircraft weapon, along the primary route. If so, they can alert pilots by prearranged code word or signal to change to an alternate route.

## Tactical Instrument Flights

2-53. Flying under instrument meteorological conditions poses special problems in a high-threat environment. This threat overrides the controlled instrument flight rules in the aviation-series manuals. It forces aircraft to fly at altitudes well below the minimums for normal instrument flight. 2-54. Weather variances can create a tactical emergency. If so, the commander might have to use aviation assets under instrument conditions and well below the altitudes specified by standard instrument flight rules. The commander will only send aircraft on a mission in a high-threat environment under these conditions when the situation meets the following criteria:

-  The aviation and ground commanders cannot postpone the mission
to wait for better weather.
-  The pathfinders must conduct the mission in a high-threat
environment.
-  Low visibility en route precludes nap-of-the-earth flight.
2-55. Aviation and ground commanders employ tactical instrument flight whenever weather or time and distance considerations prevent mission completion in other flight modes. Therefore, they must often use tactical instrument flight during round-the-clock operations on the high-threat battlefield. Aircrews and pathfinders must rehearse tactical instrument flight until they achieve proficiency.

2-56. Pilots fly in one of two altitude modes.

## Mode 1

2-57. When the air defense threat keeps flight altitudes below those established by AR 95-1 (for standard instrument flight), then pilots can fly at least 1,000 feet over mountainous terrain, and 500 feet over flat terrain.

## Mode 2

2-58. When the threat limits flight altitudes to the least possible clearances, pilots can fly as low as 50 to 500 feet above the ground, regardless of terrain.

## Air Routes

2-59. Aircraft traffic management personnel (and pathfinders) can expect to move their equipment as often as every four hours, depending on the threat. Terrain, weather, and, most importantly, whether the enemy could intercept friendly aircraft from that location, determine when to move.

## Threat And Terrain

2-60. In many instances, the threat and terrain prohibit a straight-line flight between the takeoff (liftoff) point and the destination (Figure 2-2). This applies to both Modes 1 and 2.

## Flight Monitoring And Landing Zone Approach

2-61. Enemy presence keeps the pathfinders from using nondirectional beacons. However, for pilots to approach and land on the LZ visually, they need good visibility. Using radio homing signals for directional guidance presents a dubious option. Whether or not aircraft trafficmanagement personnel decide to use this electronic device, they should try to orient its signal away from the FEBA. This reduces the chance of detection.

## Chapter 3 Air Traffic Control

This chapter discusses the pathfinder air traffic controller, not the regular air traffic controller. The latter has radar and other sophisticated tools to monitor weather and guide aircraft. The pathfinder has only his training, so he can only advise and inform the pilot. Based on what the pathfinder tells him and on his own observations, the pilot must then decide whether to land, take off, or drop equipment or personnel.

Unless clearly stated otherwise, "air traffic controller" refers to the *pathfinder* air traffic controller. This chapter also includes other terms peculiar to air traffic control (ATC) tasks.

## Section I. Pathfinder Air Traffic

The pathfinder air traffic controller uses radio or directional light signals to provide flight information, expedite traffic, and prevent collisions.

## Safety

3-1.

Pathfinders issue specific commands regulating vehicles, equipment, or personnel in the movement area. They help with searchand-rescue operations (STANAGs 2863 and 3281). They also promote the safe, efficient flow of air traffic by issuing clearances, instructions, and information. 3-2. Pathfinders survey all visible air traffic operating within and around the airspace of the LZ, DZ, or airfield. They also bear the responsibility for all aircraft, vehicles, and personnel in the movement area of the LZ, DZ, or airfield. 3-3. Pathfinders acting as air traffic controllers provide control service by observing or knowing of traffic and airfield conditions that might constitute a hazard. These include

-  Surface conditions. -  Parachutists within control zones.
-  Vehicular traffic.
-  Temporary obstructions on or near the LZ, DZ, or airfield. -  Other aircraft. -  Enemy or friendly activities.
3-4. Because of their communication capability and expertise, pathfinders might have to transmit medical evacuation (MEDEVAC) requests for the ground unit, the aviation unit, or even themselves. Therefore, they must be thoroughly familiar with request procedures and the capabilities of MEDEVAC aircraft.

## Voice Control

3-5. To communicate vocally, pathfinders and pilots must speak clearly and listen to each other. A clear, decisive tone of voice indicates control of the situation. Pilots might mistrust instructions delivered in a vague or hesitant voice. To ensure that traffic flows safely and smoothly, the pathfinder must speak firmly and confidently, using standard words and phrases. Pathfinders use the phonetic alphabet to indicate single letters or initials, or to spell words, whenever similar sounds or difficulties in communication require them to do so. 3-6. Voice transmission offers a brief, concise, uniform flow of communication. The pathfinder controller must speak distinctly and pay special attention to numbers. When the accuracy of a message is doubtful, he repeats the complete message or essential parts. Radio operators use the following techniques to ensure clear understanding:

-  Speak directly into the microphone. -  Speak in a normal, conversational tone. -  Vary your pitchavoid speaking in a monotone. -  Speak at a comfortable speedavoid speaking too slow or too fast. -  Keep your tone clear, professional, and firm. Avoid showing fear,
indecision, anger, or other negative emotions in your tone of voice.
-  Speak with confidence, especially in emergencies.
3-7. The pathfinder ATC must transmit messages only as necessary for control or to help ensure safety. Specific procedures and control techniques vary, but the following rules apply regardless of the techniques used:

-  The pathfinder issues instructions and information about all known
traffic conditions.
-  The pilot uses at lease one component of a standard traffic pattern
(final approach), consistent with the pathfinder's instructions.
-  The pilot has the final authority about whether to accept clearances
issued by a controller.

## Formats

3-8. A pathfinder controller uses the following formats and sequences for ground-to-air radio communication:

-  To initially call up an aircraft, he--
  Identifies the aircraft he wishes to call.   Says, "THIS IS."   Identifies the calling unit.   Identifies the type of message to follow (when this will help the
pilot).
  Says, "OVER."
Example: TANGO TWO SIERRA TWO SIX (T2S26), THIS IS
CHARLIE THREE DELTA THREE SIX (C3D36) (short pause), OVER.

-  To reply to an aircraft's initial call-up, he--
  Identifies the aircraft initiating the call-up.   Says, "THIS IS."   Identifies the pathfinder control unit.   Says, "OVER." After establishing communications with an
aircraft, shortens the transmission by using only the last three numbers (or letters) of each party's (his and the aircraft's) identification.
Example: SIERRA TWO SIX, THIS IS DELTA THREE SIX, OVER.

3-9. The controller always starts a clearance (instruction) intended for a specific aircraft by identifying that aircraft. If he thinks that using the shortened identification could cause or is causing confusion, he can go back to using the full identification.

Example: SIERRA TWO SIX, WIND CALM, CLEAR TO LAND, OVER.

3-10. The controller can omit "THIS IS" from the reply.
Example: SIERRA TWO SIX, DELTA THREE SIX, OVER.

3-11. The controller can omit the facility identification.
Example: SIERRA TWO SIX, TURN TO HEADING ZERO FOUR
FIVE, OVER.

3-12. Right after call-up, without waiting for the aircraft to reply, the controller can send a short message that he expects the aircraft to receive.

## Example: Sierra Two Six, Extend Downwind, Over.

3-13. If the message obviously requires a reply, he can omit "OVER."

## Example: Sierra Two Six, What Is Your Location?

3-14. To distinguish between similar aircraft identifications, he might emphasize appropriate numbers, letters, or words. The controller never transmits to an aircraft during the final approach, touchdown, landing roll (touchdown), takeoff (liftoff), initial climb, or turnaway from the field. At these times, the pilot must concentrate on flying the aircraft. However, he transmits at once any condition or information that could affect the safety of the aircraft. Under no circumstances does the controller withhold from the pilot of an approaching aircraft any information about hazardous runways, fields, weather, or traffic conditions.

## Numbers

3-15. A pathfinder controller transmits numbers by units or digits (Table 3-1).

| To Transmit                                       | Say                                           |
|---------------------------------------------------|-----------------------------------------------|
| "CEILING FIVE HUNDRED" (one unit) or "CEILING     |                                               |
| FIVE-ZERO-ZERO" (digits for emphasis).            |                                               |
| CEILING                                           |                                               |
| HEIGHTS and                                       |                                               |
| FLIGHT                                            |                                               |
| ALTITUDES                                         |                                               |
| "ALTITUDE ONE THOUSAND THREE HUNDRED"             |                                               |
| (two units) or "ALTITUDE ONE-THREE-ZERO-ZERO"     |                                               |
| (in digits).                                      |                                               |
| TIME                                              | Use the word TIME followed by the number. For |
| example, "0115 HOURS TIME, ZERO-ONE-ONE-          |                                               |
| FIVE" or "1315 HOURS TIME, ONE-THREE-ONE-         |                                               |
| FIVE."                                            |                                               |
| ELEVATION                                         |                                               |
| NUMBERS                                           |                                               |
| Use the words FIELD ELEVATION and the number.     |                                               |
| For example, for a 17-foot elevation, say, "FIELD |                                               |
| ELEVATION SEVENTEEN." For a 50-foot elevation,    |                                               |
| say, "FIELD ELEVATION FIFTY."                     |                                               |
| WIND SPEED                                       | Use the word WIND followed by compass direction   |
|--------------------------------------------------|---------------------------------------------------|
| and velocity (knots). For example, "WIND TWO-    |                                                   |
| SEVEN-ZERO AT FIVE."                             |                                                   |
| HEADING                                          | Use the word HEADING followed by compass          |
| numbers (degrees); omit the word DEGREES. For    |                                                   |
| example, "HEADING ONE TWO ZERO," "HEADING        |                                                   |
| ZERO-ZERO-FIVE," or "HEADING THREE-SIX-          |                                                   |
| ZERO." (The latter indicates a North [direction] |                                                   |
| heading.)                                        |                                                   |

## Phrases And Terms

3-16. A pathfinder controller uses particular phrases (Table 3-2) and terms (Table 3-3) to control and communicate with aircraft. He must know these phrases and how to use them.

| Intent                              | Example                        |
|-------------------------------------|--------------------------------|
| Issue takeoff, liftoff, or          |                                |
| departure clearance when            |                                |
| delay is undesirable.               |                                |
| SIERRA TWO SIX, CLEARED FOR         |                                |
| IMMEDIATE TAKEOFF (or               |                                |
| DEPARTURE), OVER.                   |                                |
| Issue takeoff (liftoff) clearance   |                                |
| when aircraft is delaying on        |                                |
| the runway.                         |                                |
| SIERRA TWO SIX, TAKE OFF (or        |                                |
| DEPART) IMMEDIATELY OR TAXI OFF     |                                |
| THE RUNWAY, OVER.                   |                                |
| Authorize a requested               |                                |
| straight-in approach after          |                                |
| issuing landing instructions.       |                                |
| SIERRA TWO SIX, STRAIGHT-IN         |                                |
| APPROACH (to landing strip or LZ)   |                                |
| APPROVED, OVER.                     |                                |
| Authorize a right-hand traffic      |                                |
| pattern.                            |                                |
| SIERRA TWO SIX, RIGHT TRAFFIC       |                                |
| APPROVED, OVER.                     |                                |
| Issue the landing sequence.         | SIERRA TWO SIX, YOU ARE NUMBER |
| THREE TO LAND; FOLLOW THREE         |                                |
| EIGHT FIVE (aircraft identification |                                |
| number) ON DOWNWIND, OVER.          |                                |
| Instruct pilot to extend            |                                |
| downwind leg to obtain              |                                |
| necessary aircraft separation.      |                                |
| SIERRA TWO SIX, EXTEND              |                                |
| DOWNWIND FOR TRAFFIC SPACING,       |                                |
| OVER.                               |                                |
| SIERRA TWO SIX, BE ADVISED WE       |                                |
| ARE RECEIVING AUTOMATIC FIRE        |                                |
| FROM THE EAST, OVER.                |                                |
| Advise pilot of information not     |                                |
| included in landing                 |                                |
| instructions, but important to      |                                |
| aircraft safety.                    |                                |
UNIFORM HOTEL ONE, TWO MILES WEST OF BLUE STRIP, STATE CALL SIGN, OVER.
Try to establish communication with and learn the identification of an aircraft in the area. Instruct pilot to circle the LZ or landing strip.
SIERRA TWO SIX, MAINTAIN LEFT (RIGHT) CLOSED TRAFFIC, OVER.
Issue clearance to land.
SIERRA TWO SIX, CLEAR TO LAND, OVER. SIERRA TWO SIX, CONDUCT GO- AROUND, OVER.
Instruct a pilot on his final landing approach that his clearance to land has been cancelled. Inform pilot to continue his approach to the landing area.
SIERRA TWO SIX, CONTINUE APPROACH, OVER.
Inform pilot of observed aircraft condition upon request or when necessary.
SIERRA TWO SIX, LANDING GEAR APPEARS DOWN AND IN PLACE, OVER. SIERRA TWO SIX, AIRCRAFT TO LEFT OF RUNWAY, OVER. SIERRA TWO SIX, VEHICLES ON TAXIWAY, OVER.

Describe vehicles, equipment, or personnel in the movement area in a way that will help pilots see or recognize them.

Describe military traffic as appropriate.
SIERRA TWO SIX, BE ADVISED HELICOPTER ON DEPARTURE END, OVER. SIERRA TWO SIX, BE ADVISED, CHARLIE HOTEL FOUR SEVEN (CH-47) ON RIGHT SIDE OF RUNWAY, OVER. SIERRA TWO SIX, UNIFORM SIX, YOUR THREE O'CLOCK, FIVE HUNDRED METERS, OVER.

Describe the relative positions of traffic using the clock direction-and-distance method.

| Term                                      | Meaning                                          |
|-------------------------------------------|--------------------------------------------------|
| ABORT                                     | Do not complete landing or takeoff (liftoff).    |
| ACKNOWLEDGE                               | Did you receive and understand the message?      |
| AFFIRMATIVE                               | Yes.                                             |
| BE ADVISED                                | Indicates additional information is forthcoming, |
| such as an unusual condition or hazard to |                                                  |
| flight.                                   |                                                  |
| BREAK                                               | That is the end of my transmission to you. The   |
|-----------------------------------------------------|--------------------------------------------------|
| following message is for another aircraft. OR,      |                                                  |
| that is the end of this part of the message. The    |                                                  |
| next portion follows.                               |                                                  |
| CONDUCT GO-                                         |                                                  |
| AROUND                                              |                                                  |
| Do not land. Circle the landing area, and begin     |                                                  |
| another approach.                                   |                                                  |
| CORRECTION                                          | I gave you some incorrect information. The       |
| correct information follows.                        |                                                  |
| EXECUTE                                             | Drop personnel or equipment.                     |
| FORM YOUR OWN                                       |                                                  |
| APPROACH.                                           |                                                  |
| You might enter the traffic pattern at your         |                                                  |
| discretion. (Most suitable for aircraft with a      |                                                  |
| slingload or for aircraft flights.)                 |                                                  |
| GO AHEAD                                            | Proceed with your message.                       |
| I SAY AGAIN                                         | I am about to repeat my previous message.        |
| LAST CALLING                                        |                                                  |
| STATION                                             |                                                  |
| I do not know the identity of the station trying to |                                                  |
| establish communication.                            |                                                  |
| MAYDAY                                              | This is an emergencyclear the airways.          |
| NEGATIVE                                            | No.                                              |
| NO DROP                                             | Do not drop personnel or equipment.              |
| OUT                                                 | That is the end of my transmission; you need     |
| not respond.                                        |                                                  |
| OVER                                                | That is the end of my transmission; please       |
| respond.                                            |                                                  |
| READ BACK                                           | Repeat message.                                  |
| REPORT                                              | Contact the control facility when you reach the  |
| location (or distance from the control station)     |                                                  |
| that I am about to designate.                       |                                                  |
| ROGER                                               | I received and understand your transmission.     |
| SAY AGAIN                                           | Repeat your message.                             |
| STAND BY                                            | Pause for a few seconds. OR, prepare to drop     |
| personnel or equipment.                             |                                                  |
| STATE CALL SIGN                                     | Identify your aircraft.                          |
| STATE INTENTIONS                                    | Tell me your plans.                              |
| STATE LOCATION                                      | Tell me your exact location.                     |
| UNABLE TO APPROVE                                   | I must refuse your request.                      |
| VERIFY                                              | Check with the originator.                       |
| WILCO                                               | I understand and will comply.                    |

WORDS TWICE
Communication is difficult; transmit each phrase twice. I do not understand the transmission.

YOU ARE
UNREADABLE
(BROKEN OR
GARBLED)

## Section Ii. Landings

The safe landing of aircraft requires control of the airspace and grounds around the site. Managing air traffic involves using traffic patterns and maintaining separation of aircraft.

## Traffic Patterns

3-17. The pathfinder uses a traffic pattern to help manage airspace over his location, that is, in and around a landing site, airfield, LZ, or DZ (Figure 3-1). A traffic pattern normally extends out 1 statute mile from the final approach of the landing area in all directions, depending on the type of aircraft or size of the facility. 3-18. In a normal (left) traffic pattern, the aircraft makes only left turns. The pilot keeps the airfield, landing site, LZ, or DZ to his left. In a right traffic pattern, the aircraft makes all right turns. The pilot keeps everything to his right. 3-19. The controller uses traffic patterns to manage aircraft separation around a no-threat landing site. Rotary-wing aircraft can enter the pattern from any direction as long as they meet safety requirements. The height of the obstacles or aircraft requirements determines the altitude, which the controller can adjust as needed. 3-20. While in the traffic pattern, the aircraft flies between 1,000 and
1,200 feet (known as *civil altitude*), though this might vary depending on the nature and requirements of the mission.

## Methods Of Entry

3-21. An aircraft might enter the traffic pattern from any point and direction within the area around the landing strip or zone, consistent with safety requirements. 3-22. Fixed wing aircraft normally enter the traffic pattern in the first one-third of the closest leg, at a 45-degree angle or less. Rotary wing aircraft might enter at any point in a leg, normally at a 45-degree angle or less. 3-23. A straight-in approach might work best if it falls within safety requirements. On a straight-in approach, the aircraft must remain within 30 degrees to either side of the land heading. 3-24. When circling to approach from any direction, the aircraft overflies the landing site then circles to the direction of landing. Normally, the pathfinder advises the pilot which direction to circle. This saves time and helps the aircraft avoid other traffic in the same airspace. The pathfinder most often encounters this type approach. 3-25. Departing aircraft normally leave on the same heading as landing aircraft, or as close to the same heading as they can, up to 45 degrees left or right of the land heading, depending on the wind direction. When the destination does not fall in the same direction as the departure, the aircraft might fly a portion of the traffic pattern. The pathfinder ensures that arriving and departing traffic do not conflict.

3-26. The controller commands GO-AROUND if for some reason the aircraft does not land after the pilot reaches the final approach leg of the traffic pattern. 3-27. The pathfinder uses closed traffic in either of two cases:

-  When an aircraft fails to land on the first approach. -  During DZ operations, when an aircraft must make more than one
pass over the DZ.

## Traffic Pattern Legs

3-28. The traffic pattern has five possible legs. The pathfinder does not use them all at once. The pilot must at least fly the final approach leg, regardless of the type of approach (Table 3-4).

| UPWIND                               | Parallel to land   |
|--------------------------------------|--------------------|
| heading                              |                    |
| Landing direction                    |                    |
| CROSSWIND                            | Right angle to     |
| land heading                         |                    |
| Landing direction                    |                    |
| DOWNWIND                             | Parallel to land   |
| heading                              |                    |
| Direction opposite of landing        |                    |
| direction                            |                    |
| BASE                                 | Right angle to     |
| landing runway                       |                    |
| Extends from downwind leg to         |                    |
| intersection of runway centerline    |                    |
| (extended)                           |                    |
| FINAL                                |                    |
| (APPROACH)                           |                    |
| Along runway                         |                    |
| centerline                           |                    |
| Landing direction; extends from base |                    |
| leg down to the runway               |                    |

## Advisory Service

3-29. The pathfinder controller issues advisories for the safe operation of aircraft in his area of responsibility. He might include such information as the temporary or permanent conditions on the landing field.

3-30. Temporary conditions can include
-  Construction work on or immediately next to the movement area. -  Rough portions of the movement area. -  Degraded runway braking conditions due to ice, snow, mud, slush,
or water.
-  Parked aircraft on the movement area.
3-31. Permanent conditions can include
-  Excessive slope. -  Obstacles 18 inches high, wide, or deep on the HLZ. -  Elevation.
3-32. No two landing areas and situations are the same. Each location presents its own problems with respect to environmental conditions, peculiar weather, preferred landing directions, and so forth. For example

-  The final approach to a particular runway or HLZ might require a
higher-than-normal glide slope angle.
-  Under certain wind conditions, unusual terrain features near the
airfield or HLZ can cause turbulence. This could threaten nearby aircraft. Helicopters also can create turbulence that could result in harm to light aircraft.
-  Prohibited areas, trees, mountains, or other obstacles and hazards
directly in line with the end of the runway or around the HLZ can
require the pilot to turn or maneuver the aircraft abruptly right
after takeoff (liftoff).
-  If friendly forces fire either artillery or mortars within the control
zone, the pathfinder might need to tell the pilot the origin, range, direction, and maximum ordinate of the firing. He also tells the pilot about any air strikes in the control zone, especially those by high-performance aircraft. He also gives the pilot any available information about the enemy situation.

## Spacing Techniques

3-33. Spacing provides more separation between aircraft in the traffic pattern. This relieves traffic congestion. The pathfinder controller uses two methods to obtain the required separation: the 360-degree turnout and the traffic pattern extension.

## 360-Degree Turnout

3-34. Except on the final approach, the pathfinder can issue instructions for the 360-degree turnout (a two-minute maneuver) at any point in the traffic pattern. When a pilot receives instructions to begin a 360-degree turnout, he turns away from the center of the landing site, makes a wide circle, and reenters the traffic pattern at about the same point where he left it (Figure 3-2 and Table 3-5). If the first turnout does not give him enough room, he might have to make more turnouts.

Pathfinder: DELTA THREE SIX, BEGIN THREE SIX
ZERO DEGREE TURNOUT FOR SPACING, AND REPORT REENTRY.

Pilot:
ROGER. (After completing turnout) LIMA ONE SIX, DELTA THREE SIX HAS REENTERED.

Pathfinder: DELTA THREE SIX, ROGER, REPORT
BASE.

Pilot:
ROGER.
| Situation              | Reporting Point   |
|------------------------|-------------------|
| AIRCRAFT IN TRAFFIC    | BASE LEG OF       |
| TRAFFIC PATTERN        |                   |
| STRAIGHT-IN APPROACH   | FINAL             |
| AIRCRAFT AUTHORIZED TO |                   |
| FORM OWN APPROACH      |                   |
| FINAL                  |                   |

## Three Legs Of Traffic Pattern

3-35. The pathfinder can only extend the traffic pattern on three legs: upwind, crosswind, and downwind (Figure 3-3). He can only extend one leg at a time. He cannot extend the base leg or the final approach, because they run back into the traffic pattern itself. When giving instructions to extend the traffic pattern, the pathfinder includes the length of the extension. The extension normally measures twice the original length of that leg (1 statute mile). The pathfinder takes care to ensure that he does not extend the leg so far that he loses visual contact with the aircraft.

## Final Landing Instructions

3-36. Final landing instructions consist of a current wind reading (direction and velocity) and clearance to land. The pathfinder includes any change to the situation in the final landing instructions, which he issues as soon as the pilot reports from the designated point. As a rule, once the pathfinder clears an aircraft to land, he can only rescind that clearance in extreme situations. 3-37. The best reporting points vary with the situation. 3-38. Aircraft flying in formation, except those flying in trail, and aircraft with a slingload, usually form their own approach. 3-39. If two or more missions arrive at the same time, the controller gives first landing priority to in-flight emergencies, followed by MEDEVAC aircraft. His next priority is coded aircraft, multiple aircraft in formation, and aircraft with slingloads. His last priority is single aircraft.

## Taxiing Aircraft

3-40. When issuing taxiing instructions, the pathfinder includes a route for the aircraft to follow in the movement area. He also includes instructions for the pilot to hold the aircraft at a specific point, if needed. The pilot moves the aircraft in the loading, maintenance, dispersal, or parking areas without the pathfinder's help but sometimes aided by signalmen. The controller holds a taxiing aircraft short of an active runway by at least two airplane lengths. This ensures that landing aircraft have sufficient clearance. The controller issues concise, easy-tounderstand information.

Example: SIERRA TWO SIX, TURN RIGHT AT SIGNALMAN.

TANGO THREE SIX, TURN LEFT AT END OF RUNWAY, OVER.

## Minimum Aircraft Separation Requirements

3-41. During normal operations, pathfinders ensure pilots follow minimum separation criteria. Combat situations might dictate less separation (Figure 3-4).

## Arriving Aircraft

3-42. The preceding aircraft (1) taxis off the landing strip before the arriving aircraft (2) crosses the approach end on its final glide (A, Figure
3-4).

## Departing Aircraft

3-43. The preceding aircraft either crosses (1) the opposite end of the runway or turns away from the projected path of the departing aircraft (2) before the latter begins its takeoff run (B, Figure 3-4).

## Departing And Arriving Aircraft

3-44. The departing aircraft (1) crosses the opposite end of the runway before the arriving aircraft (2) crosses the approach end on its final glide path (C, Figure 3-4).

## Departing, Preceding, And Arriving Aircraft

3-45. The preceding aircraft (1) and the arriving aircraft (2) both taxi off the runway before the departing aircraft (3) begins the takeoff run (D, Figure 3-4).

## Danger

Arriving and departing aircraft with slingloaded cargo must *never* fly over personnel, equipment, or other aircraft.

## Section Iii. Ground-To-Air Communications

Air traffic control requires a rapid and efficient means of communication between aircraft and ground stations. Two-way radio offers the most efficient means because it allows clear and rapid exchange of information. Not all aircraft have radios that work. A system of visual signals serves as a backup or standby means of communication when the control center or aircraft radio does not work, or if the aircraft does not have the control frequency (Table 3-6). Pathfinders might also use colored smoke signals but must coordinate with the aviation unit so that the pilots will know what each color means.

## Electronic Warfare Environment

3-46. The pathfinder should expect an active EW environment for all operations. He should make sure he knows the proper ECCM. These include prowords that signal a switch to an alternate radio frequency, transmission authentication procedures, brevity codes, and required reports when he suspects enemy interference. The pathfinder uses proper communications procedures and signal operating instructions (SOI) during all operations. 3-47. To limit the possibility of compromise, the pathfinder reduces the electronic signature at the LZ or DZ. For this, he depends on thorough mission planning and coordination. He plans control procedures that enable him to execute the mission under radio listening silence. All pathfinder missions seek to achieve this goal. 3-48. Sometimes, the pathfinder has little time to plan the mission. At other times, tactical or meteorological conditions can affect the operation. In either case, the pathfinder might have to use GTA communications to resolve possible conflicts between friendly airspace users and to advise them of previously-unknown restrictive landing conditions. These conditions could include wind gusts, hazardous slopes, obstacles, soft landing surfaces, or a limited number of landing points. Training and close liaison with aviation aircrews enable the pathfinder to develop an understanding of what information pertains to the situation. This reduces transmission time. 3-49. The pathfinder manages any variation due to unknown influences just as he would manage any other exception to set procedure. The landing site is the variable most subject to change. Many conditions could require its relocation. For example, ground fog could cause a delay while the pathfinders move the site to a higher elevation. 3-50. Before they know whether a site will support sufficient landing points or an assembly area for the ground unit, the pathfinders must first secure the site, and then conduct air and ground reconnaissance and surveillance. 3-51. If the mission is to reinforce or resupply a ground unit in contact, a change in the tactical situation could render the proposed location unsuitable. If the pathfinders locate the proposed site near enemy activity, they will most likely have to move it sometime between planning and execution to ensure that it continues to meet mission requirements. 3-52. Maintaining radio silence within the LZ is important. Because of this, most air movements require the establishment of a CCP. This ensures a common point where the pathfinders and the aircraft can refer their relative positions and give each other time to adjust to other changes. 3-53. The GTA net is reserved for communications, but the pathfinder cannot assume that all transmissions originate from aircraft. The headquarters in charge of flight plans logs all arrivals. They will know if an aircraft fails to arrive at its destination on time. When this happens, they contact intermediate stop points to identify the last known location, and to aid in search-and-rescue operations.

Color And Type of Signal Lights
What This Means to an Aircraft in Flight
What This Means to an Aircraft on the Ground
Steady green
Cleared for takeoff (or liftoff)
Cleared to land
Flashing green
Cleared to taxi
Return for landing (followed
by a steady green light at the proper time)
Steady red
Stop
Give way to other aircraft and continue circling Airport unsafedo not land
Flashing red
Taxi clear of landing area of runway in use
Flashing white
Return to starting point (on airfield)
NA
Use extreme caution
Use extreme caution
Alternating red and green (general warning signal) Red pyrotechnic (red flare)
NA
Do not land for the time being, despite previous instructions.

## Ground-To-Air Transmissions

3-54. The pathfinder might encounter endless situations while using GTA. If he can master the following four most common ones, he can handle most situations:

## Situation 1, Known Aircraft Location

3-55. Known aircraft location is the simplest of the GTA transmissions.

## Initial Contact

3-56. The pilot radios transmissions at coordinated time and location. After establishing two-way communications, the controller can abbreviate call signs. With multiple flights, instructions issued by pathfinder GTA communications should identify the particular situation by including that station's call sign at the beginning of the transmission, for example--

Pilot:
ALPHA ONE LIMA ONE SIX (A1L16), THIS IS ROMEO TWO BRAVO TWO SEVEN (R2B27), OVER.

Pathfinder: ROMEO TWO BRAVO TWO SEVEN, THIS IS
ALPHA ONE LIMA ONE SIX, OVER.
Pilot:
THIS IS BRAVO TWO SEVEN, CCP
INBOUND, OVER.
Pathfinder: THIS IS LIMA ONE SIX, STATE TYPE,
NUMBER, AND INTENTIONS, OVER.
Pilot:
THIS IS BRAVO TWO SEVEN, FOUR UNIFORM HOTEL SIXTIES (UH-60s), TROOP DROP-OFF AND SLINGLOAD, FOR YOUR SITE, OVER.
Pathfinder: THIS IS LIMA ONE SIX, ROGER, HEADING
THREE-TWO-FIVE (325), THREE THOUSAND (3,000) METERS. LAND THREE TWO FIVE, SIGNAL ON CALL, LAND ECHELON RIGHT, SLINGLOAD AIRCRAFT USE NUMBER FOUR LANDING POINT, CONTINUE APPROACH FOR VISUAL CONTACT, OVER.

## Air Traffic Control Information

3-57. An example of what the air traffic controller might say follows:

Example: HEADING THREE TWO FIVE, (distance)
THREE THOUSAND METERS, OVER. LAND THREE TWO FIVE, OVER.

## Pertinent Information

3-58. The air traffic controller also gives any other pertinent information, for example--

Example:
SIGNAL ON CALL (prepare to establish positive visual contact).
FOUR UNIFORM HOTEL SIXTIES (UH-60s) IN ECHELON RIGHT (advises pilot of the size of landing site). SLINGLOAD POINT ON NUMBER FOUR TOUCHDOWN POINT (night only). FIELD ELEVATION, FOUR TWO
FIVE FEET (actual field elevation).

## Advisory Information

3-59. See Table 3-7.

| Information Included                             | Type of                                                       |
|--------------------------------------------------|---------------------------------------------------------------|
| Advisory                                         |                                                               |
| FLIGHT                                           | The enemy situation, if it presents a threat to the aircraft. |
| LANDING                                          | Surface conditions on the landing site such as the            |
| presence of sand, mud, or blowing snow.          |                                                               |
| DEPARTURE                                        | Obstacles in the path of aircraft leaving the site            |
| (obstacles above the obstacle departure lights). |                                                               |

## Aircraft In Sight

3-60. The following shows what the pilot and pathfinder say when an aircraft is in sight of the runway:

Pathfinder: BRAVO TWO SEVEN, THIS IS LIMA ONE
SIX, I AM AT YOUR TWELVE O'CLOCK, FIVE HUNDRED METERS, IDENTIFY SIGNAL, OVER.

Pilot:
THIS IS BRAVO TWO SEVEN, I IDENTIFY GREEN SMOKE, OVER.
3-61. At night, during specialized activities such as external load dropoff or pickup, or when unsafe surface conditions require pathfinders to mark specific landing points, the flight leader must know all arrangements. This allows him to organize the flight for landing. Pathfinders identify the site by flashing a visible or infrared light source in a dot-dash sequence.

Pathfinder: THIS IS LIMA ONE SIX, VISUAL CONTACT
(and, once the pilot identifies the site), WIND THREE TWO FIVE AT EIGHT, CLEAR TO LAND, OVER.
3-62. Once the pilot identifies the site, the pathfinder issues final landing instructions. If the controller already has other aircraft flying in a traffic pattern, he places the incoming aircraft into the traffic pattern at a safe and convenient location. Then, he instructs the pilot to report base. When the pilot reports base, the pathfinder issues final landing instructions. For special situations, instead of placing the aircraft in the traffic pattern, the controller might tell the pilot to circle left or right. Then the controller will issue final landing instructions.

## Departure Instructions

3-63. If the departure heading differs from the land heading, the controller gives the departure heading as the first element of the departure instructions.

Pilot:
LIMA ONE SIX, THIS IS BRAVO TWO SEVEN, READY FOR DEPARTURE, OVER.
Pathfinder: THIS IS LIMA ONE SIX, WIND THREE TWO
FIVE AT EIGHT, CLEAR TO DEPART, STATE INTENTIONS, REPORT CLEAR OF LANDING ZONE, OVER.
Pilot:
THIS IS BRAVO TWO SEVEN, RIGHT BREAK, AFTER DEPARTURE, OVER.
Pathfinder: THIS IS LIMA ONE SIX, ROGER, OVER.
Pilot:
THIS IS BRAVO TWO SEVEN, CLEAR TO
THE WEST, OVER.
Pathfinder: THIS IS ALPHA ONE LIMA ONE SIX,
ROGER, OUT.

## Situation 2, Aircraft Reporting From A Cardinal Direction And Distance

3-64. Often, units conduct mutually-supporting helicopter operations to increase the security of an LZ operation. For example, a team of observation and attack helicopters might screen the LZ 3-65. Because no aircraft plan to land there, and because the utility or lift aircraft know the LZ
and screen team's location from communications over internal UHF or VHF radio nets, the screening helicopters need not contact the pathfinder. However, if they learn an aircraft does need to land at the LZ, the screening helicopter team responds differently to initial contact. 3-66. Due to a possible conflict with aircraft departing the landing site in the same direction, the pathfinder must track the inbound aircraft's course and advise mission aircraft of the unexpected arrival. To accurately track the aircraft and control the situation, the pathfinder uses a commonly known point in the direction of the aircraft. He can use a prominent terrain feature, a checkpoint, or an aerial control point previously established by the ground unit for maneuver control. This situation matches Situation 1 exactly, except that the controller does not give the aircraft's heading and distance.

## Situation 3, Aircraft With In-Flight Emergency

3-67. An in-flight emergency occurs when an aircraft develops a mechanical problem that challenges the pilot's ability to maintain control. Because the pilot must focus on the problem with the aircraft, the pathfinder helps by moving other air traffic away from the one having the problem, which has first priority. If the emergency develops before initial contact, OPSEC requires a full information exchange, just like in a standard transmission. After the pilot declares the emergency, the situation continues as follows:

Pilot:
ALPHA ONE LIMA ONE SIX (A1L16), THIS IS CHARLIE ZERO WHISKEY ZERO TWO (C0W02), IN-FLIGHT EMERGENCY (MAYDAY), OVER.
Pathfinder: THIS IS LIMA ONE SIX, WIND ZERO THREE
FIVE AT SIX, CLEAR TO LAND, STATE
INBOUND HEADING, OVER.
Pilot:
THIS IS WHISKEY ZERO TWO, HEADING TWO SIX ZERO, OVER.

Pathfinder: ALL STATIONS, THIS IS ALPHA ONE LIMA
          ONE SIX, BE ADVISED, IN-FLIGHT
          EMERGENCY APPROACHING FROM THE
          EAST, REMAIN CLEAR OF LANDING SITE
          AND MAINTAIN RADIO SILENCE UNTIL
          EMERGENCY HAS BEEN TERMINATED -
          BREAK - WHISKEY ZERO TWO, CAN I BE
          OF FURTHER ASSISTANCE, OVER.

Pilot:
              THIS IS WHISKEY ZERO TWO, NEGATIVE,
              OVER.

Pathfinder: THIS IS LIMA ONE SIX, ROGER, OVER.

3-68. The controller tells the emergency aircraft of any aircraft that remain on the landing site.

Pathfinder: WHISKEY ZERO TWO, BE ADVISED, TWO
UNIFORM HOTEL ONES ON NORTH END OF SITE.

3-69. Only the pilot who originally declared the emergency can terminate that same emergency. Once the pilot does so, the pathfinder transmits a net call to inform all stations that normal operations can continue.

Pathfinder: ALL STATIONS, THIS IS ALPHA ONE LIMA
ONE SIX, EMERGENCY HAS TERMINATED, I CAN ACCEPT TRAFFIC, OVER.

3-70. Departure instructions are the same as those given for Situation 1.

## Situation 4, Disoriented Aircraft

3-71. During limited visibility, adverse weather, in-flight emergencies or, when he has no map, a pilot might not know the location of the LZ. Also, he might not see any easily-identifiable land point. 3-72. In such cases, the pathfinder can help the pilot by directing him either to a known location or to the LZ. At terrain flight altitudes, and in some environments, the pilot might experience disorientation of as little as 200 meters. The pathfinder might hear but not see the aircraft. Pilots who have FM homing equipment onboard might use that to orient themselves during the initial contact, without having to ask for a long or short count. Because it requires the ground station to increase transmissions, FM homing risks loss of signal security (SIGSEC). 3-73. In this example, an aircraft at the CCP cannot establish voice communication with the pathfinder due to low altitude or radio interference. Knowing the LZ location, but unsure of the exact location of the landing site, the pilot continues his flight closer to the center of the zone.

Pilot:
ALPHA ONE LIMA ONE SIX (A1L16), THIS IS CHARLIE TWO ECHO THREE FOUR (C2E34), OVER.
Pathfinder: CHARLIE TWO ECHO THREE FOUR, THIS
IS ALPHA ONE LIMA ONE SIX, OVER.
Pilot:
THIS IS ECHO THREE FOUR, FOUR UNIFORM HOTEL ONES (UH-1s) ARE INBOUND FOR LANDING, REQUEST NAVIGATIONAL ASSISTANCE, OVER.
Pathfinder: THIS IS LIMA ONE SIX, DO YOU HAVE FM
HOMING CAPABILITY? Pilot: THIS IS ECHO
THREE FOUR, AFFIRMATIVE, OVER.
Pathfinder: THIS IS LIMA ONE SIX, SHORT COUNT
FOLLOWS: 1-2-3-4-5-5-4-3-2-1. END SHORT COUNT, STATE INBOUND HEADING, OVER.
Pilot:
THIS IS ECHO THREE FOUR, SAY AGAIN, OVER.
Pathfinder: THIS IS LIMA ONE SIX, ROGER, ORBIT
PRESENT LOCATION, DESCRIBE PROMINENT TERRAIN FEATURES, STATE LAST KNOWN LOCATION, HEADING, AND DISTANCE FLOWN, OVER.
Pilot:
THIS IS ECHO THREE FOUR, CCP HEADING THREE SIX ZERO, TWO THOUSAND METERS, I SEE A THREE- ACRE POND WITH DAM ON THE SOUTH, ORIENTED EAST-WEST, OVER.
Pathfinder: (Plots the course correction and continues with
the standard transmission.) THIS IS LIMA ONE SIX, HEADING TWO NINE ZERO, EIGHT HUNDRED METERS, (gives advisories
if any), OVER.
3-74. The standard ATC information continues as in Situation 1 and ends with
Pathfinder: DESCRIBE PROMINENT TERRAIN
FEATURES EN ROUTE, OVER.

## Chapter 4 Helicopter Landing Zones

Helicopter landing zones contain one or more helicopter landing sites. Each landing site has a control center and, in most cases, a manned or unmanned release point (STANAG 3619). Each landing site might have one or more specific landing points for individual aircraft to touch down.

## Section I. Selection Of Landing Sites

The ground unit commander coordinates with the supporting aviation unit to select helicopter landing zones that can support the ground tactical plan.

## Considerations

4-1. Tactical considerations are those that pertain to the actual mission of the supported ground unit. These considerations are the responsibility of the ground unit commander and staff. The pathfinder must understand the ground tactical plan to best support the ground unit and facilitate mission accomplishment.

## Tactical Considerations

4-2. These include
-  An estimate of the situation based on METT-TC. -  The location of the objective in relation to the tentative HLZ. -  The size and type of unit being supported.

## Technical Considerations

4-3. These pertain to the technical aspect of the operation of a day or night HLZ. These are the responsibility of the pathfinder. The minimum landing space requirements and minimum distance between helicopters on the ground depend on many factors. If the aviation unit SOP fails to spell out these requirements, the aviation unit commander works with the pathfinder leader. The final decision about minimum landing requirements rests with the aviation unit commander. In selecting helicopter-landing sites from maps, aerial photographs, and actual ground or aerial reconnaissance, the pathfinder considers the following factors (Figure 4-1, page 4-2):

## Number And Type(S) Of Helicopters

4-4. To land a large number of helicopters at the same time, the commander can provide another landing site(s) nearby or he can have the helicopters land at the same site, but in successive lifts. A larger site might also be required for cargo aircraft with external loads as compared to several utility aircraft. The required size of the site is determined by the size and number of aircraft that will be required to land at a given time. A landing point, or touchdown point (TDP), is the specific point on the ground for a specific aircraft. The size of the landing point is determined by the aviation unit commander and is based on

-  Pilot or unit proficiency. -  Size and type of aircraft. -  Atmospheric conditions. -  Visibility (day/night). -  Type of mission (insertion, extraction, resupply, slingload drop-off,
forward area arming and refuel point [FAARP], and so forth).
4-5. Standard landing point uses and types of aircraft are listed in Table 4-1. Standard landing point sizes are listed in Table 4-1. 4-6. In a landing site, pathfinders measure the minimum distances between landing points, from center to center. When aircraft sizes vary, pathfinders separate landing points by the most generous measure, allowing 100 meters for size 5; 125 meters for size 6; 150 meters for size 7, measured center to center on the landing points. 4-7. The aviation unit commander, during coordination, might have authorized pathfinders to reduce the TDP by one size. Reducing TDP is a last-resort means to make an HLZ suitable to accomplish the mission. TDP sizes are reduced in a deliberate manner after careful consideration of all factors. If mixed aircraft types will use the TDP, the size should be reduced for utility (lighter) aircraft before slingload aircraft.

| Type Of Helicopter/Operation   |
|--------------------------------|
| Point                          |
| Minimum Diameter               |
| Of Landing Point               |
| Size 1                             | 80 ft (25 m)     | Light observation helicopters such as     |
|------------------------------------|------------------|-------------------------------------------|
| the OH-6 and OH-58D.               |                  |                                           |
| Size 2                             | 125 ft (35 m)    | Light utility and attack helicopters such |
| as the UH-1H, H-65, and AH-1W.     |                  |                                           |
| Size 3                             | 160 ft (50 m)    | Medium utility and attack helicopters     |
| such as the UH-60, H-2, and AH-64. |                  |                                           |
| Size 4                             | 265 ft (80 m)    | Cargo helicopters such as the CH-47,      |
| H-3 and CH-53, or with prior       |                  |                                           |
| coordination                       |                  |                                           |
| Size 5                             | 328 ft (100 m)   | Slingload helicopters and aircraft of an  |
| unknown origin.                    |                  |                                           |
| Size 6                             | 410 ft (125 m)   | Slingload long-line operations.           |
| Size 7                             | 492 ft (1,505 m) | Slingload operations with night vision    |
| goggles (NVG).                     |                  |                                           |

## Landing Formations

4-8. Helicopter pilots should try to match the landing formation to the flight formation. Pilots should have to modify their formations no more than necessary to accommodate the restrictions of a landing site (Figure 4-2, page 4-4), but it might be necessary to land in a restrictive area. TDPs are established in the same order as indicated in the formation.

## Surface Conditions

4-9. Pathfinders choose landing sites that have firm surfaces; are free of dust, sand, and debris that might create problems when disturbed by rotor wash; and are cleared of obstacles.

## Choose A Hard Surface

4-10. Pathfinders choose a landing point with a hard surface to support the weight of the aircraft to prevent helicopters from becoming mired, creating excessive dust, or blowing snow. The surface of the landing point must allow a fully-loaded helicopter to land, restart, and leave again, all without sinking into the ground. If the surface does not meet these conditions, an advisory must be given and the aircraft must either terminate at a hover or touch down while under power. If the mission is one that requires the aircraft to firmly land, such as an FAARP or unload an internal load, a new site must be selected.

## Clear To Ground Level

4-11. Pathfinders must clear the entire landing point of any loose material that the rotors could blow up. The term is "cleared to ground level." Unless a fire risk exists, they need not clear grass less than 0.3 meter (1 foot) high, as long as the field is level. They can cut down on dust by wetting down dry dirt. They can reduce snow to reveal hazards, and then pack it down firm, which will also reduce the amount blowing around. Rotor wash stirs up any loose dirt, sand (brownout), or snow (whiteout). This can obscure the ground and other aircraft, especially at night. If a site must be used with obscuring conditions, pathfinders note these conditions and provide advisories and radio guidance as required. Pathfinders also remove any debris from landing points because airborne debris could damage the rotor blades or turbine engine(s).

## Clear Around Obstacles

4-12. Ground troops must do everything they can to improve landing point surfaces so aircraft can land. In general, an obstacle is a stump, rock, hole, or other object, 18 inches or larger, that might damage the aircraft or impede aircraft landing. No obstacles can be in a TDP in which an aircraft is going to land. Note, however, that even if pathfinders cannot clear ground obstructions, they can perform some helicopter operations without the helicopter landing. They must still clear and mark the area just as they would if the helicopter were going to land. Helicopters are given an advisory and hover above the ground obstructions that prevent them from landing.

## Ground Slope

4-13. Pathfinders choose landing sites with relatively level ground. For the helicopter to land safely, the slope should not exceed 7 degrees (Figure 4-3, page 4-6). Whenever possible, pilots should land upslope rather than downslope. All helicopters can land where ground slope measures 7 degrees or less and no advisory is required. When the slope exceeds 7 degrees, observation and utility helicopters that utilize skids for landing must terminate at a hover to load or off-load personnel or supplies. When the slope measures between 7 and 15 degrees, large utility and cargo helicopters that use wheels for landing are issued an advisory, and they land upslope. When the slope exceeds 15 degrees, all helicopters must be issued an advisory and terminate at a hover to load or off-load personnel or supplies.

Note: To determine slope in percentage or degrees, express all measurements in either feet or meters, but not both. If the map sheet expresses elevation in meters, multiply by three to convert into feet. If the map sheet expresses elevation in feet, divide by three to convert to meters.

## Caution

Never land an aircraft facing downslope, if possible.

## Approach And Departure Directions

4-14. Ideally, to land or take off, especially at night, the helicopter pilot generally chooses the approach or departure path facing into the wind, over the lowest obstacle, and along the long axis of the site. The departure heading must be within 45 degrees left or right of land heading.

## Prevailing Wind

4-15. Always attempt to land a helicopter facing into the wind. Wind direction within 45 degrees left or right of land heading is considered a head wind. Depending on the helicopter's capabilities, if only one direction offers a good approach, or to make the most of available landing area, the pilot might be able to land with a crosswind of 0 to 9 knots or a tailwind of 0 to 5 knots. When wind speeds exceed 9 knots, the pilot must land into the wind. The same considerations apply to departures from landing sites. Except when the crosswind velocity exceeds 9 knots during a landing, the prevailing wind requires less attention than it does on the approach and departure routes. The wind affects smaller aircraft more than larger, more powerful ones.

## Approach And Departure Obstacle Ratio

4-16. For HLZs that are bordered on the approach and departure ends by tall obstacles such as trees, power lines, or steep mountains, planners figure on an obstacle ratio of 10 to 1. That is, if a helicopter must approach or depart directly over a 10-foot tall tree, then the landing point must have 100 feet of horizontal clearance. If they have coordinated with the aviation unit commander, qualified pathfinders might have the authority to reduce the obstacle ratio to no less than 5 to 1. Reducing obstacle ratio is a last-resort means to make an HLZ suitable to accomplish the mission, second only to reduction of TDP size. Obstacle ratios are reduced in a deliberate manner after careful consideration of all factors, and only to the minimal reduction possible. The obstacle ratio should first be reduced over the route that the helicopters will be the lightest. For example, if the mission of the aviation unit is an insertion, they will be loaded on the approach and will require the most power to ingress and land, needing the longest glide path possible. After the unloading of troops and equipment, the aircraft will be lighter and will be able to use a shorter departure route. In this case, the pathfinder would reduce the obstacle ratio on the departure end and maintain a 10 to 1 or greater ratio on the approach end (Figure 4-4).

## Night Approach

4-17. Within the night approach and exit path, the maximum obstruction angle should not exceed 4 degrees measured from the center of the landing point to a distance of 3,000 meters (9,843 feet, Figure 4-5). The maximum obstacle height at 3,000 meters is 210 meters (689
feet). The field-expedient formula is that for every meter of vertical obstacle, you must have 14 meters from the center of the landing point to the obstacle. That is, a landing point must be 280 meters from a 20- meter tree if the helicopter must approach or exit directly over the tree. Another night operation planning consideration is the helicopter approach and exit path area and the maximum obstacle height within that area. These criteria apply to both the approach path to the landing point as well as the exit path from the landing point. First, we must define the area that is the approach and exit path.

## Approach And Exit Path

4-18. The approach and exit path is a 16-degree (277 mils) sector or arc extending outward and is measured from the center of the landing point (Figure 4-6). The "V"-shaped approach and exit path is shown by the dashed and dotted line in the illustration. The 4-degree maximum obstruction angle applies to the entire area within the approach and exit path (both the dark and light shaded area) measured from the landing point center to a distance of 3,000 meters.

## Night Operations

4-19. During night operations, as the pilot gets closer to the landing point, he needs a wider area for a safe approach than just the 16-degree sector. Therefore, the minimum width of the approach and exit path, illustrated by the darker shaded area, must be equal to or wider than the width of the landing point that must be cleared to a maximum height of 2 feet (Figure 4-1). The length of the minimum width area, dimension X, will vary depending on the size of the landing point (Table 4-2). Follow along as we use a UH-60 Blackhawk as an example to help clarify the night approach and exit path criteria. Table 4-1 identified the UH-60 Blackhawk as a size 3 helicopter. Next, you must determine the landing point area that must be free from obstructions and grass cut to maximum height of 2 feet. Figure 4-2 shows 50 meters as the area needed for a size 3 landing point. Therefore, the minimum width of the night approach and exit path is 50 m. The minimum width distance intersects the 16-degree V-shaped arc (night approach and exit path) 180 meters from the center of the landing point. In other words, the night maximum obstruction angle applies to the complete approach and exit path; both the rectangular-shaped wedge (dark shaded area of the diagram) as well as the 16-degree "V"-shaped arc (light shaded area and dotted line).

Landing Point
Size
Width of Landing Point
(Meters)
Dimension X
(Meters)
1
25
90
2
35
125
3
50
180
4
80
285
5
100
355
6
125
444
7
150
533

Note: The aviation unit commander makes the final decision on minimum landing requirements. He bases his decision on the effects of air density, slope, and surface conditions. He explains these requirements verbally during early mission planning.

## Along The Long Axis

4-20. Allows the pilot a better opportunity to identify the TDP and obstacles, select the best flight path, and prevent overflying the TDP. It also allows the pathfinder to maximize the space available in the site.

## Density Altitude

4-21. Altitude, temperature, and humidity determine the density altitude. As each of these conditions increase, aircraft lift capabilities decrease. Planners should try to remember that as the density altitude increases, the size of the LZ also increases. This will also be a consideration for the aviation unit commander when determining the authority for Pathfinders to reduce TDP size or obstacle ratio.

## Loads

4-22. When fully loaded, most helicopters can neither climb nor descend vertically. They need a larger area and better approach or departure routes than when they carry lighter loads. Other load considerations are

-  Equipment or personnel. -  Internal or external load. -  Insertion or extraction mission. -  Weight.

## Obstacles

4-23. These include any obstruction that might interfere with aircraft operation on the ground. Landing zones should have no tall trees, power lines, or similar obstructions on the landing site. Pathfinders must remove or reduce any obstacles within the landing site. This includes any rocks, stumps, holes, and thick grass or brush that might hinder safe landing over 0.45 meters (18 inches). Obstacles that cannot be removed or reduced must be marked (preferably in red) and an advisory given to the pilots. Marking will be done as follows:

-  If the obstacle is on the approach route, both the near and far sides
of the obstacle will be marked.
-  If the obstacle is on the departure route, only the near side of the
obstacle will be marked.
-  If the obstacle protrudes into the LZ, but not on the flight route, the
near side of the obstacle will be marked.
-  Large obstacles on the flight route and on the LZ will be marked on
all sides of the obstacle. At a minimum, one light is required on each of the four sides.

## Alternate Sites

4-24. Enemy action, unfavorable terrain, or changes in the tactical or logistical situation can require alternate landing sites. The ground unit commander usually selects these to support the tactical plan. He (or his representative)
decides when to use them based on the recommendations of the aviation unit commander and the pathfinder on the site. The commander uses the fastest means to get instructions for using alternate sites to the pathfinders. Neither pathfinder nor aviation unit commanders can shift to an alternate LZ(s) unless the supported ground unit commander has delegated that authority to them.

## Section Ii. Organization And Duties

The commander task organizes the pathfinder element to set up and operate the installations required by the supported unit's tactical plan. They might set these up within a single LZ or separate them widely throughout a large AO. The pathfinder leader normally stays at the most important site. To set up and operate one helicopter LZ, the commander task organizes the pathfinder element into two working parties: a reconnaissance party and a marking party. Each site requires its own landing site party. The control center party and the release point party provide the same function for LZs or DZs.

## Control Center

4-25. The control center (CC) coordinates aircraft in and around an LZ or DZ and promotes a safe, orderly, and speedy flow of air traffic. Upon arrival in the area, the pathfinder leader selects the exact location of the CC. He positions it to allow visual control of aircraft in and around the LZ or DZ. 4-26. For helicopter LZs, the most desirable CC location is along the aircraft flight route, but displaced from the landing site. This helps prevent enemy EW assets from compromising the actual landing site location, even if the tactical situation dictates that the pathfinder leader remain on the site for control purposes. For an LZ with more than one landing site, or for any LZ during reduced visibility, the pathfinder leader locates the CC where it can act as a manned RP or final approach fix to provide positive navigational assistance to arriving aircraft.

4-27. The RP is an established traffic control checkpoint. It is the final navigational checkpoint for aircraft approaching the landing site or approaching air-delivery facilities in an LZ or DZ. 4-28. During the air movement phase of an air assault operation, helicopter serials also use the RP as a final coordination point for control of planned ground or aerial supporting fires in and around LZs. The air movement commander staffs the RP only when he expects tough navigational problems. He tentatively chooses its location from maps or from aerial photographic studies. He looks for an easily-identifiable point on the planned flight route to the landing site. He looks for a location that will take advantage of long-range electronic and visual navigation aids. 4-29. For single helicopter landing sites within a single LZ, the site itself offers the best location for GTA communication. Especially at night, positioning here allows the pathfinder air traffic controller to observe the final approach of helicopter formations. It helps him make sure pilots align correctly on the required landing direction. It also helps him ensure that they clear any obstacles. 4-30. The pathfinder leader organizes the control center to meet mission requirements. The control center can consist of a single pathfinder. This Soldier can operate the GTA radio for a limited period at a small site, or the control center can consist of the following staff:

## Lz Or Dz Commander

4-31. He supervises aircraft landings and departures, airdrops, and other pathfinder activities in the LZ or DZ. He might also serve as the GTA radio operator.

## Gta Radio Operator

4-32. He operates the radio used to maintain communications with pilots. He also provides advisories for his airspace as needed.

## Internal Net Recorder

4-33. Some situations require pathfinders to set up an internal net to communicate with other pathfinder elements. An internal net recorder (INR) runs this net and helps control aircraft at his HLZ. He logs details of all arrivals and departures on DA Form 7461-R, *Internal Net Record*,
(Figure 4-7, page 4-12). If an aircraft fails to arrive at its destination, search and rescue medical units check the DA Forms 7461-R so they know where to focus their search. The recorder might copy the blank, reproducible form from the back of this manual onto 812 by 11-inch paper. He might also download it from http://www.usapa.army.mil or copy it from the Army Electronic Library (AEL) CD-ROM (EM0001). Then he completes the form as follows:
PFDR Det. Write the name of the pathfinder detachment operating the landing zone.

Supported Unit. Write the name of the supported unit. Period
(DTG).

Write the date and time of the mission.*Operation*. Write the name of the mission.*Designation*.

Write the name and location of the site.

Recorder. Write your name.*No. A/C*. Write the number of aircraft in the formation.*Type A/C*. Write the nomenclature of each type of aircraft in the formation.

Contact Time. Write the time of the initial contact with the flight commander.

Call Sign. Write the flight commander's call sign.*Time, Arr*.

Write what time the aircraft or formation inserted.

Time, Dep. Write what time the aircraft or formation extracted. Load Type, Ins. Write what type of load the aircraft inserted.

Load Type, Ext. Write what type of load the aircraft extracted. Destination. Write the name of the aircraft's or formation's destination on leaving.

Remarks. Write anything else here that you think you need to record.

## Landing Site Party

4-34. The landing site party consists of a site team leader and other pathfinders and attached personnel, as required. A single pathfinder might establish and operate a small landing site for a limited time. He maintains a record of all aircraft and their respective cargos on DA Form
7461-R, *Internal Net Record.* Figure 4-7 shows an example of the completed form. A blank copy is provided in the back of this book for local reproduction on 8 1/2- by 11-inch paper. The form may also be downloaded from the Internet at Army Knowledge Online (http:// www.army.mil/usapa/eforms/) or the Army Publishing Directorate Web site (http://www.apd.army.mil/USAPA_PUB_formrange_f.asp).

## Site Team Leader

4-35. The site team leader reconnoiters, establishes, and operates the landing site. He supervises it and, at any time, might supervise the GTA radio operator. Some of his responsibilities include the following:

-  Organizing at an objective rally point. -  Reconnoitering to determine
-- Long axis.
--Usable area. --Ground slope (compute). -- Land heading. --Best landing formation.
-  Designating sling-load point(s). -  Emplacing and briefing the GTA radio operator. -  Clearing touchdown and slingload points. -  Organizing personnel and loads for air movement. -  Clearing or marking obstacles. -  Preparing for night and day missions. -  Continuing to improve the site.

## Extra Pathfinders

4-36. These Soldiers operate the GTA radio and the pathfinder internal radio net (if established), position and operate navigation and assembly aids, and clear or mark obstacles. Four factors dictate the number of extra pathfinders employed:

-  The size of the landing site. -  The expected density of air traffic. -  The number and type of visual and electronic aids used. -  The tactical situation.

## Commander

4-37. The commander can attach other Soldiers from supported units to the landing site party. The pathfinders brief and rehearse attached Soldiers. Only pathfinders reconnoiter actual landing areas, but attached personnel can

-  Reconnoiter other areas. -  Provide security. -  Help pathfinders set up and operate the landing site. -  Reconnoiter and mark assembly areas. -  Operate assembly aids.

## Section Iii. Landing Site Operations

Before they can start using a landing site, pathfinders need only pick its location and set up communications there. They continue marking and improving the site until it can support the ground tactical plan.

## Communications

4-38. As soon as they arrive at the landing site, pathfinders set up communications in the GTA net. If needed, they also set up the pathfinder internal net. They monitor these radio nets continuously, unless directed otherwise, until they complete operations at the site. 4-39. Tactical situation permitting, pathfinders locate each helicopter landing site within ground communication range of the other sites and manned RPs. The range of available radios dictates whether facilities within the LZ can communicate with each other. 4-40. The commander of the landing site for utility and cargo helicopters quickly reconnoiters the area to determine the exact direction of landing. He calculates an intercept heading from the RP if necessary. He selects the location of the landing point of the lead helicopter of each flight. Then he decides if the terrain or situation dictates any change to the planned landing formation. The site commander has pathfinders or other personnel compile landing instructions for transmittal to inbound helicopters. He also has them remove or mark obstacles in or around the site.

## Flight Formations

4-41. Ideally, all helicopters land at the same time in a planned flight formation. The landing site commander includes this information in his landing instructions to the flight leader. Pathfinders lay out the landing site in a location where helicopters will not fly directly over aircraft on the ground. The layout of the site also depends on the landing space available, the number and type of obstacles, unit SOPs, and prearranged flight formations.

## Landing Zone And Obstacle Markings

4-42. For daylight operations, pathfinders use only panels or some other minimal identification means to mark LZs (Figure 4-8 through Figure 4-11, pages 4-15 through 4-18). Smoke might also be used to identify an LZ and assist the pilot in determining wind conditions. However, smoke is also easily identified by the enemy. For daylight operations, mark the number one landing point using a single VS-17 panel, with the international orange side visible. Other TDPs might be marked, as coordinated. Mar obstacles using the cerise colored side of the panel. For night operations, they use chem-lights, lanterns, field expedients, or other methods to show the direction of landing and to mark individual landing points (Figure 4-12 and Figure 4-13, pages 4-19 and 4-20). For day and night air assault operations, they mark all obstacles. (Section V provides detailed information about conducting night operations.) 4-43. At night, pathfinders can use lights of different colors (except red, which marks obstacles) to designate different helicopter sites or to separate flights within a larger formation. A lighted "T" or inverted "Y" indicates both the landing point for the lead helicopter of each flight and the direction of approach (Figure 4-14, page 4-21). Other lights mark touchdown points for the other helicopters in the flight. Each helicopter should land with its right landing gear or its right skid 5 meters left of the lights. Large cargo helicopters (CH-47) land 10 meters to the left of the lights. 4-44. For security, pathfinders and the ground unit turn off, cover, or turn all lights upside down until the last practical moment before a helicopter arrives. Then they orient the lights in the direction from which the lead helicopter is approaching, and a signalman directs its landing.

Note: Because the marking lights could be too bright for the aircrew member's NVGs, he might have to look under it to distinguish the colors. Also, aircrew members wear NVGs with filtered lenses. These filters do not allow the aircrews to see blue or green chem-lights. Colors such as yellow, orange, red, and infrared can be seen by pilots wearing ANVIS.

## Air Assaults

4-45. During daylight air assault operations, pathfinders use red-colored panels or other red, easily-identifiable means to mark any hard-todetect, impossible-to-remove obstacles such as wires, holes, stumps, and rocks. During nighttime air assault operations, pathfinders use red lights to mark any obstacles within the landing site that they cannot reduce or remove. 4-46. In most combat situations, the need for security keeps pathfinders from using red lights to mark treetops on the departure end of a landing zone. However, in training or in a rear area landing site, they do use red lights. If they cannot mark obstacles or hazards, they must fully advise aviators of existing conditions by GTA radio. In any case, the pathfinder landing site leader makes sure that pathfinders mark the most dangerous obstacles first and, if possible, that they remove them. 4-47. If required to do so by the supported unit, pathfinders can mark initial assembly points for troops, equipment, and supplies. They should choose locations that help ensure the quick, efficient assembly and clearing of the helicopter site. If the unit will use the assembly areas, the ground unit commander selects their locations. If needed, supported ground unit Soldiers go with the pathfinders to reconnoiter and mark the unit assembly areas, set up assembly aids, act as guides, and help with landing and unloading operations. Having this help ensures that the pathfinders can rapidly clear troops, supplies, and equipment from the landing points. 4-48. Pathfinders have a limited capability to secure a landing site. If they precede the initial assault elements into a landing site, Soldiers from the supported ground unit can go with them for security.

## Intercept Headings

4-49. The heading from the RP (or from the CCP if the pathfinders do not use an RP) to the landing site coincides as closely as possible with the landing direction to keep the helicopter from having to turn sharply. The larger the formation, the more important this becomes. If a pilot cannot approach the landing site straight on, pathfinders will set up an intercept heading (Figure 4-15). They choose an intercept point far enough from touchdown to allow helicopters in formation a final approach of at least 1 to 2 miles. Flight leaders might need visual steering commands, time and distance information, terrain features, and electronic or visual navigation aids to help them determine the intercept point and the landing direction at the landing site.

## Section Iv. Landing Zone Operations

Helicopters approach the LZ along a designated flight route. They normally travel in serials containing four or five helicopters, but they sometimes travel as platoon-sized lifts. One serial might contain a flight for each helicopter site. Flights of medium or heavy transport helicopters (CH-47) carrying artillery or other bulk cargo often arrive at LZs one or two helicopters at a time (Figure 4-16). Later flights follow at the smallest time intervals. These intervals depend on the number of helicopters in each flight, the configuration and conditions of the landing site, and the nature of the cargo to be loaded or unloaded. During planning, the aviation unit commander determines the time between successive flights. Once an operation starts, pathfinders at the site recommend any changes needed to ensure helicopter safety or expedite operations. Night operations often require more time and distance between formations.

## Communications Checkpoint

4-50. As each helicopter serial reaches the CCP on the flight route, the flight leader contacts the appropriate helicopter landing site control center. 4-51. The CC then gives the flight leader the heading from the CCP to the landing site, the landing direction, and other relevant and important information, as follows:

-  Enemy situation. -  Friendly fires. -  Field elevation. -  Landing formation.
-  Terrain conditions.
-  Traffic situation. -  Obstacles. -  Availability of visual signals (smoke, light gun, and so forth). -  Next reporting point.
4-52. Before reaching the CCP, IAW instructions from the flight leader, all helicopters in a flight switch to the pathfinder control frequency.

Note: Pathfinders must stay prepared to provide ATC and navigational aid to all aircraft in and around the landing site in case those aircraft have no specified flight plan.

4-53. The helicopter formation continues along the flight route to the RP. The electronic and visual aids at the RP (if manned) help pilots navigate. As each helicopter passes over or near the RP, its flight serial leader reports this to the respective landing site CC. Then the helicopter flies directly to the assigned landing site. The CC at the individual landing site uses visual signals, steering commands, or electronic homing techniques to help any flight that cannot find its landing site.

## Day Operation Signals

4-54. For daylight operations, you can use different smoke colors for each landing site. You can use the same color more than once, just spread them out. Use smoke only if you have to, because the enemy can see it, too. Try to use it only when the pilot asks for help locating his helicopter site.

## Night Operation Signals

4-55. For night operations, IR strobe or other visual signals in lieu of smoke. As in daylight, red signals mean "DO NOT LAND," but you can also use them to indicate other emergency conditions. All concerned must plan and know emergency codes. Each flight lands at the assigned site according to CC messages and the visual aids displayed. You can use arm-and-hand signals to help control the landing, hovering, and parking of helicopters.

## Air Control Points

4-56. Pathfinders might have to manage air control points (ACPs) to help aircraft en route to the LZ.

## Acp Party Responsibilities

4-57. The ACP party consists of two or three pathfinders, or at least one pathfinder and assistants. The party positions and operates electronic navigation aids, visual navigation aids, or both. The party also operates radios in the pathfinder internal net (if used) and the GTA net. The ACP party monitors the GTA net so they can respond at once to any pilot's request for help finding an ACP.

## Navigation Aid Order

4-58. The ACP party installs navigation aids as soon as it arrives at the site or as planned. They try to set up all of the aids at the same time. However, if they cannot do this because they have too few people, or for some other reason, then they set them up in the following order:

## Gta Radio

4-59. The party sets this up first. Then, if the aviation unit commander has asked them to do so, they install the electronic homing beacon. This beacon allows the party to offer long-range guidance. If they do use the beacon, the party sets it up far enough away to prevent excessive radio interference. This also helps keep the enemy from destroying the radios and the beacon at the same time.

## Visual Navigation Aids

4-60. These navigation aids vary in number and type, depending on aviation unit SOPs and requirements and on the need for security. The ACP party removes any grass or brush that masks their usage of these aids, but they also plan a way to conceal the markings in case they sight enemy aircraft.

## Internal Net Recorder

4-61. The pathfinder internal net recorder sets up communications with the landing zone CCs as fast as he can. He immediately reports the state of ACP readiness and any information about the local enemy situation, if any. Unless directed to operate a beacon on a definite time schedule, he constantly monitors the radio.

## Security Personnel

4-62. The ACP party can include attached personnel from the supported units. These personnel provide security. They both move to their assigned locations and take up security positions, or they help set up and operate navigation aids and communications equipment.

## Section V. Night Operations

Daytime visual references (checkpoints for positive identification) are difficult to see at night. Visual aids for night navigation emit illumination. Having too few visual references can cause pilots to concentrate on a single light or group of lights in a concentrated area. This can cause visual illusions, which can then cause vertigo. To prevent this hazardous situation, pathfinders mark LZs with multiple lights and mark landing areas with two or more widely separated lights.

## Tactical Landing Lights

4-63. The tactical landing light system provides visual cues for landing in a tactical landing site. When the aircraft approaches from terrain flight altitudes, it should use the inverted "Y" system. Aircraft normally approach a tactical landing site without the aid of the search landing light. The lighting for a tactical LZ can consist of handheld flashlights or "beanbag" lights arranged on the ground. 4-64. Regardless of the type lighting device used, pathfinders identify the touchdown point with at least two lights. At night, they can designate different helicopter sites with lights of different colors. They might also use different colors to separate flights within a larger formation. A lighted (inverted) "Y" indicates the landing point of the lead helicopter (Figure 4-17).

4-65. At night, all landing lights should be placed in directional holes that can only be seen from the direction of approach and from above, but not from the ground. If this is not possible, the pathfinder turns his hood upside down, or keeps all lights off for security purposes until the last practical moment. 4-66. At other touchdown points, helicopters land with the right landing gear or skid just to the left of the light (Figure 4-18). They also place a signalman at a sling-load point. Then they beam the lights in the direction from which the helicopters approach.

4-67. Pathfinders display an inverted "Y" for cargo aircraft. This marker consists of five lights. Pathfinders place the fifth light IAW prior coordination with the supporting aviation unit (Figure 4-19). The fifth light can go 7 meters from furthest stem light in the direction of landing, or 10 meters opposite the landing direction (below) the right flank light. 4-68. Pathfinders will display a NATO landing "T" if an aircraft approaches the LZ from at least 500 above ground level (AGL), or anytime the pathfinders coordinate in advance with the supporting aviation unit. 4-69. Noncargo aircraft require a 5-meter separation between touchdown point and lights, with a 5-meter separation between lights.

4-70. Cargo aircraft require a 10-meter separation between touchdown point and lights, with a 10-meter separation between the lights. 4-71. During darkness, helicopters approach slightly steeper and slower than they would in daylight. 4-72. Vehicle headlights offer one kind of emergency night lighting. Pathfinders place two vehicles about 35 meters apart and 35 meters downwind of the landing point. They shine their headlights so that their beams intersect at the center of the landing point (Figure 4-20). The helicopter approaches into the wind, passes between the vehicles, and lands in the lighted area. This method does not work well for large helicopters.

When fully adapted to the night, the eyes grow
extremely sensitive to any light. Sudden exposure to a
light source causes partial to complete loss of night
vision. Thus, take care to avoid exposing pilots to light
sources. Also, if pilots are using NVG, avoid shining a
light directly at the aircraft, or use light sources
compatible with the NVG.

## External Loads

4-73. Employing external loads presents a challenge in the dark. Even so, the pathfinder can use one of several methods. If he lacks sufficient signalmen, he marks the load by placing three reference lights 25 meters in front of the load landing and pickup point. He spaces them in a triangle, 5 meters apart. This helps the flight crew during hookup, liftoff, and landing. On liftoff, the aircraft climbs vertically until the load clears the ground. As the helicopter begins to move forward, the pilot applies enough power to maintain a climb that allows the slingload to clear any obstacles on the liftoff path. The shorter the sling, the less altitude is required to clear obstacles.

## Multihelicopter Operations

4-74. Only by using NVG can pilots fly safely in formation in a complete blackout and at terrain flight altitudes.

## Night Vision Goggles

4-75. To operate at terrain flight altitudes during low- or mid-light levels, pathfinders use night vision goggles. If the lights used in the tactical lighting and marking are too bright for night vision goggles, pathfinders must place a filter over the light cover, paint the light covers, cover them with plastic tape, or use other means to reduce the intensity of the light. The night vision goggles commonly used by aviators (AN/PVS-8) generally have a filter to prevent the cockpit instruments and lighting from blinding the aircrew. However, these filters also prevent the aircrew from observing green and blue chemlights. These colors might be seen with the unaided eye if the aircrews adjust their goggles to look below them, but they will not be able to see the light source through the NVDs.

## Warning

When your unit trains with or employs the
tactical light set, wear a filter over your night
vision goggles to prevent eye injury. If you do
not have a filter, paint the lens cover or cover it
with plastic tape to reduce light intensity.

## Section Vi. Environmental Considerations

The pathfinder unit can expect to support the aviation commander and ground unit commander in many climates and types of terrain. The requirements for establishing a landing site or zone are similar. For aircraft to land safely and quickly in challenging environments, pathfinders must choose and prepare LZs carefully.

## Pilot Input

4-76. The pilot considers his experiences and his responsibilities to the crew and aircraft before determining whether a proposed landing site is safe. 4-77. Challenging climatic and terrain environments include extreme hot and cold weather and jungle, desert, and mountainous terrain. (For more detailed information on the climate, terrain, and operational aspects of these areas, see FM 90-3, FM 90-5, and FM 3-97.6.) 4-78. Each area requires the pilot to know and follow special procedures. The pathfinder who also knows these procedures can better advise and assist aviators and the supported ground unit.

## Cold Weather

4-79. Many parts of the world experience cold weather. Extreme cold and blowing snow pose special problems in ground operations and flight. Pathfinder mission planning includes considering the problems presented by ice, snow, or rain. The pathfinder's knowledge of flight procedures helps him advise the pilot about the existing surface conditions.

## Communications

4-80. Most locations allow generally-good radio communications. However, atmospheric electricity, such as the aurora borealis, can disrupt them. These events could disturb or block some frequencies.

Mountainous terrain also restricts communications. Pathfinders might need to set up relay stations. "Radio skipping" happens often in cold weather areas. Radio operators often hear long-distance radio traffic on tactical FM networks.

## Navigation

4-81. In snow-covered areas with flat terrain, pilots might need marked and manned RPs. When aircraft fly over loose snow, the air movement lifts the snow and circulates it into a snow cloud. This often produces a zero-visibility condition known as "whiteout," through which the pilot must take off or land blind (Figure 4-21). Whiteout conditions place extra demands on the landing site party.

## Surface Conditions

4-82. The pathfinder evaluates the surface of the ground to see whether aircraft can land without sinking too deep into the snow. He can use a tactical vehicle to test the hardness of the surface. The landing site party might also try to determine the degree of ground slope, and whether obstacles lie under the cover of snow at each landing point.

## Distance Between Aircraft

4-83. Pathfinders might need to increase the distance between aircraft to 100 meters and the size of the landing point to 100 meters in diameter.

## Landing Point Markings

4-84. Marking the landing points presents other problems. A pilot's depth perception is impaired in snow-covered areas. A signalman on the ground provides a useful reference for estimating height. In daytime, pathfinders mark touchdown points so the pilot can find a clear and safe landing area.

## Whiteouts

4-85. If the tactical situation permits, the GTA radio operator advises the pilot of the surface conditions so the pilot can plan how to approach. Using the echelon left or right landing formation reduces the effect of snow clouds (also called "whiteouts") on subsequent landings. The pathfinder plans to stagger aircraft arrivals to let the snow clouds settle.

## Multiple Landing Sites

4-86. Depending on the mission requirements, climatic conditions, and the expected times of the landings, the pathfinder leader might decide to use multiple landing sites.

## Night Approaches

4-87. Aircraft making night approaches to snow sites need a visual reference point on the ground such as runway or tactical landing lights. These lights help the pilot judge the angle of descent and rate of closure. He plans the approach to land short of the touchdown point. This ensures that he does not overshoot the point and have to decelerate rapidly in the snow cloud produced by his own aircraft. Approaching short allows the pilot to maintain airspeed after leveling off, and to keep the aircraft in front of the snow cloud until touchdown.

## Adjustment Of Inverted "Y"

4-88. If he coordinates with the flight commander before the landing, the pathfinder can adjust his inverted "Y" forward 10 meters in front of his designated Number 1 touchdown point. This way, the landing site party takes advantage of all usable areas on the site.

## Signalman

4-89. The pathfinder leader positions any extra personnel to act as signalmen for aircraft approaching other touchdown points. While aircraft approach and land, he makes sure that signalmen remain in safe areas. Other signalmen should also control the loading of personnel on the aircraft, as instructed by the crew chief or the crew. The technique for landing on snow with a slingload resembles other types of approach, but the pilot hovers at a higher altitude because of the load (A, Figure 4-21). He has a hard time judging the height of the slingload (the height above the ground) as it nears the snow surface. He relies on a signalman to keep him informed. To avoid building up a snow cloud, the pilot puts the load on the ground as fast as he can (B, Figure 4-21).

## Slingload Operations

4-90. The CH-47 requires a sling length of at least 50 feet. Other aircraft allow a shorter sling. Normally an aircraft hovers during hookup and liftoff with a slingload. Doing this above snow produces a snow cloud (B, Figure 4-21). The pilot must expect this and plan for it. In fact, when operating over snow-covered terrain, the pilot can use the most common techniquehovering the helicopter over the load while the ground crew attaches the sling to the hookor not.

4-91. The pilot can land to the left of the load, but close enough for hookup personnel to attach the sling to it.

4-92. When ready for liftoff, the pilot starts a slow, vertical ascent, with enough lateral movement to position the aircraft over the load (C, Figure 4-21). He keeps ascending until the load clears the ground, and then he checks hover power, starts accelerating, and continues to climb.

## Warning

Rotor wash increases the risk of frostbite. Make
sure you and anyone else on the ground dresses
for the conditions and keeps or uses a face mask
and goggles.

## Static Electricity

4-93. During cold weather, static electricity creates serious problems. Moving an aircraft through the air, brushing snow and ice from an aircraft, or dragging steel cables over the snow can generate static electricity. During external load operations, aviators key the FM radio just before load pickup. This discharges the aircraft's static electrical charge. Because the charge rapidly builds up again, hookup personnel use a grounding device to avoid electrical shock (Chapter 5 says more about static discharge wands).

## Safety

4-94. Accumulated ice on aircraft structural and moving parts presents a danger to nearby ground personnel. The aircraft can accumulate ice up to three-quarters of an inch thick during flight in temperatures and altitudes where icing conditions exist. During flight at less extreme temperatures, this ice begins to loosen and fall off. Ice might shed while the helicopter loses altitude during the landing approach and during touchdown, and pieces of ice shed by the main rotor can fly outward as much as 300 feet. Ground personnel should stay a safe distance away from helicopters during landing and shutdown (after flight in icing conditions), and passengers should not exit until the rotor blades have stopped.

## Jungle

4-95. Jungle areas impede military operations. Jungle areas promise heat, humidity, rainy seasons, and other weather conditions that reduce aircraft performance.

## Communications

4-96. Jungle tends to obstruct military lines of communication. Thick vegetation, irregular terrain, and adverse atmospheric conditions screen radio transmissions. The ground or supported might have to use radio relays. They might also have to staff and mark the CCP. If communications are limited in range, pathfinders might also have to provide GTA communications to advise and direct the pilot to the landing site.

## Landing Sites

4-97. Jungle conditions mean small landing sites that can handle only a few aircraft at a time. Small landing sites also mean a reduced allowable cargo load (ACL). Pathfinders evaluate surface conditions at the landing site to make sure the aircraft will not sink or bog down in the soil. Then they survey the site for vines, trees, and other obstructions in the approach path and near the touchdown point.

## Navigation

4-98. On an approach to a jungle landing site, the pilot avoids using a high rate of descent. He uses a steep enough angle of descent to just clear any obstacles. He normally uses a ten-to-one obstacle ratio, but for a jungle operation, he should reduce this ratio to no less than five to one. Due to density altitude problems in tropical areas, the aircraft might not be able to develop enough lift to clear tall obstacles. So, the pathfinder leader considers obstacle height on the approach and departure ends. When site size and terrain conditions permit, the pilot might run the liftoffs and landings. However, the small size of a jungle site, soft terrain, or obstacles can keep him from doing so.

## Lights

4-99. The tactical situation might restrict the use of lights in nighttime jungle LZ operations.

## Security

4-100. Success of the ground unit commander's mission relies on site security. Because jungle terrain provides cover and concealment, landing site security presents a constant challenge. The pathfinder team leader coordinates with the flight commander to set a specific time to light the site.

## Liftoffs And Landings

4-101. The pathfinder orients the site to the direction of the wind. He keeps departure obstacle ratios low due to climatic conditions, jungle vegetation, and helicopter's reduced lift capability. Because ground effects reduce the aircraft's lift efficiency, the pilot hovers as low as possible and lingers no longer than necessary.

## Desert

4-102. The typical desert is a dry, barren region, generally treeless and sandy. It has environmental extremes, with violent and unpredictable weather changes. Its terrain conforms to no particular model. Frequent clear days offer unequaled visibility and flight conditions, but a sudden sandstorm immediately halts all operations. Successful desert operations require special training, acclimatization, and great self-discipline.

## Communications

4-103. In desert operations, the radio offers the best way to communicate. The low, rolling terrain allows good radio range. Due to the increased distances involved in military desert operations, FM radio communications might prove inadequate, especially in the higher FM frequencies. Pathfinders, aircraft, and ground crew must all have highfrequency radio equipment. Sand or dust in equipment or a poor electrical ground cause most communication problems. Due to the increased distances between land force units engaged in desert operations, helicopters might provide air or ground relay or help deploy ground radio rebroadcast facilities.

## Navigation

4-104. Many of the conditions experienced in cold weather operations resemble those in desert operations. Pathfinders and pilots find distances and altitudes hard to judge in the desert. The lack of definable terrain features makes navigation difficult, especially at night and over long distances. Also, the sameness of the terrain can influence a pilot to pay less attention to his surroundings. Pathfinders might have to mark and man release points.

## Landing Sites

4-105. The climatic conditions in the desert profoundly affect the setup and operation of landing sites. Most importantly, the pathfinder must consider density altitude, wind, and sand (dust). Sand on a landing site can produce brownout conditions similar to those in snowy areas, so the same precautions apply. This makes a rocky area a better landing site than a sandy hollow, depression, or valley.

## Wind

4-106. Desert winds generally calm down for an hour or two around sundown. Another calm occurs before sunrise. Other than those times, desert winds can drive dense clouds of dust and sand with hurricane force. Strong winds naturally raise dense clouds of dust and sand, and rapid temperature changes often follow strong winds. The pathfinder leader must consider what times of day the wind will allow him to operate the landing site. 4-107. The extreme heat often experienced in the desert also affects the aircraft's ACL. When supporting a ground unit, the pathfinder leader coordinates with the aviation element to determine the ACL for each type of aircraft. Both the minimum distance between aircraft and the size of the landing point might increase in desert operations: 100 meters between aircraft, 100-meter-diameter landing points. In daylight hours, ground-crew members mark the touchdown points. They paint sandbags a bright color or mark them using some other quick method. Ideally, they use signalmen. 4-108. When establishing a landing site, the pathfinder leader considers taxi procedures. When an aircraft must taxi, the pilot moves it into a vertical position as quickly as possible to reduce the amount of sand (dust) the engine sucks in as well as to avoid a brownout. Pilots should avoid taxiing over the same area repeatedly.

## Liftoffs

4-109. Pilots will not try a normal liftoff in a sandstorm. Helicopters with wheels and airplanes should make a running-type takeoff. Helicopters with skids should make a maximum performance liftoff.

## Landings

4-110. When they can, pilots should use a running-type landing to reduce sand intake. If a pilot can make a running landing, he keeps the touchdown roll to a minimum to keep from overloading the landing gear. If the terrain does not permit a running landing, the pilot lands at a greater-than-normal angle. He should never land from a hover.

## Safety

4-111. Ground crew personnel should wear clothing that will protect them against the sand blown around by the rotor wash. Each person on the ground should take special care to keep the sand out of his eyes, ears, nose, and mouth. Goggles, earplugs, and cloth masks provide adequate protection for facial areas. Other ground crew procedures resemble those for cold weather operations.

## Mountains

4-112. Mountains have rugged, divided terrain with steep slopes and few natural or man-made lines of communication. Weather fluctuates seasonally from extreme cold, with ice and snow, to extreme heat. Also, it can switch between the two extremes very quickly. This unpredictability greatly affects operations.

## Communications

4-113. Mountainous terrain often limits or restricts communications. To maintain communications within the AO, aircraft might have to limit operations to the vicinity of the unit. Other aircraft can serve as radio relay stations. Pathfinder units might also have to set up radio relays at the RP, CCP, or both. 4-114. Mountain conditions challenge aviators in pathfinder operations more than any other conditions. For precise flying in mountainous areas, pilots need large-scale terrain maps. 4-115. Since intervening terrain degrades GTA communications, providing navigational aid and control over extended ranges might prove difficult.

## Wind

4-116. The main weather hazard in the mountains is wind. Even moderate winds (11 to 20 knots) can produce significant turbulence over mountain ridges. Predicting wind conditions is difficult. The windward side of a mountain maintains a steady direction of airflow, though the strength of the wind might vary. The leeward side has turbulent winds with strong vertical currents. This turbulence might prevent assault landings and require pilots to fly at higher altitudes. This naturally increases the risk of detection and destruction.

## Density Altitude

4-117. In the mountains, density altitude can vary a lot between PZs and LZs. It can also vary greatly from one time of day to another. It normally peaks in the late afternoon, and drops to its lowest point at dawn.

## Navigation

4-118. In the mountains, the helicopter offers the best way to rapidly move forces. In the offense, air assault operations can insert forces into the enemy's rear area and bypass or envelop his defenses. In the defense, helicopters can move reinforcements and reserves rapidly.

## Landing Sites

4-119. Mountainous regions offer few, if any, airfields for fixed-wing aircraft, and few LZs suitable for multiple helicopters. 4-120. If the enemy situation allows, pathfinders set up LZs on the windward side of the mountain because that side offers more stable winds. 4-121. When they can only find LZs designed for single aircraft, planners increase in-flight spacing. This places an extra load on each crew. When conducting multiship operations into a small LZ, the pathfinder controller should allow sufficient time between liftoff and landing for the turbulent air generated during the departure of the previous helicopter to stabilize. Otherwise, the pilot of the incoming craft will experience that turbulence and lose lift. 4-122. A pilot must touch down very carefully on the typical small, rough, sloped mountain LZ. Depending on the angle of the slope and on the aircraft's available torque, the pilot might be able to make a normal slope landing. Pilots of larger craft, such as cargo helicopters, might have trouble positioning the entire fuselage in the available area. Once the cockpit extends over the landing area, the pilot cannot see the ground. He must rely on the crew chief and signalman to direct him.

4-123. During a mountain approach to an LZ surrounded by uneven terrain, the pilot has a hard time determining the actual aircraft altitude and rate of closure. Where the terrain slopes up to the LZ, a visual illusion occurs. The pilot might think he is flying too high and closing too slowly. If the terrain slopes down to the LZ, he might feel he is flying too low and closing too fast. Employing a signalman on the ground gives the pilot a visual reference to adjust his controls. He might need more than one signalman.

## Site Assessment

4-124. Pathfinders should determine the following information while reconnoitering and selecting a mountain site:

-  The size, slope, amount of surface debris, and the area covered by
shadows and obstacles in and around the site.
-  The approximate direction, speed, and characteristics of the wind.
-  The inbound route, if necessary. When the pilot cannot land due to
a steep slope, the aircraft might terminate at a hover to off-load troops and supplies.
-  The departure route. Departure routes should orient into the wind
and over the lowest obstacles.

## Section Vii. Approach Path Considerations

Pilots should try to land their aircraft into the wind; however, the terrain and its effect on the wind might require a crosswind landing. If so, the pilot for single-rotor helicopters should plan the approach so that the wind blows from the left side of the aircraft. This helps the pilot overcome the effects of torque, reduces power requirements, and helps him control the heading. Other considerations include vertical air currents, escape routes, terrain contour and obstacles, and the position of the sun.

## Vertical Air Currents

4-125. Updrafts on the approach path make landing easier. However, severe vertical air currents (updrafts or downdrafts) might require the pilot to approach downwind.

## Escape Routes

4-126. The pathfinders and pilots should plan one or more escape routes along the approach path for the pilot to use if he must go around and try the approach again.

## Terrain Contour And Obstacles

4-127. The height of terrain and obstacles along the approach path should permit the pilot to conduct a shallow approach angle into the landing site. When possible, the pathfinders select a landing point on or near the highest terrain feature.

## Position Of The Sun

4-128. Though the pilot first considers wind direction and nature of the terrain when choosing the approach path, he must also consider the relative location of the sun and shade. To keep the pilot from having to adjust from one light condition to another, the pathfinder makes sure that if the landing point falls in a shaded spot, the whole approach path does as well. When the sun rises or falls to just above the horizon, avoid using an approach path that faces directly into it.

## Chapter 5 External Loads

Carrying cargo and equipment outside the helicopter eliminates many of the problems that other modes of transportation have. Helicopters move cargo by external slingload when

-  The cargo compartment cannot hold the load. -  The load exceeds the helicopter's internal load limitation. -  The ground crew must load or unload the cargo at once. -  Landing zone conditions prevent the aircraft from
touching down.
Pathfinder-qualified Soldiers prepare to organize and control external load pickup or drop-off sites as an integral part of LZ operations. The supported unit provides a detailed load plan, to include rough weights and sequences of load movement. This ensures the correct and rapid movement and placement of cargo.

## Landing Points

5-1. Conditions such as a dusty surfaces, darkness, or obstacles often require pathfinders to increase the minimum spacing between loads and landing points. This reduces the number of helicopters that can safely operate at the site at the same time, the size of the mission that can be supported, and the overall speed of the operation.

## Types Of Loads

5-2. All external loads fall under one of three types: high density, low density, or aerodynamic. Each exhibits unique characteristics in flight. Pathfinders determine the type, size, and weight of the load during the planning phase of the operation.

## High Density

5-3. The high-density load offers the best stability.

## Low Density

5-4. The low-density load offers the least stability.

## Aerodynamic

5-5. The aerodynamic load lacks stability until the airstream stabilizes the load. The ACL depends on the type of aircraft, the age of the airframe, the altitude above sea level, the temperature, the humidity, and the aviation unit's SOP.

## Unit Responsibilities

5-6. Most slingload operations involve four units. Each has pathfinders who perform specific functions.

## Supported Unit

5-7. The supported unit moves equipment and rigs the loads. Pathfinders in the supported unit check the weight, rigging, and positioning of all external loads to ensure helicopter safety. Ideally, the supported unit provides hookup personnel for individual loads. In the supported unit, pathfinders assist in

-  Selecting, preparing, and controlling the PZ. -  Coordinating in advance with the supporting unit. -  Rigging the loads. -  Furnishing slings, straps, clevises, and any other slingload
equipment required for the move.
-  Checking for improper rigging and weight in excess of the aircraft's
ACL.

## Aviation Unit

5-8. This is the aviation unit that will fly the loads. They

-  Provide advice and technical help to the supported unit, as
required.
-  Ensure that the loads fall within the transporting aircraft's ACL. -  Provide assistance in the recovery and return of slingload
equipment.
-  Advise the supported unit on load limitations. -  Advise the supported and receiving units on the suitability of
selected LZs and PZs.
-  Establish coordination with the supported and receiving units.

## Receiving Unit

5-9. The receiving unit
-  Selects, prepares, and controls the LZ. -  Provides trained ground crews to guide the aircraft and de-rig the
loads.
-  Coordinates with the supporting unit for the control and return of
the slingload equipment.
-  Inspects the rigging of back loads.

## Pathfinder Unit

5-10. In the pathfinder unit, pathfinders
-  Provide advice and aid to the supported, aviation, and receiving
units.
-  Provide expertise in the planning and execution of both PZ and HLZ
operations.
-  Supervise the rigging and inspection of all the loads.
-  Provide ground guidance and air traffic control during the
slingload.
-  Ensure that the loads fall under the transporting aircraft's ACL.

## Equipment

5-11. Cargo nets and slings make up an essential part of the external load operation. During an inspection, they require the same level of attention that the cargo receives. Any evidence of frayed or cut webbing justifies replacement of the affected component. When they assemble slings, pathfinders should avoid sewing up torn slings or substituting nonstandard parts in the field. Slings must meet the critical strength requirements specified in FM 10-450-3. The Army's inventory includes a variety of equipment adapted or designated for use in slingload operations.

## Aerial-Delivery Slings

5-12. Aerial-delivery slings (ADSs) were originally designed to deliver heavy loads by air (Table 5-1). They have been adapted for use in air assault operations. ADSs come in a variety of sizes and strengths, as shown in FM 10-450-3.

## Hitches

5-13. When connecting ADSs to metal air items or directly to the load, loaders use one of the following hitches (Figure 5-1).

## Choker

5-14. Pull the free-running end of the sling around the point of attachment. Draw it between the loops of the sling's standing end. After making sure that the cotton buffer is in its proper place, "milk" down the keeper on the standing end to secure the sling.

## Basket

5-15. Separate the loops of the sling at one end. Place the sling over the suspension point. Ensure that the cotton buffer is in its proper place. To secure the sling, "milk" down the keeper towards the suspension point.

## Nets And Containers

5-16. The Army has many types of cargo containers. However, the 5,000- and 10,000-pound cargo nets and the A-22 cargo bag are the ones most often used to transport cargo externally. FM 10-450-3 describes how to inspect both the large cargo net and the A-22 cargo bag (Figure 5-2). It also provides rigging instructions. Avoid overloading the nets; use them with loads that fall within the aviation unit's prescribed limits. Pick up the nets rather than drag them across the ground, because dragging them can cause them to snag on something and damage the net or the thing it snags. Use a canvas insert when carrying items small enough to slip through the netting.

## Small (5,000-Pound Capacity) Cargo Net

5-17. This olive drab net can carry up to 5,000 pounds or 125 cubic feet of cargo (NSN 1670-01-058-3811, line item number [LIN] 2776).

## Large (10,000-Pound Capacity) Cargo Net

5-18. This larger net can carry up to 10,000 pounds or 380 cubic feet of cargo (NSN 1670-01-058-3810, LIN NO 2708). It is 18 feet wide and can transport boxed or bulky loads (Figure 5-2).

## A-22 Cargo Bag

5-19. The A-22 cargo bag, with or without its canvas cover, can externally transport standard palletized loads, loose cargo, ammunition, oil drums, and other general items whose total weight falls under 2,200 pounds (Figure 5-3).

## Suspension Clevises

5-20. Clevises come in three sizes.

## Large

5-21. This clevis (NSN 4030-00-090-5354) has a rated capacity of 12,500 pounds (pendant) with a 7,875-pound sling-to-lifting provision point of attachment. Adding more large clevises as attaching points increases rated capacity as follows:

-  Two large clevises increase rated capacity to 15,750 pounds. -  Three large clevises increase rated capacity to 23,625 pounds. -  Four large clevises increase rated capacity to 31,500 pounds.

## Medium

5-22. This clevis (NSN 1670 4030-00-678-8562, Figure 5-4) has a rated capacity of 6,250 pounds (pendant) with a 3,750-pound sling-to-lifting provision. Adding more medium clevises as attaching points increases rated capacity as follows:

-  Two medium clevises increase rated capacity to 7,500 pounds.
-  Three medium clevises increase rated capacity to 11,250 pounds. -  Four medium clevises increase rated capacity to 15,000 pounds.

## Small

5-23. This clevis (NSN 1670 4030-00-360-0304) has a rated capacity of 6,250 pounds (pendant) with a 3,750-pound sling-to-lifting provision.

Adding more small clevises as attaching points increases rated capacity as follows:

-  Two small clevises increase rated capacity to 7,500 pounds.
-  Three small clevises increase rated capacity to 11,250 pounds. -  Four small clevises increase rated capacity to 15,000 pounds.

## Reach Pendants

5-24. A reach pendant is a synthetic rope assembly with an attached, stiffened reach tube and a loop on each end. The built-in reach tube enables the hookup man to place the pendant's top eye on the helicopter cargo hook while the helicopter hovers at a higher distance over the load (Figure 5-5). Two reach pendants are authorized for use with slingloads. To use either pendant with a sling set, remove the sling set apex fitting pin; place the pendant's lower eye in the apex fitting; and reinstall the apex fitting pin.

## 11,000-Pound Capacity

5-25. The 11K, NSN 4020-01-365-3115, part number DSG-5-11K, measures about 5 feet long and has an 11,000-pound safe working load capacity. The top eye is black with a small diameter loop, while the bottom eye is green with a larger diameter loop. The safe working load capacity is stamped on the reach tube.

## 25,000-Pound Capacity

5-26. The 25K, NSN 4020-01-337-3185, part number BOS-14-K7, measures about 5 feet long and has a 25,000-pound safe working load capacity. The top eye is black with a small diameter loop, while the bottom eye is also black, but has a larger diameter loop. The safe working load capacity is stamped on the reach tube.

## Inspection

5-27. Inspect the reach pendants *before and after* use. Check for cuts and tears in the nylon-urethane plastic sheath on each loop. If the white strength member (third layer) shows, remove the pendant from service.

## Cleaning

5-28. Clean the reach pendant with a mixture of warm water and mild dish or laundry detergent. You can use mineral spirits to remove oil and grease. You can treat the top and bottom eyes with silicone spray. However, do not use silicone spray on the reach tube.

## Storage

5-29. Store the reach pendants in a clean, dry area out of direct sunlight. Prolonged exposure to sunlight will deteriorate the strength of reach pendants.

## Caution

Avoid getting silicone spray on the reach tube. Avoid
using
       chemical
                   cleaners
                              on
                                   reach
                                           pendants.
Chemicals may weaken the strength members of the
pendant. If a pendant becomes contaminated with
chemicals, remove it from service.

## Polyester Roundslings

5-30. Use polyester roundslings as the primary vertical pendant (Figure 5-6). You can use one of three hitches to attach roundslings to the load. The lifting capacity of polyester roundslings varies with the size of the sling and the type of hitch used to attach the load. Each sling has two identification tags permanently sewn to the eye and eye sleeve. These identify the size and capacity of the roundsling as well as other information needed for its safe use. Roundslings are also color-coded by size. Table 5-2 lists roundsling lengths and lift capacities.

## Storage

5-31. Store roundslings in a clean, dry, cool area out of direct sunlight. Prolonged exposure to sunlight will deteriorate the strength of roundslings.

## Inspection

5-32. Inspect each polyester roundsling before and after every use. Remove it from service if you find any of the following:

-  Missing or unreadable identification tags. -  Acid or alkali burns. -  Melted, charred, or weld-splattered portions. -  Any holes, tears, cuts, snags, embedded particles, broken or worn
stitching, or abrasive wear that exposes the core fibers.
-  Knots in any part of the roundsling. -  Distortion, excessive pitting, corrosion, or broken fitting(s). -  Any other condition that causes doubt as to the strength of the
roundsling.

## Caution

Avoid dragging roundslings on the floor or over rough surfaces. Never twist them or join them together with knots.

## Service Life Of Aerial-Delivery Slings

5-33. The first person to use a sling must date-stamp it with the calendar or Julian date in 1-inch letters. He can use orange-yellow parachutemarking ink, strata blue parachute-marking ink, or an orange-yellow tube-type marker. He marks near the first keeper at both ends of the sling. This date determines the date of the next inspection. Every six months, the current user reinspects the sling; strikes through the last date in the same color it was written in; and in either of the other two colors, marks the date he reinspected the sling. *Every single user* inspects every single sling before and after *every single use*. If the condition of the sling seems questionable, he removes the sling from service (Figure 5-7).

## General Inspection

5-34. When inspecting nylon air items, note that if you find more than three consecutive broken or loose stitches, or five or more broken or loose stitches overall in the sewn portion, the item is unserviceable. After rigging the load with any nylon air item, put cotton buffers in place to prevent any nylon-to-nylon or nylon-to-metal contact. Look for the following:

-  Inspection date that has already passed (an inspection is overdue). -  Foreign matter or chemicals such as mildew, paint, or grease. -  Cuts. -  Frays. -  Burns. -  Broken stitches. -  Missing cotton buffers, sliding keepers, or permanent keepers. -  Rust.

## Cargo Strap

5-35. The A7A cotton or nylon cargo strap measures 188 inches long and has a rated capacity of 500 pounds. A friction adapter located on one end of the strap has a thick-lipped metal floating bar. Supply issues this strap with one metal D-ring. Inspect this piece of equipment for cuts or frays.

## Cargo Tie-Down Equipment

5-36. Check the tie-downs for serviceability.

## Cgu-1B Tie-Down Strap

5-37. The CGU-1B cargo tie-down device has a rated capacity of 5,000 pounds. You can adjust the length of this device.

## 15-Foot Tie-Down Strap

5-38. The 15-foot cargo tie-down strap, issued with a quick-fit strap fastener, has a rated capacity of 5,000 pounds.

## Load Binders

5-39. The two load binder types are rated for 10,000 pounds and 5,000 pounds. The 10,000-pound capacity load binder has its rating stamped on the side.

## Metal Air Items

5-40. Thoroughly inspect metal air items for rust, stripped threads on the nuts or bolts, burrs, cracks, bent or twisted metal, or oil. When using any clevis assembly, tighten the nut hand-tight only.

## Inspection

5-41. Use the Type IV link assembly (NSN 1670-00-783-5988) to build a 3-foot donut or to connect one ADS to another (Figure 5-8). This link assembly has a rated capacity of 12,500 pounds. When inspecting the Type IV link assembly, look for the following deficiencies:

-  Hard to rotate or irregularly rotating aluminum buffers. -  Bent or cracked posts. -  Bent slide connectors. -  The absence of a metallic "click" when it locks.

## Points Of Attachment

5-42. In slingload operations, the clevis assemblies serve as points of attachment from the aircraft to the load.

## Tightening

5-43. When using any clevis assembly, tighten the nut by hand only. Tape both ends of the nut and bolt to prevent slippage during use. Choose only case-hardened nuts and bolts. Never mix items. The bolt heads have case-hardened marks such as ticks, numbers, letters, or a combination of all three.

## Large-Capacity Sling Sets

5-44. The new 10,000-pound and 25,000-pound capacity sling sets are similar, except for a few minor differences. All components have identifying marks. You may only exchange apex fittings between sets. Take care not to mix up the other components. Table 5-3 compares these two large-capacity sling sets, and Figure 5-9 shows one.

| Type Sling       | 10,000-Pound        |
|------------------|---------------------|
| Sling            |                     |
| 25,000-Pound     |                     |
| Sling            |                     |
| Capacity:        | 10,000 pounds       |
| Apex fitting     | Color:              |
| steel            |                     |
| Pin diameter:    | 1 1/8-inch diameter |
| Weight:          | 4 1/2 pounds        |
| Sling rope       | Color:              |
| Length:          | 12 feet             |
| Diameter:        | 7/8 inch            |
| Chain links-     |                     |
| quantity:        |                     |
| 110 to 115 links | 86 to 88 links      |
| NSN:             | 1670-01-027-2902    |
| Total weight:    | 52 pounds           |

## Caution

Each sling set has four legs. Each leg has a rated
capacity of one-quarter of the total capacity of the set.
On some loads, you will use up to six legs. However,
remember that adding two legs does not increase the
rated capacity of the entire set.

5-45. The nylon rope assembly for each set has an interwoven eye located at each end. A polyurethane fitting covers the eye to protect the leg from abrasion and ultraviolet radiation (Figure 5-9). Each doublebraided rope connects to a grabhook assembly. Figure 5-10, Figure 5-11, and Figure 5-12 show a coupling link, sling leg-numbering sequence, and a grabhook, respectively. Though the grabhooks for the two sets look alike, you cannot interchange them because they have different ratings. 5-46. FM 10-450-3 and TM 10-1670-295-23&P discuss how to inspect the rope sling sets. FM 10-450-3 also provides sling-conversion tables. 5-47. Secure the cross pin on each apex fitting with a 3/8-inch bolt, a castellated nut, and a cotter pin.

## Aircraft Load Limitations

5-48. The structural strength of the cargo hook assembly determines the maximum weight that any aircraft can carry with an external slingload. In most cases, the tensile strength of the hook does not limit the weight that an aircraft can lift; the allowable cargo load does. In fact, the capacity of the cargo hook assembly usually exceeds the ACL.

## Tensile Strength

5-49. Cargo hook tensile strengths for US Army aircraft show

-  UH-1H/UH-1N Iroquois - 4,000 or 5,000 pounds (Figure 5-13). -  UH-60A/60L Blackhawks - 8,000 or 9,000 pounds (Figure 5-14). -  CH-47D Chinook - 26,000 pounds (Figure 5-15, page 5-18).

## Uh-1H

5-50. When transporting external loads with a UH-1H, use a nylon donut or web ring to attach the load to the aircraft. The cargo hook on the UH-1H is stationary; using an apex with a heavy load would bind the hook and shear it off. The cargo hook tensile strengths for the UH-1H is 4,000 pounds; for the UH-1N, it is 5,000 pounds.

## Uh-60 Blackhawk

5-51. When using the 10,000-pound apex to secure an external load to the UH-60, you must also use the aluminum spacer. The spacer is not required, or recommended, when using a 25,000-pound apex. However, if you use the 25,000-pound apex with spacer, the cargo hook must be manually operated by an aircraft crewmember or a member of the hookup team. *Never* use a donut or web ring on a UH-60. The web ring will bind on the hook and prevent the crew from releasing the load in an emergency. The tensile strength of the UH-60 cargo hook system is, for the UH-60A, 8,000 pounds and for the UH-60L, 9,000 pounds.

## Standard Weights

5-52. When using a UH-60 Blackhawk for airlift, coordinate closely with the aviation unit for the ACL. For the standard weights of petroleum, oils, and lubricants (POL), for external loads only, see Table 5-4.

Standard vehicle and artillery weights follow in Table 5-5 and Table
5-6.

| Fuel                 | 55-Gallon    |
|----------------------|--------------|
| Drum                 |              |
| 500-Gallon           |              |
| Blivet               |              |
| Motor gasoline       |              |
| (MOGAS)              |              |
| 404 pounds           | 3,400 pounds |
| Gasoline (JP4/JP8)   | 410 pounds   |
| Diesel fuel          | 457 pounds   |
| Lube oil (30 weight) | 479 pounds   |
| Vehicle                  | Weight       |
|--------------------------|--------------|
| 5,200 pounds (empty)     |              |
| 7,700 pounds (loaded)    |              |
| M998/M1038 Truck,        |              |
| Cargo, 1 1/4-ton         |              |
| (HMMWV)                  |              |
| M966 TOW Missile Carrier |              |
| (HMMWV)                  |              |
| 6,050 pounds (empty)     |              |
| 8,200 pounds (loaded)    |              |
| M416 1/4-Ton Trailer     | 580 pounds   |
| M101A2 3/4-Ton Trailer   | 1,350 pounds |
| M105A2 1 1/2-Ton Trailer | 2,750 pounds |
| M35A2 2 1/2-Ton Truck     |
|---------------------------|
| pounds if equipped with a |
| winch)                    |
| M149 1 1/4-Ton Water      |
| Trailer                   |
| 2,540 pounds (empty)      |
| 6,060 pounds (full)       |
| M149A1 1 1/4-Ton Water    |
| Trailer                   |
| 2,540 pounds (empty)      |
| 6,060 pounds (full)       |
| M149A2 1 1/4-Ton Water    |
| Trailer                   |
| 2,800 pounds (empty)      |
| 6,320 pounds (full)       |
| Artillery                        |
|----------------------------------|
| M101 105-mm                      |
| howitzer                         |
| 4,600 pounds (add 300 pounds if  |
| equipped with shields)           |
| M102 105-mm                      |
| howitzer                         |
| 3,160 pounds (add 170 pounds for |
| section equipment)               |
| 105-mm                           |
| ammunition                       |
| 60 pounds (each box)             |
| 105-mm                           |
| ammunition                       |
| 47 pounds (each carton)          |

## Air Items Required For Common Standard Loads

5-53. Pathfinders require several types of expendable rigging supplies to complete the rigging of the loads discussed in this paragraph. These supplies include 1/4-inch cotton webbing (80-pound test), 3/8-inch diameter rope (3,180-pound test), 7/16-inch diameter nylon rope (4,500-pound test), type III nylon cord (550-pound test), pressuresensitive tape, cellulose wadding or paperboard energy-dissipating material, and canvas or felt padding. Pathfinders should obtain sufficient supplies of these items before rigging the loads. To rig loads with ADSs and with more than one suspension point, twist an ADS once for each 3 feet of sling length. This reduces vibration in the sling during flight. The nylon and chain multileg sling sets and the 10,000- and 25,000-pound capacity sling sets do not require the twists. FM 10-450-3 discusses preparation and rigging for the following loads in detail.

## Cargo Net

5-54. A 5,000-pound-capacity (15 feet square) or 10,000-pound-capacity (18 feet square) nylon cargo net requires one A7A cargo strap or length of rope. With this the pathfinder can secure the net together on top of the load to prevent smaller items from falling out of the net.

## Perforated Steel Planking

5-55. Perforated steel planking (PSP) requires

-  Two 16-foot, two or three-loop ADSs. -  One 3-foot ADS with one type IV link assembly (for donut).

## Fuel Drums

5-56. One or two rubber or fabric fuel drums (blivets), each of which contains 500 gallons of fuel and a 10,000-pound-capacity sling set.

## Concertina Wire

5-57. The items required to move this load depend on the amount of concertina wire in the load.

## Cargo Bag

5-58. The A-22 cargo bag has a maximum capacity of 2,200 pounds.

## Slingload Theory

5-59. The behavior of an external load in flight can greatly affect the performance of the aircraft carrying it. High drag coefficients reduce airspeed. This means that the task takes longer or does not get finished if the allotted time for the task expires. Therefore, whoever prepares the load must try to reduce the drag of the load on the aircraft. A high drag coefficient can also endanger the aircraft and crew. Because of this, the pilot must "punch" if he thinks that continuing to fly the load could endanger his crew or aircraft. To stabilize a load, the loaders should consider the following:

## Addition Of Weight To The Load

5-60. The heavier a load, the less air pressure will disturb it. Thus, carrying heavier loads assures greater stability. However, make sure the load does not exceed the rated capacity of the equipment or the ACL of the aircraft.

## Streamlining Of The Load

5-61. Long, symmetrical loads fly crosswise to the direction of flight.

This causes a lot of drag on the aircraft. Loads tend to stabilize if the center of gravity (CG) is located in the first one-third of the load. Either adjust the load or, if needed, add weight to move the CG toward one end or the other. The heavier end of the load will "seek" the direction of flight and the load will stabilize. The lighter tail end of the load will act just like the fins on a dart.

## Airspeed Of The Aircraft

5-62. The least desirable method is to have the aircraft fly slow to try to keep the load from destabilizing. This burns extra fuel and takes more time to do less work. Prepare the loads so that the aircraft can fly safely at speeds of 60 knots or more.

## Sling Length

5-63. Lengthening the slings that attach the load to the aircraft reduces the load's stability in flight. The shorter, the better, as long as the sling measures at least 6 feet long. Also, the more vertical the attached sling, the less stress on those that are more horizontal. Figure 5-16, page 5-22, shows how sling angle affects load stress.

## Effect Of Vertical Sling

5-64. A vertical sling carrying 3,000 pounds has 3,000 pounds of stress on it. That means the stress equals the weight of the load.

## Effect Of 45-Degree Sling

5-65. A 45-degree sling carrying 3,000 pounds has 4,242 pounds of stress on it. That means the stress equals nearly one-and-a-half times the weight of the load.

## Effect Of 5-Degree Sling

5-66. A 5-degree (almost horizontal) sling carrying 3,000 pounds has 34,419 pounds of stress on it. That means the stress equals more than ten times the weight of the load.

## Hookup And Release Procedures

5-67. Hooking up a load requires a team effort. The signalman must position the aircraft over the load. He does this so the slingload team can discharge the static electricity and attach the load to the aircraft as quickly and safely as possible. Most of the time, the air crew releases the load. This seldom requires any ground crew except the signalman.

## Ground Crew Protective Measures And Equipment

5-68. Working around hovering helicopters exposes ground crews to a variety of dangers. Leaders must do everything they can to ensure the safety of the ground crews. The crews themselves should use the following safety equipment (Figure 5-17).

## Helmet

5-69. This protects the wearer from head injuries caused by flying debris. It also protects him if his head were to get caught between the aircraft and the load, for example. Wearers must keep helmets securely fastened.

## Protective Mask Or Dust Goggles With Respirator

5-70. In high dust or debris environments, each crewmember wears a mask or goggles. This protects the crewmembers' faces, eyes, and respiratory systems from the airborne particles stirred up by the rotor wash. The mask protects better than the goggles but can cause problems with depth perception (important for signalmen).

## Earplugs Or Suitable Substitute

5-71. These protect against the excessive noise associated with hovering aircraft. They also prevent debris from entering the ear canal.

## Hand Protection

5-72. Marine Corps and Navy personnel must wear gloves designed to protect electrical workers against burns due to static discharges. Everyone else (US Army, USAF, and USCG) should wear leather gloves to help protect the hands and fingers. Whoever must use the static wand to discharge static electricity should wear gloves designed for adequate protection from static discharge burns.

-  Inspect shockproof gloves before and after each operation. Check
for excessive wear, fraying, holes, and tears. Do not use a torn glove. Even a small hole leaves a person unprotected from static
electric shock.
-  Check each glove for holes by filling it with water and squeezing it
while holding the open end closed. Or, blow air into it like a balloon and submerge it in water. Any holes will cause air bubbles.

## Static Discharge Wand

5-73. The static discharge wand protects the hookup man from electrical shock by grounding the cargo hook. In flight, the helicopter stores static electricity. This electrical charge increases with the weight of the helicopter, with low humidity, and with the amount of debris blown around by the rotor system (dust, sand, or snow). Thunderstorms can cause huge discharges of static electricity. When the helicopter lands and touches the ground, this charge grounds. However, while the helicopter remains airborne, such as when it hovers to make a slingload drop, the charge stays in the aircraft. As soon as the ground-crew member connects the apex fitting to the cargo hook, he becomes a path for an electrical charge to follow into the ground. This charge can cause severe electrical burn or injury.

-  To avoid the possibility of a static electric shock, ground the cargo
hook (connect the helicopter to the ground) using grounding stakes and static discharge wands. (The stakes and wands may be fieldexpedient or manufactured.) Because these wands connect the helicopter to the ground, the electric charge dissipates. This protects the hookup man from receiving a shock when he connects the apex fitting to the cargo hook.
-  Inspect the static discharge wand to make sure it is in serviceable
condition. Drive the grounding stake opposite the ground crew's
exit direction. This keeps them from tripping on the cable as they
leave.
-  Drive the stake into the ground until it seats firmlyat least 6 to 8
inches in firm ground and 24 inches in sandy or loose soil. Drive the stake in at a 45-degree angle away from the side of the load, in case someone falls on it. Connect the cable clamp to the vertical shaft of the stake.
-  When operating on concrete or asphalt surfaces, position the loads
as close to the edge of the surface as you can. This allows you to drive the grounding stake into the ground.
-  Do not hold the static discharge wand within 14 to 16 inches of the
metal hook enda strong static charge can jump as far as 12 inches. During the hookup operation, the static discharge wand must stay in contact with the cargo hook. If contact fails, all ground-crew members must pull back from the hook until someone can reestablish contact between the wand and the aircraft's cargo
hook.

## Other Equipment

5-74. Use smoke grenades to mark the location of the landing site or to indicate wind direction. Use flashlights with wands to give arm-andhand signals at night.

## Safety

5-75. In addition to using the proper equipment, Soldiers must also follow these other safety measures:

-  Wear long-sleeved shirts with the sleeves rolled down and fastened.
Button your shirt collar. Tuck shirttails or jacket bottoms into your trousers.
-  Police the operational area thoroughly before conducting slingload
operations. This cuts down on the amount of debris thrown about by rotor wash.
5-76. Stay alert during hookup and release operations; sound judgment and common sense hold the keys to success. Stay ready to get clear of the load. Soldiers have been crushed between the aircraft and loads. Some have had loads dragged over them; others took an unwanted ride when they somehow entangled themselves with the load. Whenever you have to make the hookup, take special care. Slings under tension can easily crush an arm or leg against the load. Some of the particular hazards associated with loads include

## Cargo Extensions Or Projections

5-77. Gun tubes, landing gear, missile launchers, bridge planks, and so forth can interfere with or injure you by striking or tripping you. Stand clear of such projections or position yourself so you can clear the load at once.

## Sharp Projections, Hooks, Handles, Racks

5-78. If possible, avoid these. Examples include protruding handles or levers such as tarpaulin tie-down hooks, door handles, spare-tire racks, and similar projections. Sharp edges can cause serious injury. You can quickly get hooked to the load if your clothing or equipment catches on something. Keep alert and ready to move out of danger immediately.

## Top-Heavy Or Narrow-Based Loads

5-79. Treat with caution any top-heavy or narrow-based loads that the rotor wash could blow over. If possible, lay this kind of load on its side before starting the hookup. If you cannot do this, position the crew on the side or end of the load that is least likely to tip. Again, stay ready to move away from the danger quickly.

## High Loads

5-80. High loads can seriously injure you if you climb up on them to hook them up. Rotor wash can sweep you off, or you might have to jump to avoid a dangerous situation. Pay attention to where you stand. Try to stand on a lower projection or step rather than on top of the load. This way, if the aircraft makes contact with the load, it does not catch you in between. Also, try to work from a crouched position or from your hands and knees. Keep solid footholds and handholds, and stay ready to move quickly out of the way if you need to. If possible, back a vehicle up to the load and use it as a working platform. (Move it out of the way before the aircraft starts to lift the load.)

## Ground Crew Emergency Conduct

5-81. When an aircraft hovering over a slingload suffers an emergency severe enough for the pilot to have to set the aircraft down, he will do so. This can happen all at once such as in a controlled crash. For this reason, whenever an aircraft seems to be having trouble, all members of the ground crew should clear the slingload point by moving to a location coordinated with the aviation unit. Once they have moved far enough away, they should each take a prone position or seek cover until the aircraft lands. Two responsibilities require special note:

## Signalman

5-82. Face the aircraft; move to a safe spot.

## Hookup Men

5-83. Try to work along the same side of the load as your assembly area, or as coordinated. This way, you do not have to climb over or go around the load to seek safety. You can instead move directly off and away from the load. If the load is a heavy piece of equipment, you might want to keep the load between you and the aircraft while you are moving. This offers you some protection if the aircraft were to crash.

## Ground Crew Duties

5-84. Normally, the ground crew consists of one signalman and two hookup men, with one hookup man acting as static wand man.

## Signalman

5-85. Duties of the signalman include the following.

## Before The Aircraft Arrive(S)

5-86. Direct the positioning of the load. Supervise the inspection of the load for proper routing of the slings and proper preparation. Ensure that the load is ready to fly.

## As The Helicopter(S) Approaches

5-87. Station yourself 20 meters in front of the load where you can best maintain eye contact with the crew. Give the arm-and-hand signal of "assume guidance." As the helicopter nears the load, use arm-and-hand signals to position the cargo hook directly over the load, close enough that the hookup men can place the apex fitting onto the cargo hook. During this time, position yourself so the pilot can see your signals easily. Because the pilot of an Army aircraft sits on the right side of the aircraft, you will usually stand just to the right of the aircraft. If the terrain forces you to stand somewhere else, make sure the pilot can see you at all times.

## During The Hookup Process

5-88. Watch the cargo hook and apex fitting. After hookup, the pilot hovers the aircraft until the hookup men clear away from the load.

When they have moved clear, you will signal the aircraft upward slowly, so the sling legs gradually take up the load. You must do this to make sure the sling legs clear the load. If the sling legs foul, motion the pilot downward, and then instruct him to cut away the load. If you did a good job of hooking up the load, and if the load suspends properly below the aircraft, then give the aircraft the signal to depart. Then move quickly aside to clear the helicopter's path.

## Danger At No Time Will The Signalman Or Any Other Member Of The Slingload Team Allow A Suspended Load To Pass Over His Head. Hookup Men

5-89. Duties of the hookup men include the following:

-  One of you handles the static discharge wand and the cargo hook.
The other controls the apex fitting of the slingload. Together, you must complete the hookup fast to reduce helicopter hover time and to reduce your exposure time under the helicopter.
-  Position yourselves by the load so that, while the helicopter hovers
over the load, you can quickly complete the hookup (Figure 5-18). You must also make sure the signalman can continually observe the operation.
-  When the helicopter moves into the correct position for hookup,
whichever one of you is the static wand man must ground the aircraft. Touch the static wand to the cargo hook (Figure 5-19, page 5-28) and keep it there to maintain a continuous ground.
-  Once the static wand man grounds the aircraft, the other hookup
man places the apex fitting onto the cargo hook, then checks to
make sure that the hook is properly closed (and locked, if required).
-  After you properly hook up the load to the aircraft, both of you
must move quickly aside to the location coordinated with the aviation unit. If the signalman learns that any of the legs have fouled, he notifies the pilot at once. Also, you will have to rehook the load.

## Release Procedures

5-90. For this mission, leaders refer to the hookup men as the "cargo release team." As the helicopter approaches the site, the pilot takes instructions from the signalman, who guides the aircraft into position for cargo release. The cargo release team stands by, unless it must release the load manually. The signalman directs the aircraft to set the load on the ground. He gives the release signal. At this time, the apex fitting should fall free of the cargo hook. If it does not, the signalman has the aircraft hover, then he directs the cargo-release team to move under the helicopter and manually release the load from the hook. The load clears the hook. After the release, everyone moves out from under the aircraft. The signalman directs the aircraft to depart and quickly moves out of its path. If the pilot cannot activate the cargo hook from within the helicopter, and if cargo release personnel open it, then ground-crew members must use the following emergency cargo release procedures:

-  If a donut ring or basket hitch is used, try to disassemble the apex/
donut. Pass the pin/ADS through the hook.
-  If the cargo hook is attached to a clevis or apex fitting, unscrew the
nut on the clevis or fitting and remove the pin.
-  If necessary, derig the load so the aircraft can set down.

## Hookup Procedures During Whiteouts Or Brownouts

5-91. The hazards of these conditions (snow or dust) prevent the use of a signalman or a hovering hookup.

-  Rig the load with a 20-foot or a 40-foot extension (as required)
using 20-foot ADS with two or three loops and the appropriate number of type IV link assemblies. Place an apex fitting at the end of the extension.
-  Lay the extension to the left of the load. The aircraft approaches
normally, then taxis to the location of the apex fitting and stops.
Once the aircraft lands, the hookup person moves to the aircraft
and attaches the apex fitting to the cargo hook. The aircraft suspends the load and departs as directed by the GTA.
-  When attaching the extension to skid-equipped helicopters, such as
the UH-1H, take care that the sling goes forward of but not through the skid. Then attach it to the cargo hook.

## Warning

Before the operation begins, coordinate the
ground crew's evacuation route to a rendezvous
point. Proper coordination with the liaison officer
or helicopter crew prevents confusion. Helicopter
emergency procedures depend on terrain, wind
direction, and pilot choice. Good coordination
also prevents the helicopter and ground crews
from moving in the same direction.

## Slingload Inspection Record

5-92. To improve slingload safety, the Department of the Army implemented inspection procedures for all Army equipment moved by the slingload method of air delivery. These procedures went into effect 1 October 1997. All Army loads require inspection by a qualified inspector before the arrival of the supporting aircraft. The inspector completes the Slingload Inspection Record. (Figure 5-20, page 5-30, shows an example completed DA Form 7382-R, *Sling Load Inspection Record*.) This form is used to inspect all loads, to include nonstandard, or unique, loads. The commander with high risk approval authority (usually the first colonel in the chain of command) is the approval authority for a nonstandard load, and will be annotated in the remarks block of the DA Form 7382- R.

## Inspector Qualifications

5-93. Inspectors must hold the grade of E-4 or more. They must also either be a pathfinder, a slingload inspector course graduate, or air assault- qualified.

## Distribution Of The Slingload Inspection Record

5-94. Reproduce the slingload inspection record onto 8 1/2 by 11-inch paper, get it through official distribution channels, or download it from the AEL. Complete the inspection record in triplicate. Copies of the completed form are distributed as follows:

-  Give a copy to the supporting aviation unit. -  Securely tape or tie a copy to the load. -  Give a copy to the supported unit.

## Chapter 6 Drop Zones

The ground unit commander designates the drop zone, usually with the drop zone support team leader's (DZSTL's) technical help. The drop zone is where drop aircraft deliver personnel and equipment by parachute or free drop. The commander selects a DZ location that best supports the tactical plan. In the case of tactical training, the commander checks the USAF assault zone availability report (AZAR) to see if an approved DZ already exists within the tactical area. If the AZAR does not include a DZ in that area, the commander must assess the tactical situation before choosing a DZ location.

## Section I. Selection Factors

The commander uses the drop zone selection factors discussed in this section to analyze the suitability of a drop zone.

## Airdrop Airspeeds

6-1. The speed of the aircraft (airspeed) determines how long the aircraft will remain over the drop zone. Table 6-1 shows airspeeds for rotary-wing aircraft in knots indicated airspeed (KIAS). Table 6-2, page 6-2, shows the same thing, but for fixed-wing aircraft, by aircraft type and load.

| Type of Aircraft   | Airspeeds                  |
|--------------------|----------------------------|
| UH-1 Huey          | 50 to 70 knots (optimum 70 |
| knots)             |                            |
| UH-60 Blackhawk    | 65 to 75 knots (optimum 70 |
| knots)             |                            |
| CH-46 (USMC)       | 80 to 90 knots             |
| MH-53 (USAF)             | 80 to 110 knots (optimum 90   |
|--------------------------|-------------------------------|
| knots)                   |                               |
| CV-22 Osprey (USAF)      | 80 to 110 knots (optimum 90   |
| knots)                   |                               |
| CH-47                    | 80 to 110 knots (optimum 90   |
| knots)                   |                               |
| CH-46/53 (USMC)          | 80 to 110 knots (optimum 90   |
| knots)                   |                               |
| CH-54 Skycrane           | 65 to 75 knots (optimum 70    |
| knots)                   |                               |
| CH/HH3 (USAF)            | 70 to 90 knots                |
| MC-130 Combat Talon I    |                               |
| and II                   |                               |
| 70 to 90 knots           |                               |
| C-130/141/17/5           | 130 to 135 knots (personnel/  |
| door bundles)            |                               |
| C-7A Caribou             | 90 to 120 knots               |
| C-27A (Aeritalia G-222)  | 125 knots                     |
| C-46 Commando/C-47       |                               |
| Sky Train                |                               |
| 104 to 125 knots         |                               |
| DC-3 (Contract Aircraft) | 104 to 125 knots              |
| CASA-212                 | 90 to 110 knots               |
|                                       | Type of Load   | Airspeeds   |
|---------------------------------------|----------------|-------------|
| C-17                                  | C-130          | C-141 or    |
| C-5                                   |                |             |
| 130 to 135                            |                |             |
| (130 is                               |                |             |
| ideal)                                |                |             |
| Personnel Static Line                 | 130            | 130 to      |
| 135                                   |                |             |
| (130 is                               |                |             |
| ideal)                                |                |             |
| Personnel HALO and HAHO               | 110 to 150     | 130 to      |
| 180                                   |                |             |
| 138 to 145                            |                |             |
| Container delivery system combination |                |             |
| and Equipment                         |                |             |
| 130 to 140                            |                |             |
| (See note)                            |                |             |
| 150                                   | 140 to 150     |             |
| Heavy equipment                       | 140            | 150         |
| Free fall (free drop)                 | 140            | 150         |
| High velocity CDS                  | 130 to 140   |
|------------------------------------|--------------|
| (See note)                         |              |
| 150                                | 140 to 150   |
| Wedge                              | 130 to 140   |
| (See note)                         |              |
| 150                                | 140 to 150   |
| Ahkio sled                         | 130 to 140   |
| (See note)                         |              |
| 150                                | 140 to 150   |
| Combat rubber raiding craft (CRRC) | 130 to 140   |
| (See note)                         |              |
| 150                                | 140 to 150   |
| 130 to 135                         |              |
| (130 is                            |              |
| ideal)                             |              |
| Door bundle                        | 130          |
| 135                                |              |
| (130 is                            |              |
| ideal)                             |              |
| Not                                |              |
| applicable                         |              |
| Simulated airborne training bundle |              |
| (SATB) (does not apply to C-17)    |              |
| Use same                           |              |
| load as for                        |              |
| actual drop                        |              |
| Use                                |              |
| same                               |              |
| load as                            |              |
| for                                |              |
| actual                             |              |
| drop                               |              |
| High Speed, Low-Level, Aerial      |              |
| Delivery System (HSLLADS)          |              |
| En route                           |              |
| airspeed                           |              |
| Note:                              |              |
| Use this type of load when         |              |
| gross weight exceeds 120,000       |              |
| pounds. For combination            |              |
| drops, use the higher airspeed     |              |
| KIAS. (A combination drop          |              |
| exists when the same or            |              |
| different type aircraft drop       |              |
| different types of loads in the    |              |
| same pass over the DZ.)            |              |

## Drop Altitude

6-2. The DZSTL measures drop altitude in feet AGL (Table 6-3) from the highest point on the DZ (the highest field elevation) to the aircraft. In combat (wartime) operations, airborne and airlift commanders jointly determine drop altitudes. Table 6-4 shows drop altitudes, by load and aircraft type, in feet AGL.

| 800                                     | Feet AGL   |
|-----------------------------------------|------------|
| in DZ to desired altitude of aircraft,  |            |
| in feet.                                |            |
| +550 Feet field                         |            |
| elevation                               |            |
| B Highest field elevation in feet above |            |
| sea level, rounded up to next 50 (for   |            |
| example, round 505 up to 550).          |            |
| C Drop altitude in feet indicated.      | 1,350 Feet |
| indicated                               |            |

6-3. Table 6-4 shows airdrop altitudes for different types of training missions. (For more information on drop altitudes, see AFI 11-231 and AFI 11-410.) 6-4. The aircraft altimeter displays altitude in feet indicated (feet above sea level), not in AGL (feet above the highest point on the ground). Thus, the pilot might request the drop altitude in "feet indicated." You can calculate this simply by following this example:

-  Obtain the drop altitude, that is, the distance in feet from the
highest point on the drop zone (field elevation) to the desired altitude of the aircraft. In this example, drop altitude equals 800 feet (A, Table 6-3).
-  Obtain the highest field elevation in feet above sea level. Round
this number up to the nearest multiple of 50 (round 537 up to 550, for example) (B, Table 6-3). For purposes of obtaining the drop altitude in feet indicated, use this number for field elevation.
-  Sum the two numbers you obtained to yield drop altitude in feet
indicated (C, Table 6-3).

| Type of Load                        | Time of Day (Light   |
|-------------------------------------|----------------------|
| Conditions)                         |                      |
| Rotary Wing                         |                      |
| Aerial                              |                      |
| Delivery                            |                      |
| Altitudes                           |                      |
| 1,500 Feet                          |                      |
| AGL                                 |                      |
| Personnel                           | Day or Night         |
| (includes limited                   |                      |
| visibility)                         |                      |
| Bundles                             | Day                  |
| Night (includes limited visibility) | 500 Feet AGL         |
| Note:                               |                      |
| If the rotary wing aircraft is      |                      |
| flying 90 KIAS or faster,           |                      |
| then it can drop personnel          |                      |
| as low as 1,250 feet AGL.           |                      |
| Type of Load                        | Fixed Wing Aerial    |
|-------------------------------------|----------------------|
| Delivery Altitudes                  |                      |
| Planning                            | 1,000 feet AGL       |
| Combat operations (war)             | Determined jointly   |
| by airborne and                     |                      |
| airlift commanders                  |                      |
| Tactical training                   | 800 feet AGL         |
| Basic airborne training             | 1,250 feet AGL       |
| HALO (minimum opening)              | 2,500 feet AGL       |
| Simulated airborne training bundle- |                      |
| personnel (SATB-P)                  |                      |
| 500 feet AGL                        |                      |
| Tactical training bundle (TTB)      | Use drop altitude of |
| simulated load                      |                      |

## Type Of Load

6-5. The type of load is considered when estimating the drop zone time requirement, or how many bundles or personnel can be exited in a single pass over the drop zone. This is a consideration as a commander may request a DZ capable of exiting a certain amount of jumpers in a single pass, or may need to know how many jumpers can exit over a preselected DZ. For personnel, allow one second for each jumper after the first. For example, ten jumpers minus the first jumper equals nine jumpers. Multiply nine times one second. Allow nine seconds for all ten jumpers to get out the door. For equipment, allow three seconds for each door bundle after the first. For example, five bundles minus the first bundle equals four bundles. Multiply four times three seconds each. Allow twelve seconds to get the equipment out the door. There is no set time to wait between exiting bundles and personnel. However, the jumpmaster team must ensure all bundles have exited the aircraft, and that no unsafe conditions exist, before they start exiting personnel IAW Chapter 10 of FM 3-21.220. Bundles and personnel must never exit at the same time.

## Danger

Never allow personnel and bundles to exit the aircraft at the same time.

6-6. For container deliver system (CDS) and heavy equipment, the time requirement is already factored into the minimum computed air release point (CARP) DZ sizes found in AFI 13-217.

## Methods Of Delivery

6-7. The type of airdrop determines method of delivery. The three methods are low-velocity, high-velocity, and free-drop trips. The method then normally determines the location of the control center. Table 6-5 shows the minimum airdrop altitudes, by aircraft, load, and parachute type.

## Usaf Fixed-Wing Aircraft: Door Bundles

Altitude for C-130
Type of Parachute
Altitude for C-5, C-17, and C-141
G-14
300 feet AGL
300 feet AGL
T-10 cargo
300 feet AGL
400 feet AGL
C-5, C-17, C-141: Container Delivery System
Airdrop Altitude
Type of Parachute
Number Parachutes or Containers
Planning drop altitude
NA
600 feet AGL 475 feet AGL
G-12D
Single canopy 1 to 6 containers
7 or more containers
575 feet AGL
2 or 3 parachutes
525 feet AGL
425 feet AGL
G-12E
Single canopy 1 to 40 containers (130 KIAS) 375 feet AGL
Single canopy 1 to 40
containers (140 to 150
KIAS) 2 or 3 parachutes
550 feet AGL
| G-14                         | 1 or 2        |
|------------------------------|---------------|
| containers                   |               |
| 300 feet AGL                 |               |
| 3 containers                 | 400 feet AGL  |
| 12- to 22-foot high-velocity |               |
| ring-slot parachute          |               |
| NA                           | 100 feet plus |
| vertical                     |               |
| distance for                 |               |
| the load                     |               |
| being drop                   |               |
| 26-foot high-velocity ring-  |               |
| slot parachute               |               |
| NA                           | 100 feet plus |
| vertical                     |               |
| distance for                 |               |
| the load                     |               |
| being drop                   |               |
| SATB-C                       | NA            |
| parachute                    |               |
| type being                   |               |
| simulated                    |               |

## C-130: Container Delivery System

Airdrop Altitude
Type of Parachute
Number Parachutes or Containers
600 feet AGL
Planning drop altitude
Single canopy 1 to 6 containers
G-12D/E
7 or more containers
400 feet AGL
G-12D
2 or more parachutes
600 feet AGL
2 or more parachutes
600 feet AGL
G-12E
2 or more parachutes
550 feet AGL
CRRC (G-12D/E)
NA
600 (boat only) otherwise use personnel
drop
G-14
1 or 2 containers
400 feet AGL
3 containers
500 feet AGL
12- to 22-foot high-velocity ring-slot parachute
NA
100 feet plus vertical distance for the load being drop
26-foot high-velocity ringslot parachute
NA
100 feet plus vertical distance for the load being drop
SATB-C
NA
See parachute type being simulated

## C-5, C-17, C-141, C-130: Heavy-Drop Equipment

Altitude for
C-130
Altitude for
C-5, C-17,
and C-141
Type of Parachute
Cluster Size
(Number of
Canopies or Bundles)
Planning drop altitude
NA
1,100 feet AGL
1,100 feet AGL
G-12D
NA
650 feet AGL 2 to 3
parachutes 650 feet AGL
G-12E
NA
550 feet AGL 2 to 3
parachutes 550 feet AGL
G-11A
1
900 feet AGL 900 feet AGL
2 to 7
1,100 feet AGL 1,100 feet
AGL
8
1,300 feet AGL 1,300 feet
AGL
G-11B
1
700 feet AGL 700 feet AGL
2 to 4
750 feet AGL
750 feet AGL
5 to 7
1,100 feet AGL
8
1,300 feet AGL
G-11C/X
1 to 2
975 feet AGL 1,050 feet
AGL
| 3 to 4     | 1,025 feet AGL 1,100 feet   |
|------------|-----------------------------|
| AGL        |                             |
| 5          | 1,075 feet AGL 1,150 feet   |
| AGL        |                             |
| 6 to 7     | 1,125 feet AGL 1,200 feet   |
| AGL        |                             |
| 8          | 1,225 feet AGL 1,300 feet   |
| AGL        |                             |
| SATB-H     | NA                          |
| parachute  |                             |
| type being |                             |
| simulated  |                             |
| See        |                             |
| parachute  |                             |
| type being |                             |
| simulated  |                             |

NOTES:
1. Combination drops use
the highest airdrop altitude. A combination
drop exists when either
of the following occurs:
*  When different
aircraft drop different types of loads in same pass over DZ.
*  When different type
loads exit same aircraft in same pass over DZ.
4. Minimum airdrop altitude
for heavy equipment using the 5,000-pound parachute release is 1,000 feet AGL or by parachute type, whichever is higher.

## Low-Velocity Airdrop

6-8. Low-velocity airdrops are used for sensitive equipment and personnel. The parachute slows the rate of the descent to prevent damage to equipment or injury to personnel.

## High-Velocity Airdrop

6-9. High-velocity airdrops are used to deliver certain supply items. The load must be rigged in an airdrop container with an energy dissipater attached to its underside and a ring-slot parachute attached to the top. The chute stabilizes the load and reduces the rate of fall, ensuring an acceptable landing shock.

## Free Drop

6-10. Free drops are used for nonsensitive items only. This type of load has no parachute to stabilize or slow its rate of descent. Loads may require special packaging to prevent damage from impact.

## Added Risk

6-11. When determining the suitability of the DZ and considering the method of delivery around populated or built-up areas or airfields, the pathfinder also considers the added risk of injury to personnel or damage to buildings when using high-velocity or free-drop methods.

## Obstacles

6-12. To ensure a safe airdrop, and to ensure Soldiers can recover and employ airdropped personnel and equipment, the ground unit commander should assess the risks of obstacles on the DZ and adjacent areas.

## Obstacles To Personnel

6-13. This includes anything, natural or manmade, that could harm a parachutist or prevent mission accomplishment.

## Obstacles To Equipment

6-14. This includes anything, natural or manmade, that could damage or hinder the recovery of equipment.

## Trees

6-15. Trees 35 feet (which is the distance from the top of a personnel parachute to the harness) or higher that would impede recovery of personnel or equipment present an obstacle.

## Water

6-16. Water at least 4 feet deep and 40 feet wide, and within 1,000
meters of any edge of the surveyed DZ is an obstacle.

## Power Lines

6-17. Power lines carrying 50 or more volts can kill a jumper.

## Danger

Set up the DZ away from power lines. A 50-volt shock can kill a jumper. Even if it does not, it could cause him to fall, and that could kill him.

6-18. Try to site the DZ at least 1,000 meters from a power line. If you cannot, and a power line is located within 1,000 meters of any boundary of the DZ, then you must coordinate with the local power company to shut off the power to that line NLT 15 minutes prior to TOT. If this is not possible, then the flying mission commander, aircrew, and jumpmaster must assess the risk. They should consider at least the following:

-  Type of jump. -  Jumpers' experience. -  Aircrew's experience. -  Ceiling. -  Surface and altitude wind limits required to approve, suspend, or
cancel.
6-19. To further minimize risks, they should consider how they might alter the mission profile to raise or lower drop altitudes, change the DZ run-in or escape headings, or remove inexperienced jumpers from the stick. Also, if they can, they should clearly mark power lines with lights, smoke, or VS-17 panels.

## Danger

Set up the DZ away from power lines. A 50-volt shock can kill a jumper. Even if it does not, it could cause him to fall, and that could kill him too. Also, never try to climb power line poles to position or affix markings to the poles or the lines themselves.

6-20. Figure 6-1 shows an example safety zone for when power lines fall within 1,000 meters of the drop zone.

## Other Obstacles

6-21. This includes anything else, such as barbed wire fences, swamps, rocks, ditches, steep inclines, or gullies, that could injure parachutists, damage or prevent the recovery of equipment, or interfere with the mission.

## Access

6-22. Ground unit commanders should avoid any DZ that has a major obstacle between it and the objective area. Ground unit commanders should also make sure the area has adequate routes to conduct troop movement and to recover equipment.

## Size

6-23. Ground unit commanders must use the following minimum peacetime drop zone sizes for fixed wing aircraft, unless a waiver is issued. During wartime and contingency operations, the commander at the appropriate level may waive the DZ size. AFI 13-217 provides information about waivers.

## Computed Air Release Point

6-24. The USAF prescribes the sizes of computed air release point DZs during peacetime drop operations.

## Heavy Equipment

6-25. The minimum CARP DZ size (Table 6-6, top section) measures at least 600 yards (549 meters) wide by 1,000 yards (915 meters) long for one platform. Add 28 meters (30 yards) to the length and width for each
100 feet above 1,100 feet.

## Personnel

6-26. Table 6-6, bottom section, shows the CARP DZ size for personnel. The CARP DZ size for one jumper is at least 549 meters (600 yards) by 549 meters (600 yards). For each additional jumper, add 64 meters (75 yards) to the length of the DZ.

## Heavy Equipment

| Altitude (Agl In Feet)   | Width      | Drop   |
|--------------------------|------------|--------|
| Zone                     |            |        |
| Length                   |            |        |
| One Platform             | Additional |        |
| Platforms                |            |        |
| To 1,100                 | 600 Yards  | 1,000  |
| Yards                    |            |        |
| Add 400 yards            |            |        |
| (C-130) or 500           |            |        |
| yards (C-17 or           |            |        |
| C-5) to trailing         |            |        |
| edge for each            |            |        |
| additional               |            |        |
| platform.                |            |        |
| Above 1,100            | Add 30 yards to   |
|------------------------|-------------------|
| DZ width and           |                   |
| length for each        |                   |
| 100 feet above         |                   |
| 1,000 feet (Add        |                   |
| 15 yards to            |                   |
| each side of the       |                   |
| DZ).                   |                   |
| Personnel              |                   |
| Altitude (Agliin Feet) | Width             |
| Zone                   |                   |
| Length                 |                   |
| One Platform           | Additional        |
| Platforms              |                   |
| To 1,000               | 600 Yards         |
| Yards                  |                   |
| Add 75 yards to        |                   |
| trailing edge for      |                   |
| each additional        |                   |
| parachutist.           |                   |
| When using             |                   |
| CAPES, add             |                   |
| 100 yards each         |                   |
| instead.               |                   |
| Above 1,000            | Add 30 yards to   |
| DZ width and           |                   |
| length for each        |                   |
| 100 feet above         |                   |
| 1,000 feet (Add        |                   |
| 15 yards to            |                   |
| each side of the       |                   |
| DZ).                   |                   |

NOTES:
1. For day visual formations,
increase width by 100 yards (50 yards each side). For SKE formation, increase width by 400 yards (200 yards each side). Official sunset to sunrise, increase width by 100 yards for single ship visual drops (50 yards each side) or 200 yards for visual formations (100 yards each side).
2. Official sunset to sunrise,
increase length by 100 yards for visual drops (50 yards each end).
3. For personnel formations,
minimum DZ basic width using center PIs is 1,240 yards for 2-ship elements and 1,800 yards for 3-ship elements. When using offset PIs, minimum basic width is 1,100 yds for 2- ship elements and 1,300 yds for 3-ship elements.

## Container Delivery System

6-27. Table 6-7 shows the CARP DZ sizes for the container delivery system.

## Additional Size Requirements

6-28. For each additional platform on a C-130, add 366 meters (400 yards) to the length of the DZ. For each additional platform on a C-17, C-5, or C-141, add 458 meters (500 yards). For multiple aircraft not flying in trail formation, add 100 yards to the width of all CARP DZs. From official sunset to sunrise, add 100 yards to the length and width of all CARP DZs. For SKE formations, increase the width by 400 yards. For SKE formation, you need not add the 100 yards when the aircraft are not flying in trail. 6-29. For C-17s flying in personnel formations, the minimum width for a basic DZ, using center PIs, is 1,240 yards for two ship elements, or 1,800 yards for three ship elements. When using offset PIs, the minimum width is 1,100 yards for two ship elements, and 1,300 yards for three.

Note: Multiply yards by 0.9144 to convert them to meters;
divide meters by the same number to convert them to yards.

## Army Virs And Gmrs Drop Zones

6-30. For the verbally initiated release system (VIRS) and for the ground-marked release system (GMRS), allow a minimum size of 300
yards by 300 yards (275 meters by 275 meters). To determine the required size of Army VIRS DZs, use the D=RT formula (Figure 6-2). For personnel jumps, allow a 100-meter buffer zone at the leading and trail edges of the DZ. If local regulations permit, the local commander can waive these buffer zones.

## Parachutists Or Bundles

6-31. To calculate the maximum number of either parachutists or bundles that a GMRS or VIRS DZ of given length can accept in one pass, use the T=D/R formula (Figure 6-3). You must know the type of aircraft and drop speed, and type of exit. The T=D/R formula may also be used to calculate the same information for a CARP DZ. In this case, measurement is from the PI to the trail edge of the DZ, minus the buffer zone (personnel only). Minimum length for CARP DZ is 3 seconds. In all cases, once the PI is established, the DZ time must be recalculated from the PI to trail edge, minus the required buffer.

## Load Drift Under Parachute

6-32. To calculate the amount of drift experienced by a load under a parachute, use the D=KAV formula (Figure 6-4). Always round up to the next whole number.

## Wind

6-33. Measuring wind on the drop zone entails measuring both surface wind and mean effective wind. Use an authorized wind-measuring device to measure surface (ground) wind speed, especially for personnel and heavy equipment operations. 6-34. Mean effective wind (MEW) refers to the average wind from ground level to drop altitude. Measure the magnetic azimuth to the balloon and note the reciprocal heading. This gives you the MEW direction to report. Use the pilot balloon (PIBAL) to measure MEW. PIBAL circumferences include

-  10 grams for day57 inches. -  30 grams for day75 inches. -  10 grams for night74 inches.
-  30 grams for night94 inches.
6-35. At night, attach a small, liquid-activated light or 6-inch chem-light to the balloon to aid in observation. Table 6-8A (this page) and 6-8B
(page 6-16) show the PIBAL charts for the 10- and 30-gram helium balloons, respectively.

## Forward Throw

6-36. This refers to the effect of inertia on a falling object. An object that leaves an aircraft moves at the same speed as the aircraft. The parachutist (or bundle) continues to move in the direction of flight until the dynamics of gravity and the parachute take effect. The forward throw distance is the distance along the aircraft flight path traveled by a parachutist or cargo container after exiting the aircraft, until the parachute fully opens and the load is descending vertically. Forward throw distance for rotary-wing and STOL aircraft equals half the aircraft speed (KIAS), expressed in meters. Table 6-9 shows the forward throw distance from a fixed-wing aircraft.

| Personnel or Door Bundle   | 229 meters (250 yd)   |   229 |
|----------------------------|-----------------------|-------|
| meters                     |                       |       |
| (250 yd)                   |                       |       |
| 229                        |                       |       |
| meters                     |                       |       |
| (250 yd)                   |                       |       |
| Heavy Equipment            | 668 meters (730 yd)   |   458 |
| meters                     |                       |       |
| (500 yd)                   |                       |       |
| 640                        |                       |       |
| meters                     |                       |       |
| (700 yd)                   |                       |       |
| CDS                        | N/A                   |   503 |
| meters                     |                       |       |
| (550 yd)                   |                       |       |
| 663                        |                       |       |
| meters                     |                       |       |
| (725 yd)                   |                       |       |
| TTB                        | N/A                   |   147 |
| meters                     |                       |       |
| (160 yd)                   |                       |       |
| 147                        |                       |       |
| meters                     |                       |       |
| (160 yd)                   |                       |       |
| NOTE:                      |                       |       |
| To convert yards to        |                       |       |
| meters, multiply           |                       |       |
| yards by 0.9144.           |                       |       |
| To convert meters to       |                       |       |
| yards, divide meters       |                       |       |
| by 0.9144.                 |                       |       |

## Approach And Departure Routes

6-37. Ground unit commanders must choose adequate routes for the aircraft to and from the DZs. They consider

-  Enemy situation and location. -  Obstacles to the aircraft such as television towers or high-tension
lines.
-  Terrain higher than the drop zone. -  Adjacent air operations and flight routes. -  No-fly areas.

## Section Ii. Drop Zone Support Team

The drop zone support team plans, establishes, and operates day and night drop zones for personnel and resupply missions flown by fixed-wing and rotary-wing aircraft. The DZST is responsible for accomplishing the mission on the DZ. In operations without the USAF special tactics team, the DZST will shoulder the overall responsibility for the conduct of operations on the DZ. The DZST represents both the airborne and airlift commanders. The DZST leader assumes all the responsibilities normally associated with the USAF STT and the DZSO.

## Organization

6-38. The DZST must have at least two members. It might need more, depending on the complexity of the mission. However, additional team members do not need to be DZSTL qualified. The senior member of the DZST functions as the team leader. He must hold the rank of NCO (sergeant or above in the US Army, E-4 or above in the USAF or USMC), an officer, or the civilian equivalent. He must have completed the appropriate initial training as a DZST member and must satisfy current parent service requirements. To conduct personnel and heavy equipment drops, he must also hold current jumpmaster qualification.

## Missions

6-39. Primary missions of the DZST include wartime CDS drops to battalion or smaller units. They also make peacetime, visual, and meteorological condition drops, with one to three aircraft, for personnel, CDS, and heavy equipment. Secondary missions include wartime drops of brigade-sized or larger units, peacetime drops of C-130, Adverse Weather Aerial Delivery System (AWADS) involving one to three aircraft, or visual meteorological conditions (VMC) drops of four or more aircraft.

NOTE: Any authorized personnel, other than qualified combat controllers, who perform DZSTL duties, are restricted to formation airdrops of four or less aircraft. The only exception is on a military range with active range control.

## Equipment Familiarization

6-40. The DZST leader must know how to use equipment to set up, mark, and operate the drop zone. Depending on the mission, this equipment includes--

## Anemometer

6-41. An anemometer is an instrument used to measure wind velocity. There are currently three types of anemometers approved for use in support of airborne operations: AN/PMQ-3A, DIC and DIC-3, and turbometer. The AN/ML433A/PM and meters that use floating balls or devices in a tube (sensor-based devices) are not authorized for use during personnel or cargo airdrop operations. Other anemometers not tested and recommended for use should be employed only after a command-initiated risk assessment is completed. Regardless of the method or device used to measure the wind on the DZ, the airborne commander must ensure winds fall within the limitations for the type of drop being conducted.

## Messages

6-42. The following USAIS messages authorize several commercially available anemometers for use in drop zone operations:

-  DTG 101000Z Mar 94, Subject: Use of Anemometers During
Airdrop Operations.
-  DTG 212000Z Oct 94, Subject: Use of TurboMeters During Static
Line Airdrop Operations (personnel drops).

## An/Pmq-3A

6-43.

This is a handheld or tripod-mounted omnidirectional anemometer (NSN: 6660-00-515-4339). It is capable of providing wind speed and direction. Because of its size, cost, and weight (10 pounds with all components), it is not ideal for light Infantry units in operational environments. With the trigger pressed down, the correctly oriented anemometer gives wind direction in degrees. It can read the wind from 0 to 15 knots on the low scale, and from 0 to 60 knots on the high scale. The anemometer requires recalibration every six months.

## Dic And Dic-3

6-44. One piece, handheld, compact, lightweight, factory-calibrated devices, these commercially purchased anemometers are approved for use during airborne operations. The DIC and DIC-3 use folding cups to catch the wind and electronically display wind speed, but not direction. During use, it is critical that the cups are fully extended to ensure an accurate reading. The device is omnidirectional and does not need to be oriented with wind direction to provide accurate readings. Post manufacture calibration methods are not available. The DIC and DIC-3 can depict wind data in knots, miles per hour, kilometers per hour, or meters per second. The additional features of the DIC-3 are the ability to display peak wind velocity over a given period, and average wind speed over two time periods. Because the DIC and DIC-3 cannot be calibrated, they must be checked before use by

-  Ensuring fresh batteries are installed. -  Turning on the anemometer in a no-wind condition, such as in a
building or enclosed vehicle. If any reading other than zero is displayed, the device is unserviceable and must be turned in for disposal or returned to the manufacturer.
-  Conducting a three-anemometer check by comparing the wind
reading on three anemometers at the same time under identical
conditions. Discard the anemometer that reads differently then the
other two. This is most accurate if all anemometers are of the same type.

## Turbometer

6-45. This anemometer is stocked under NSN 1670-00-T33-9004. It can also be commercially purchased. It is a small, lightweight, electronic wind speed indicator. It does not display direction, but when turned into the wind, it depicts wind data in knots, miles per hour, meters per second, and feet per second. For the most accurate results, the TurboMeter must be oriented within 20 degrees of the wind direction, with the wind entering the rear of the meter. Because the TurboMeter cannot be calibrated, conduct the same preoperation and threeanemometer check as when using the DIC/DIC-3 anemometer.

## Vs-17 Marker Panel, Aerial

6-46. The two-sided VS-17 marker panel (NSN 8345-00-174-6865) measures 2 feet wide by 6 feet long. One side is international orange. The other side of the panel is cerise (red). Six tie-down points permit attachment to stakes. The short ends in the stowage pocket have three snap fasteners. When folded, the panel's olive drab green should show. Pathfinders should display the panel side whose color contrasts best against the surrounding area.

## Light, Marker, Ground Obstruction

6-47. One BA-200 battery powers this "beanbag light" (NSN: 6230-00-115-9996). Interchangeable, colored plastic domes offer different colors of light. These markers work well in light holes or on the surface. The ground crew secures the markers with tent pegs or by filling the bottom with sand or rocks.

## Raised-Angle Marker

6-48. This locally constructed raised-angle marker (RAM) marks the PI on CARP DZs. It consists of five VS-17 panels. Most rigger units have the ability to construct a RAM (Figure 6-5).

## Whelen Light

6-49. This light attaches to the top of one of two types of batteries originally used with the AN/PRC-77. To place the light into operation, the user seats it on top of the battery. Different colored domes offer different colors of light. The unit buys this light locally. The batteries are as follows:

-  Dry battery BA-4386/U. -  Lithium battery BA-5598/U.

## M-2 Light Baton

6-50. Two BA-30s power this flashlight (NSN: 6230-00-926-4331). Different lenses (stored in the base compartment) change the color of the light. This light works best in a light hole or on top of the ground attached to a tent peg.

## Aerial Marker, Distress

6-51.

This omnidirectional flashing
(strobe)
light
(NSN
6230-00-67-5209) has a very long range. An optional directional cover snaps on top for tactical operations. Other snap-on caps change color and function. The black cap, for example, makes the strobe light invisible except to devices that can "see" infrared.

## Mirror, Emergency Signaling, Type Ii

6-52. Pathfinders can use the signal mirror (NSN 6350-00-105-1252) to signal aircraft by reflected sunlight. The back of the mirror has a set of instructions for proper use and aiming. The signal mirror works even on hazy days. It works in all directionsnot just when the user faces the sunand the intended viewer can see it from as far away as the horizon.

## Pilot Balloon

6-53. Pathfinders use the 10- or 30-gram rubber balloon to measure the mean effective wind. They fill the balloon with helium until the balloon inflates to the specified circumference. National stock numbers for PIBALs follow:

-  NSN 6660-00-663-7933, balloon, meteorological, 10-gram. -  NSN 6660-00-663-8159, balloon, meteorological, 30-gram.

## Lighting Unit

6-54. This light (NSN 6660-00-839-4927) attaches to the PIBAL for night operations. Overinflating the PIBAL compensates for the weight of the light so it can ascend at the same rate as it would without the light. Water or any other fluid will activate the PIBAL's wet-cell battery. Below 50 degrees Fahrenheit, warm water activates the light faster. A 6- inch chem-light may be used as a lighting unit in place of the wet-cell battery.

## Drift Scale

6-55. This slide-type scale uses a 90-degree angle to measure the ascent of the PIBAL. Pathfinders use the drift scale to compute the mean effective wind. The local Training Support Center produces the drift scale. Pathfinders can also use the pocket transit (small enough to carry in a pocket), theodolite (NSN 6675-00-861-7939) with built-in clinometer (NSN 6675-00-641-5735), or the separate clinometer (NSN
6675-01-313-9730).

## An/Prc-119A (Sincgars) Radio

6-56. This man-portable radio (NSN 5820-01-267-9482) allows FM radio contact with aircraft. It also permits navigational aid (NAVAID) for aircraft with FM-homing capabilities. Without power-increasing accessories, it transmits between 4 and 16 kilometers.

## An/Prc-113 (Have Quick) Radio

6-57. This man-portable UHF/VHF AM radio (NSN 5820-01-136-1519) has a quick, jam-resistant, ECCM transceiver. Pathfinders use it for short ranges5 to 16 milesfor tactical, ground-to-ground, or ground-to-air communication.

## An/Prc-117F (Also Known As Rt-1796) Radio

6-58. This man-portable radio can transmit and receive in the 30 to 512 MHz frequency range. Thus, it can be used for FM, AM, and SATCOM communications. With this one radio system, a Ranger radio operator can communicate with any other radio system used in Ranger operations. The 117F operates in three distinct frequency ranges.

-  VHF low band - 30 MHz to 89.99999 MHz. -  VHF high band - 90 MHZ to 224.99999 MHz. -  UHF band - 225MHz to 512MHz. -  110 programmable radio nets.
6-59. The 117F outputs 20 watts of power in the 90 mHz to 400 mHz range and 10 watts in the upper and lower frequency ranges. The 117F
is menu driven. It uses Vinson, ANDVT, Fascinator, and KG-84 embedded encryption. It operates on 26 volts of DC power (VDC), and requires two BA-5590 nonrechargeable batteries. It has one H-250 handset, a VHF blade antenna with a flexible adapter base, a VHF/UHF flex antenna, a KDU remote-control cable, a wide battery box, and the AN/PRC-117F transceiver. It uses the AV-2040 satellite antenna used for SATCOM communications. With batteries installed, the 117F weighs 15.9 lbs.

## Asip Radio

6-60. The ASIP is an FM, VHF, low-radio system with built-in communications security (COMSEC) and a built-in test (BIT). Its frequency range is 30,000 to 87,975 MHz. It can be used man-packed or vehicle-mounted. To power up in manpack configuration requires 13.5
VDC, which is provided by a single BA5590 battery. In vehicular mode, it operates on 27.5 VDC, which it draws the vehicle's battery. Four power settings include LOW (200 to 400 meters), MEDIUM (440 meters to 5 kilometers), HI (5 to 10 kilometers), and PA (10 to 40 kilometers). The latter setting (PA) is only used when the ASIP is vehicle-mounted. It sends data at the rates of 600, 1,200, 2,400, 4,800, or 16,000 bits per second.

## Coordination

6-61. The drop zone coordination checklist provides the DZST leader with a tool for coordinating before the mission without having to communicate with the aircraft (Figure 6-6).

## Support Requirements

6-62. The DZSTL ensure that support requirements for the drop zone control group are coordinated and in place no later than one hour before TOT. The two support groups are a complete support group and a partial support group. If the drop zone is 2,100 meters or longer or 20 seconds or more in exit time, or if more than one aircraft is executing the mission, then a complete control group must be used. If none of these situations exist, then a partial control group may be used.

## Control Groups

6-63. Control groups consists of--

-  An assistant DZSTL who is DZSTL qualified (complete control
group) or not (partial control group).
-  One (partial control group) or two (complete control group) frontline-ambulance (FLA) qualified medical personnel for personnel drops and heavy equipment. These personnel are not needed for
CDS drops, depending on local rules and regulations.
-  One (partial control group) or two (complete control group) windmeasuring devices. One is located at the control center with the DZSTL. In complete control groups, the second is located with the assistant DZSTL at the highest location on the drop zone.
-  Malfunction officer with camera,who must be a qualified and
current rigger IAW AR 59-4.
-  Parachute recovery detail with recovery kit. -  Vehicles with drivers. -  Road guards. -  Military Police, if required to control traffic or provide crowd
control.
-  Boat detail for PE drops only.

## Rescue Boat

6-64. A boat detail is required for personnel drops if a water obstacle is within 1,000 meters of any edge of the drop zone, at least 40 feet wide at the widest point, and at least 4 feet deep at its deepest point. If the water is at least 4 feet deep, but less than 40 feet wide, a boat detail is not required. However, jumpers must still use approved life preservers. The DZSTL may declare any body of water an obstacle based on jumper safety. 6-65. Units may supplement the requirements in this paragraph. When assessing DZ risk for a training parachute jump, the commander should consider the distance from the water obstacle to the DZ and the depth and width of the water obstacle.

6-66. The following factors may also enter into risk assessment of a water obstacle: the bottom, the current, the water temperature, the number of obstacles, the equipment available to reduce the risk, jumper experience, available or artificial light, and the importance of the DZ to mission success.

## Personnel

6-67. The OIC, NCOIC, and boat operators must all be qualified and licensed to operate the boats and the issued boat motors. Each boat needs one primary and one assistant operator and two recovery personnel, ideally one of whom is lifeguard qualified and combat lifesaver certified. Everybody in the boat should be a strong swimmer. 6-68. The DZSTL must--

-  Determine if a follow-on assessment of the DZ has been conducted
to confirm the current status.
-  Ensure the OIC or NCOIC is fully briefed on the plan. Ensure all
boat detail personnel have been trained and have all necessary equipment available to conduct the mission.
-  Read all applicable regulations, FMs, and SOPs. Ensure copies are
available throughout the mission.
6-69. The Jumpmaster must-

-  Ensure that, if approved life preservers are used, they have been
inspected within the last 180 days and are serviceable.
-  Ensure that all jumpers have received training on life preserver
wear, fit, and use (to include manual inflation).
-  Ensure all personnel have received prejump training within the 24
hours before drop time, with special emphasis on unintentional water landings.

## Time Requirements

6-70. The OIC or NCOIC ensures that at least two boats must be in place one hour before TOT. At least 10 minutes before TOT, both boats must be in the water with their engines running. Otherwise, a no-drop situation exists.

## Communications

6-71. Two-way communications with the DZSTL must be established at least an hour before TOT, and maintained throughout the jump operation.

## Coverage

6-72. To ensure that the entire obstacle is accessible to the boat detail, each water obstacle might require a different type of coverage.

## Equipment

6-73. Each recovery boat team needs the following equipment:

-  A rubber boat (RB-10) or solid-bodied boat of comparable size, with
operable outboard motor.
-  Enough fuel and oil to complete the mission. -  Life vest or other floatation device for each boat detail member,
and as many extras as they can carry for jumpers who might not already be wearing a B5 or B7 flotation device (water wings).
-  One life ring with attached rope.
-  One FM and one handheld radio, each with spare battery.
-  One each shepherd's crook and grappling hook. -  One long backboard for CPR. -  One aid bag with resuscitation equipment. -  One 120-foot long rope and four sling ropes with end-of-line
bowlines and snap links.
-  Four paddles.
6-74. For night operations, add the following:
-  Two operational night vision devices with two sets of batteries. -  One spot light.
Note: Jumpers wearing B5s or B7s need no life jackets.

## Basic Equipment List

6-75. The DZSTL should maintain an inventory of the following basic equipment to support the mission:

-  VS-17 panels. -  Smoke grenades or flares. -  White lights such as an M-2 light baton. -  Air traffic control light (B-2). -  Signal mirror. -  Strobe light. -  Binoculars. -  Anemometer required for personnel and heavy equipment drops,
recommended for measuring the wind before all types of drop.
-  Compass.
-  PIBAL kit with helium. -  Night vision goggles, for night drops. -  Other equipment as needed, based on premission coordination or
unit SOP.

## Duties Of The Leader

6-76. The DZST leader establishes and operates the DZ. He selects the locations of the control center, PI, and release point. He bears the ultimate responsibility for accomplishing the mission. Specifically, the leader

-  Makes sure the DZ reaches full operational status one hour before
drop time.
-  Conducts premission coordination.
-  Opens the DZ through range control. After the mission, accounts for
all personnel, air items, and equipment, then closes the DZ.
-  At least one hour before the drop, reconnoiters the DZ on the
ground or from the air for obstacles or safety hazards.
-  Establishes communication with departure airfield control officer
not later than (NLT) one hour before drop time.
-  Controls all ground and air MEDEVACs. -  Submits postmission reports to the appropriate agencies. -  Operates all visual acquisition aids. -  Ensures no-drop signals are relayed to the drop aircraft. -  Ensures all DZ markings display correctly. -  Establishes a ten-minute window. Ensures pathfinders continuously
monitor surface winds, starting NLT twelve minutes before time on target (TOT). This includes the ten-minute window plus two extra minutes to relay a no-drop signal, if needed. For example, if TOT is 0700 hours, then the ten-minute window (plus two minutes) begins at 0648 hours. If at any time during the ten-minute window the winds exceed allowable limits, the DZST leader relays a no-drop to the aircraft. Once he calls a no-drop, he establishes a new tenminute window (without an extra two minutes). For example, if the winds pick up at 0655 hours, the leader calls a no-drop. The new ten-minute window counts from the time of the no-drop and extends to the new TOT ten minutes after that, at 0705 hours.
-  Takes surface wind readings from the control center location and
from the highest point of elevation on the DZ when the DZ is 2,100 meters in length or longer, when exit time is 20 seconds or more, or for a multiple aircraft operation.
-  Calls a no-drop when surface winds exceed the limits shown in
Table 6-10.

| Type Of Load                                     | Surface Wind (In   |
|--------------------------------------------------|--------------------|
| Knots)                                           |                    |
|                                                  |                    |
| 13                                               |                    |
| 17                                               |                    |
| Personnel                                        |                    |
|                                                  |                    |
| Land                                             |                    |
|                                                  |                    |
| Water                                            |                    |
|                                                  |                    |
| 18                                               |                    |
| 20                                               |                    |
| HALO or HAHO                                     |                    |
|                                                  |                    |
| Land                                             |                    |
|                                                  |                    |
| Water                                            |                    |
| Equipment without ground disconnects             | 13                 |
| Equipment with ground disconnects                | 17                 |
| CDS using G-12 parachutes                        | 13                 |
| CDS or door bundles using G-13 or G-14           |                    |
| parachutes                                       |                    |
| 20                                               |                    |
| USAF tactical training bundles and simulated     |                    |
| airborne training bundles                        |                    |
| 25                                               |                    |
| High-velocity CDS at HAARS                       | No Restrictions    |
| Free drop                                        | No Restrictions    |
| For USAF personnel and additional equipment, see |                    |
| AFI 13-217                                       |                    |
| .                                                |                    |

## Control Center

6-77. The DZST leader controls and observes the airborne operation from the control center. Pathfinders also take wind readings here. The DZST leader should position all radios, signaling devices, and appropriate forms at the control center. The type of mission determines the location of the control center.

## Personnel Drops

6-78. Locate the control center at the PI.

## Cds Drops

6-79. Locate the control center 200 yards to the 6 o'clock of the PI.

## Other Drops

6-80. For free drops, heavy equipment, high velocity CDS, HAARS, and AWADS (ceiling less than 600 feet), locate the control center off the DZ where you can see both the approaching aircraft and the PI. For example, the wood line might obstruct the leading edge. If so, it would not make a good control center location for these types of drops.

## All Gmrs And Virs Dzs

6-81. Locate the control center at the RP.

## Signals

6-82. When voice control does not work, the ground support team uses visual signals to the aircraft. Two of the most important visual signals are no-drop and mission cancellation.

6-83. To communicate a no-drop situation to the aircraft, scramble the shape designator and remove the markings or any other previously coordinated DZ signal. 6-84. The drop aircraft pilot should continue to fly racetracks if coordinated until you give the signal indicating clear to drop. You can signal no-drop when

-  Winds exceed the maximum limitations for that type of drop. -  You see vehicles moving on the DZ. -  Rotary wing aircraft fly in close proximity to the DZ. -  You see anything else unsafe on the DZ.
6-85. Decide in mission coordination how many no-drop passes the pilot must fly before the mission is automatically cancelled and the pilot can begin his return to base. 6-86. Cover signals for clear-to-drop also. You may decide to indicate clearance to drop by emplacing DZ markings. You can also use this means if you have no smoke. If you plan to use smoke, decide what each color of smoke will mean, but avoid using red to mean clear-to-drop. 6-87. At night, your clear-to-drop signals could include any means coordinated in advance such as shade-designator illumination, a flashing white light, a green light, and so on. 6-88. Multiple signals are best. For example, FM and smoke for clear-todrop, or scrambled code letter and FM for no-drop (Figure 6-7).

## Determination Of Release Point Location

6-89. To determine a release point on a GMRS drop zone, Air Force fixed wing VIRS drop zone, or Army rotary wing VIRS drop zone, complete the following steps (Figure 6-8):

## Step 1--Determine Drop Heading

6-90. If the drop zone was surveyed and an AF IMT 3823, Drop Zone Survey, was published for the drop zone, then the DZSTL uses the magnetic course indicated. The drop zone might have been surveyed as a circular DZ, or a tactical assessment might have been done on it. It might be established as an ARMY VIRS. In the latter case, the DZSTL determines the drop heading based on the long axis, wind direction, and obstacles on the approach and departure ends of the DZ.

## Step 2--Determine Point Of Impact

6-91. The PI for personnel is the centerline of the drop zone 100 meters from the leading edge. The PI for bundles is the centerline of the DZ, but on the leading edge. These points may be adjusted forward, left or right.

For CDS and heavy equipment, the DZSTL uses the surveyed PI locations shown on the AF IMT 3823. If a tactical assessment was done in lieu of an AF IMT 3823, he uses the standard PI locations for CDS and heavy equipment from the CARP dummy tree.

## Step 3--Determine Wind Direction And Speed

6-92. The DZSTL uses the PIBAL to determine the MEW. If he has no PIBAL, then he must use the surface wind direction and speed. Once he determines the wind direction and speed, he calculates a D = K x A x V
formula for drift in meters.

## Step 4--Pace Off The Drift In Meters Into The Wind

6-93. This should be the reciprocal heading of the PIBAL direction. If a PIBAL was not used, then a field-expedient means of determining wind direction may be used. If the direction and distance of the drift are paced into the wood line, the PI is adjusted as necessary, but only forward, left, or right.

Example:  90 knots drop speed = 45 meters forward throw.

## Ground-Marked Release System

6-94. The GMRS offers the DZSTL a way to identify the release point to the drop aircraft without using a radio. The pilot uses the ground markings to adjust his flight path 100 meters to the right of the corner panel or light, and parallel to the approach-corner panel or light axis. (This discussion uses the words "panel" and "light" interchangeably.)

## Patterns

6-95. Use VS-17 panels to mark the DZ with an inverted "L," "H," or "T" pattern. The selected pattern must be coordinated far in advance.

## Inverted "L

6-96. The inverted "L" has four panels:

-  The approach panel. -  The corner panel. -  The alignment panel. -  The flanker panel.

## "H" And "T"

6-97. Align these other panels with and orient them on the corner panel. Due to side-angle-vision limitations in the C-5, use the seven-panel "H" and six-panel "T" patterns.

## Vs-17 Panels

6-98. Figure 6-9 shows panel emplacement for "H" and "T" patterns (add an inverted "L" figure). Distances and azimuths are measured from the upper right corner of each panel to the upper right corner of the next, and from center mass of the selected RP. During daylight airdrops, the marker panels should be raised at a 45-degree angle from the ground toward the aircraft approach path to increase the aircrew and jumpmaster's ability to see them.

## Corner Panel

6-99. Set up the corner panel 100 meters to the left of the RP (90 degrees from drop heading). Orient the long axis of the panel so it is parallel with drop heading.

## Alignment Panel

6-100. From the corner panel, move 50 meters in the same direction as above and emplace the alignment panel. Orient the long axis of the panel so it is perpendicular (90 degrees) from drop heading.

## Approach Panel

6-101. Place the approach panel 50 meters in front of the corner panel, on a back azimuth (opposite) from the drop heading. Orient the long axis of the panel so it is parallel with drop heading.

## Flanker Panel

6-102. Place the flanker panel 150 meters to the left of the alignment panel, as seen from the drop heading. Orient the long axis of the panel so it is perpendicular (90 degrees) from drop heading, and parallel to the alignment panel.

## Lights

6-103. At night, replace panels with lights (use one light for each panel). Do not use chem-lights for DZ markings. For operations requiring security, night DZ markings should be visible only from the direction of the aircraft's approach. If flashlights are used, they should be equipped with simple hoods or shields and aimed toward the approaching aircraft. Omnidirectional lights, fires, or improvised flares may be screened on three sides or placed in pits with the sides sloping toward the direction of approach. Use directional lights for the approach, corner, alignment, and flanker. If necessary, you can use the directional light holes for the far code letter and line up the base light with the corner light. Figure 6-10, page 6-36, provides construction requirements for Army code letters. Mark the release point with some type of identifiable light source to distinguish it from all other DZ markings.

## Marking Considerations

6-104. Place the markings where obstacles will not mask the pilot's line of sight. The DZ markings must be clearly visible to the aircrew on approach as early as possible. If conditions preclude placing the markings at the computed point, the DZSTL may have to adjust the location of the intended PI, ensuring the new PI location complies with the requirements for the type of airdrop. Advise both the aircrew and user of the change in PI location. As a guide, use a mask clearance ratio of 1 to 15 units of horizontal clearance. For example, suppose you must position a DZ marker near a terrain mask, such as the edge of a forest on the DZ approach. The trees measure 10 meters (33 feet) high. The markings would require 150 meters (492 feet) of horizontal clearance from the trees (Figure 6-11).

6-105. If any of the GMRS markings fall within a 15-to-1 mask clearance ratio on the approach end of the drop zone, and it is not feasible to adjust the selected PI, you can place an Army code letter (H, E, A, T) or a far (marker) panel on the trailing edge of the DZ. However, before doing so, you must coordinate this during either the DZST or aircrew mission briefing. Using a code letter will distinguish this DZ from other DZs in the area. The code letter is located at the end of the DZ or where the pilot can see it best, and aligned with the corner and approach panel, parallel to drop heading. 6-106. During daylight airdrops, the marker panels should be slanted at a 45-degree angle from the surface toward the aircraft approach path to increase the aircrew and jumpmaster's ability to see them. If security permits, smoke (other than red) may be displayed at the release point or corner marker to assist in DZ acquisition.

## Army Verbally Initiated Release System

6-107. The Army VIRS method establishes the release point on the DZ through radio communications. If tactically feasible, a code letter can mark the RP. However, the aircraft initiates the drop on verbal command from the ground. 6-108. Emplace a standard Army code letter with VS-17 panels (for daytime operations) at the release point. Position the base panel of this code letter exactly on the RP. Use code letter H, E, A, or T. Make the letter at least two panels high by one panel wide (Figure 6-12, page 6-38).

6-109. Emplace a flank panel to the left of a code letter at a distance of 200 meters or on the edge of the DZ, whichever is closer. Emplace a far panel 500 meters from the code letter along the drop heading or at the end of the DZ, whichever is closer. Position each panel with its long axis parallel to the drop heading and raised 45 degrees back toward the code letter. The DZSTL and radio operator position themselves at the release point.

6-110. At night, replace the panels with lights. Make the code letter at least four lights high by three lights wide, with 5 meters between each light. To limit ground observation, you may place the code letter, flank, and far light in holes as follows:

-  Place the code letter and far light in directional holes. -  Place the flank light in a bidirectional hole (toward RP and
direction of aircraft approach).
-  If the RP falls off the DZ, hide the markings, or if the DZSTL cannot
see the aircraft, he can change the parachute drop to a jumpmasterdirected release operation using the wind streamer vector count (Figure 6-13).
-  If the RP falls off the DZ and the DZSTL cannot, due to the tactical
situation, position himself at the RP, then he can conduct an offset
release (late, left, or right). To do this, he determines how many
seconds the aircraft must fly past him before initiating the release. He gives the aircraft steering corrections to fly over the RP, just as in a standard VIRS. However, when the aircraft has flown a set distance past the control center, the Pathfinder commands the pilot to "turn drop heading" or "execute." In Figure 6-14, the drop speed is 70 KIAS. The RP falls about 80 meters off the DZ, and the old and new control centers are 118 meters apart. Multiplying 70 KIAS by .51 equals 36 meters per second of flight. The 3 second offset places the RP about 118 meters from the control center or code letter. The DZSTL, code letter, and control center are positioned on the DZ at a distance from the RP that is rounded off to the nearest second.
Note: These same procedures may be used when the tactical situation prevents the pathfinder from positioning himself on the release point, but he must remain in a concealed location and call the VIRS drop offset from his position.

## Air Force Verbally Initiated Release System

6-111. When using USAF VIRS, the DZST leader verbally guides the pilot over the RP to align the aircraft for the drop. Figure 6-14 shows an example USAF VIRS transmission. 6-112. The leader uses this method when the tactical situation prevents use of regular markings or when aircraft pilots could not see regular markings from the air. 6-113. He establishes the VIRS DZ just as he would establish a GMRS or rotary-wing VIRS release point. (Figure 6-8, page 6-30, shows how to determine the location of the release point.) Unlike those release points, however, the USAF VIRS DZ RP requires no markings.

6-114. The leader sets up communications with the drop aircraft and at least two FM, VHF, and UHF radios on the DZ. 6-115. He transmits concise instructions to the aircraft. To align the aircraft on the desired inbound heading, he gives left and right turns. When the aircraft lines up on course, the pathfinder signals STOP TURN. About five seconds before the release, or at some other moment (as briefed), he signals STANDBY. 6-116. When the aircraft reaches the predetermined release point, the pathfinder leader gives an EXECUTE three times. 6-117. When transmitting the MEW to the aircraft, he makes sure to identify it as such. He states the altitude used to obtain it. He also provides pertinent details about any erratic winds or wind shears reported by other aircraft.

## Air Force Computed Air Release Point

6-118. The DZST leader and DZ party mark the point of impact on a surveyed DZ. The aircraft navigator computes the release point from the air.

## Coordination

6-119. Coordinate authentication markings with the aircrew.

## Code Letter Elevation

6-120. Never elevate the panels in the code letter.

## Personnel Buffer Zone

6-121. There is a minimum buffer of 300 yards on the lead, left, and right sides of the DZ, and minimum buffer of 200 yards on the trail edge of the DZ.

## Markers

6-122. Markers differ for day and night.

## Day Operations

6-123. For day operations (Figure 6-15), pathfinders mark the point of impact with a RAM (Figure 6-5, page 6-20) and an Air Force code letter (optional), which could be a "J," "C," "A," "R," or "S" (Figure 6-16). This applies to rectangular drop zones. They use "H" or "O" for circular drop zones. Each letter must measure at least 35-feet square, and requires at least nine panels flat on the ground.

## Night Operations

6-124. For night operations (Figure 6-17), mark the point of impact with

-  A code letter (made of at least nine lights) placed at the point of
impact.
-  One flanker light placed 250 meters to the left and right of the
point of impact. If terrain restricts the light placement to less than 250 meters, the aircrew will be briefed.
-  A trailing edge amber light placed 1,000 meters, centerline, from
the shape designator at the PI or at the trailing edge of the surveyed DZ, whichever is closer to the PI (optional). Usually, an amber
rotating beacon is used.

## Authentication

6-125. Authentication varies for day and night operations.

## Day Operations

6-126. During day operations, the DZSTL may authenticate or identify different sites by specifying drop times, drop headings, or alternating panel colors, or whatever he coordinates.

## Night Operations

6-127. During night operations, the DZSTL may authenticate or identify different sites by replacing one light in the code letter with any color light except white.

## Other Forms Of Carp Zones

6-128. Some other forms of CARP drop zones are random approach, area, and cicular drop zones. The GUC may also choose to place the point of impact randomly to better serve the mission.

## Random Approach Drop Zone

6-129. A random approach DZ is a variation of a previously surveyed DZ. It must be big enough for multiple run-in headings. Any axis of approach may be used as long as the resulting DZ meets the minimum criteria for the load or personnel being airdropped, and as long as it is within the boundaries of the original, surveyed DZ. In all cases, the DZSTL performs a safety-of-flight review before using a random approach DZ.

## Area Drop Zone

6-130. An area DZ (Figure 6-18) has a start point (A), an endpoint (B), and a prearranged flight path (line-of-flight) over a series of acceptable drop sites between A and B. The distance between A and B is no more than 15 nautical miles. Changes in ground elevation within one-half NM of centerline should be no more than 300 feet. The reception committee can receive the drop anywhere between A and B within one-half NM of centerline. Once the pilot identifies and locates the prebriefed signal or electronic NAVAID, he can make the drop.

Note: Area DZs only apply to C-17 operations when crews are SOLL II qualified.

## Circular Drop Zone

6-131. The size of the DZ is governed by mission requirements and usable terrain. The PI of a circular DZ is normally at the DZ center to allow for multiple run-in headings. For specific missions, the PI location may be adjusted to allow for dropping loads such as sequential heavy equipment (HE) loads or mass container delivery system (CDS) loads on circular DZs. However, this limits the run-in heading to only one direction. In all cases, the minimum DZ dimensions for the type and number of loads being dropped must fit within the surveyed circular DZ. The DSZTL computes the circular drop zone as shown in Figure 6-19 to determine whether the minimum DZ fits into the surveyed circular DZ. When the PI has been relocated, he should use Option 2. The DZSTL calculates and records the size of the circular DZ using Option 1 on the DZ survey form. This prevents confusion and reduces the risk of off-DZ drops if the circle center point is used as the PI.

## Random Points Of Impact

6-132. When mission requirements dictate, the DZSTL may use the RPI placement option. He has two options:

## Option 1

6-133. The mission commander notifies the DZSTL at least 24 hours in advance that RPI placement will be used. When the DZ is established, the DZSTL randomly selects a point on the DZ and establishes that point as the PI for the airdrop. The DZSTL ensures that the DZ meets the minimum size requirements for the type of load and that the entire DZ falls within the surveyed boundaries.

## Option 2

6-134. The mission commander or supported force commander may request the DZ established with the PI at a specific point on the DZ. Requests should be made at least 24 hours in advance. The requestor ensures that the DZ meets minimum size criteria for the type of load, and that the entire DZ falls within the surveyed boundaries.

## Multiple Points Of Impact

6-135. An MPI airdrop is authorized if everyone involved has been properly briefed. An MPI airdrop is the calculated dispersal, both laterally and longitudinally, of airdropped loads to predetermined locations on a DZ. The DZ must meet the minimum size requirements for each PI, and the DZSTL must provide the precise location of each PI
to the aircrews. Offset PIs are surveyed PIs 250 yards left and right of the surveyed PI. The DZ width must be increased to meet the distance criteria from the DZ edge to the PI. This manner of placement reduces the effects of wake turbulence across the DZ.

Note: Personnel airdrops from C-17s in formation may require offset (laterally displaced) points of impact.

## Assault Zone Availability Report

6-136. The Zone Availability Report (ZAR) is a consolidated list of DZs and LZs maintained by HQ AMC for use by DoD aircraft. The direction and guidance for DZ and LZ operations is AFI 13-217. The ZAR currently contains both CONUS and OCONUS surveys forwarded by the owning command. Overseas zones are not controlled by AMC, but will be included, as they are also forwarded by the owning commands.

6-137. To request survey of a new or existing zone, the commander contacts 720th STG/DOO, Hurlburt Field FL (DSN 579-6055). He should send new or updated DZ surveys to his nearest wing/group tactics office for a safety of flight review. He forwards completed DZ, LZ, and HLZ surveys to HQ AMC/DOKT for inclusion in the ZAR. 6-138. To obtain a completed survey, he can use the fax-on demand system at Scott AFB, IL (DSN 576-2899), (Com (618) 256-2899). The Internet site available for military (.mil) users is located at https://
amc.scott.af.mil/do/dok/zar.htm.

| Purpose              | Address      |
|----------------------|--------------|
| 720th STG/DOO,       |              |
| Hurlburt Field FL    |              |
| DSN                  |              |
| 579-6055             |              |
| NA                   | To request a |
| survey of a new      |              |
| or existing zone     |              |
| To submit or         |              |
| obtain a             |              |
| completed            |              |
| survey               |              |
| HQ AMC/DOKT, 402     |              |
| Scott Drive, Unit    |              |
| 3A1, Scott AFB, IL   |              |
| 62225-5302           |              |
| DSN                  |              |
| 576-2899             |              |
| COM 618              |              |
| 256-2899             |              |
| https://             |              |
| amc.scott.af.mil/do/ |              |
| dok/zar.htm          | (.mil        |
| users only)          |              |

## Af Imt 3823, Drop Zone Survey

6-139. A drop zone survey is required for airborne operations. The two types of surveys are tactical and existing surveyed drop zones. Completing a DZ survey requires a physical inspection of the DZ and documentation of findings on AF IMT 3823. The using unit may complete the survey. The using unit is the one whose equipment or personnel is being airdropped. For exercises and joint training operations, users complete the survey and ensure the DZ meets the criteria for operational and safety standards. The user physically inspects the DZ before use to identify and evaluate potential hazards to the airdropped personnel or equipment, to man-made or natural structures, and to ground personnel. The DZST is qualified to survey the DZ and complete the AF IMT 3823. After completing all blocks that apply, the DZST sends the survey to the nearest active duty tactics office for review by the appropriate radio operator. The radio operator then forwards the survey to HQ, AMC TACC/DOOXY, who determines the proper approval authority and obtains the approval. After approval, the TACC/DOOXY enters the survey into the BBS, where it is then available for use. These procedures are used to approve surveys for all AMC, ACC, and AMC/ACC gained aircraft.

## Safety-Of-Flight Review

6-140. The nearest group tactics office completes a safety-of-flight review on all DZ surveys. This review ensures that an aircraft can safely enter and leave the DZ. The review includes an in-depth chart study of the terrain features along the route of flight from the IP to about 4 nautical miles past the DZ trailing edge. For a complete list of regional group/wing tactics offices see https://amc.scott.af.mil/do/dok/zar.htm.

## Tactical Assessment

6-141. During exercises and contingencies, when time or situation prevent the completion of a full DZ survey, such as to support highly mobile ground forces, the using unit must at least complete a tactical DZ survey. 6-142. Though using the AF IMT 3823 (discussed later in this chapter) is preferred, it is not required for a tactical survey. Requests and surveys may be sent electronically. As much information as practical should be obtained and forwarded for review. The unit sends requests for a final review of the tactical survey to the designated exercise or contingency airlift, or to the senior representative of the special operations airlift component. 6-143. When using a tactical DZ (Table 6-11), the airlift unit assumes responsibility for aircraft safety of flight; the receiving unit assumes responsibility for injury to personnel or damage to equipment or air items. The DZ size is determined by the mode of delivery, load dispersal, and discussion with the receiving unit about air item recoverability and load survivability.

| Type Drop       | Aircraft     | Day or Night Point of   |
|-----------------|--------------|-------------------------|
| Impact *        |              |                         |
| CDS             | C-130        | Day                     |
| yards/183       |              |                         |
| meters          |              |                         |
| Night           | At least 250 |                         |
| yards/229       |              |                         |
| meters          |              |                         |
| C-17            | Day          | At least 225            |
| yards/206       |              |                         |
| meters          |              |                         |
| Night           | At least 275 |                         |
| yards/251       |              |                         |
| meters          |              |                         |
| Personnel       | All USAF     |                         |
| fixed-wing      |              |                         |
| aircraft        |              |                         |
| Day             | At least 300 |                         |
| yards/274       |              |                         |
| meters          |              |                         |
| Night           | At least 350 |                         |
| yards/320       |              |                         |
| meters          |              |                         |
| Heavy Equipment | Day          | At least 500            |
| yards/457       |              |                         |
| meters          |              |                         |
| Night           | At least 550 |                         |
| yards/503       |              |                         |
| meters          |              |                         |

* Point of impact shown in distance from the leading edge of the drop zone and centerline.

## Instructions For Completion

6-144. This paragraph explains how to complete AF IMT 3823, Drop Zone Survey, shown completed in Figures 6-20A and 6-20B (pages 6-51
and 6-52). All blocks must be completed. The completer should write
"NA" in blocks that do not apply. When performing a safety-of-flight review on a foreign DZ, the completer should enter as much information as possible on AF IMT 3823. At a minimum, he must provide information for blocks 4D, 6A, 6B, 7, 9A-F, and 9H. He should attach a copy of the foreign DZ to the safety-of-flight review.

## Block 1A

6-145. Enter DZ name.

## Block 1B

6-146. If the survey will be sent to HQ AMC/DOTK for inclusion in the ZAR database, then enter only "NA." If the survey is for local use, then the group tactics office should complete this block.

## Block 2A

6-147. Enter the country where the DZ is located.

## Block 2B

6-148. Enter the state, province, or territory.

## Block 3

6-149. Enter map series, sheet number, edition, and date of map used.

## Blocks 4A1 Through 4A4

6-150. Enter the date of the original survey and the surveyor's name, grade, telephone number, and unit of assignment. The surveyor signs above his typed name.

## Block 4B

6-151. The surveyor enters an "A" (if approving) or "D" (if disapproving) for each drop category. He must complete all of the printed categories. He uses the blank column for special, additional approvals.

## Block 4C

6-152. The ground operations approval authority verifies the survey by signing in this block.

## Block 4D

6-153. The chief of group tactics or whoever the OG/CC or equivalent assigns to do so completes a safety-of-flight review.

## Block 4E

6-154. The reviewer's (OG/CC's or ACC's) signature in this block authorizes the aircraft to operate over the DZ. If operational requirements dictate, he then sends the survey to HQ AMC/DOKT, 402 Scott Drive, Unit 3A1, Scott AFB, IL 62225-5302, so they can add that DZ to their ZAR database. The group tactics offices keep DZ surveys.

## Blocks 5A Through 5E

6-155. Enter the controlling agency responsible for scheduling the DZ. If the DZ is within a controlled or monitored area, enter the range control data for that location. If the DZ is not located on government owned property. If applicable, the requesting unit must obtain a land use agreement (LUA) or memorandum of understanding (MOU), checks the block (5A through 5E) that applies, and attaches a copy of the memorandum. If the DZ falls within a controlled area, enter the range control data for that location.

## Block 6A Through 6C

6-156. Enter the DZ dimensions using either meters or yards. For a circular DZ, enter the radius.

## Blocks 6D Through 6F

6-157. Enter the distance from the leading edge of the DZ to each PI in either meters or yards.

## Blocks 7A Through 7D

6-158. Enter the primary DZ axis in magnetic, grid, and true North, and include the source and date of the variation data. Use the current year when obtaining the information from a GPS. If DZ is circular, enter "NA."
Note: List any applicable DZ axis restrictions in the remarks block.

## Block 8A Through 8D

6-159. Enter the elevation in mean sea level (MSL) for each PI and for the highest point on the DZ.

## Block 9A

6-160. Enter the spheroid used to compute coordinates for the DZ. You can find this information on the map legend. If the GPS is set to operate in WGS-84 mode, then enter "WGS-84" in this block.

## Block 9B

6-161. Enter the MGRS datum used to compute the coordinates. You can also find this information in the map legend. Again, if you are using a GPS, enter "WGS-84."

## Blocks 9C Through 9E

6-162. Enter the grid zone, Easting, and Northing obtained from the map.

## Block 9F

6-163. Place an "X" in the appropriate block.

## Block 9G

6-164. Enter the grid zone designator, grid square identifier, and the ten-digit MGRS coordinates. Briefly describe an easily recognized point on or near the DZ, such as a road intersection, benchmark, or pond, that can be used by the DZ party to find the PIs. Include a distance and azimuth from this point to the nearest PI. If needed, continue the point of origin remarks in Remarks.

## Block 9H

6-165. Enter the ten-digit MGRS coordinates in local datum and spheroid and the WGS 84 latitude/longitude coordinates to the nearest one-hundredth minute for each indicated point.

## Block 9I

6-166. For each corner of the DZ, enter the ten-digit MGRS coordinates in local datum and spheroid and the WGS-84 latitudinal and longitudinal coordinates to the nearest one-hundredth minute.

## Block 10

6-167. Enter the name of the DZ and clearly sketch it manually or using a computer program. Include all obstacles or prominent features within the DZ boundaries. Add an arrow for magnetic north to orient the user. Enter the name of the DZ.

## Block 11

6-168. Comment on pertinent operations here. Describe safety hazards such as towers. Describe all charted or observed bodies of water and power lines within 1,000 meters of the DZ boundaries.

## Block 12

6-169. State whether photographs of the DZ and approaches to it are available, and whether a low-level route is associated with the DZ.

Whoever completes the safety-of-flight review should know this information and mark this block accordingly.

## Af Imt 4304, Drop Zone/Landing Zone Control Log

6-170. The AF IMT 4304, *Drop Zone/Landing Zone Control Log*, Figure
6-21, page 6-57, is a scorecard for the Air Force. Since the aircrew computes the air release point on the DZ, the Air Force needs documentation of the crew's performance. The DZSTL ensures this form is complete and accurate based on the instructions that follow:

## Date

6-171. Enter either calendar or Julian date and year. When time is required, use local or GMT consistent with the date.

## Location

6-172. Enter DZ name.

## Cct And Unit

6-173. Enter your (the DZSTL's) name and unit.

## Dz/Lz Control Officer And Unit

6-174. Enter the name of the person controlling the DZ.

## Drop Zone Safety Officer And Unit

6-175. Enter the names of the people (you or someone else) who is acting as the DZ safety officer and the unit safety officer. If you are doing both, then write in your name for both.

## Line No

6-176. Enter the mission sequence number of each aircraft. Each line number on any given drop zone mission represents an individual pass over the DZ. If you have a multiple aircraft DZ, you should still use a separate line number for each aircraft. For example, use three line numbers for a three-ship operation. Assign a line number to no-drop passes also. Write the reason for each no-drop in remarks.

## Type Acft

6-177. Enter the mission design series.

## Unit

6-178. Enter the aircraft's (using) unit.

## Call Sign

6-179. Enter the call sign of the lead aircraft and, if applicable, formation position numbers.

## Type Msn

6-180. See the legend for abbreviations of the types of missions.

## Eta

6-181. Enter the estimated time of arrival, estimated TOT, or S3 air brief. Use the same unit of time throughout the form.

## Ata/Atd

6-182. Enter the actual time of each pass or the actual time of departure.

## Strike Report

6-183. The strike report yards or clock is the actual purpose of this form. Observe the first parachute-suspended item from the control center, and then determine the distance in yards and the clock direction relative to the PI. Use 12 o'clock as the magnetic drop heading. If the first parachute lands within 25 yards of the PI, then write "PI" here to indicate a PI strike. If you were unable to maintain visual contact with the first parachute, especially during a multiple aircraft operation, then score the drop "S" (satisfactory) or "U" (unsatisfactory). If 90 percent of the parachutes land on the DZ, score the drop as satisfactory. If less than 90 percent hit the DZ, score it unsatisfactory. If you maintain radio communications with the drop aircraft, then relay strike reports to them so they can adjust their subsequent passes accordingly.

## Yds

6-184. If the first jumper, container, or pallet lands within 25 yards of the PI, write "PI." If it lands farther from the PI, enter the distance from the PI in yards.

## Clock

6-185. Use the direction of flight as 12 o'clock and its back azimuth as 6 o'clock. Estimate the direction from the PI to the first jumper, container, or pallet. If you can, enter the actual measurement.

## Lz

6-186. Mark the "S" (satisfactory) box if a landing occurred in the first 500 feet of the LZ. If the aircraft had to go around again, if the drop fell short of the touchdown zone, or was more than 500 feet from the beginning of the touchdown zone, mark the "U" (unsatisfactory), and comment in Remarks.

## Surf Wind

6-187. Enter the surface wind direction in degrees. Enter the highest wind velocity measured during the 10 minute window for that pass.

## Score Method

6-188. Select from the Legend the abbreviation for the method you use to determine the distance between the PI and the first parachute.

-  E = Estimated (You made a calculated guess). -  P = Paced (You paced off the distance). -  M = Measured (You used a calibrated measuring device to
determine the distance).

## Mean Effective Wind

6-189. Enter the time you measured the wind and the altitude where you measured it.

## Time

6-190. This is self-explanatory.

## Alt

6-191. Enter the drop altitude.

## Dir & Lvl

6-192. Enter the wind direction in degrees and the velocity in knots.

## Remarks

6-193. Enter anything about the DZ operation that could help the Air Force during pilot debriefing. The DZSTL forwards AF IMT 4304 (Figure
6-21) to the air operations officer, who submits it through the chain of command to the USAF representative. If the DZSTL has radio communication with the aircraft, he transmits the strike report directly to the aircraft, for example--
"Lifter one-six, strike report, three o'clock two-hundred yards."
or
"Lifter one-six, strike report, PI."

## Appendix A Close Air Support And Close Combat Attack

This appendix does not change existing doctrine, tactics, techniques, or procedures for employing pathfinder teams and elements. It just introduces a vision of how CAS affects pathfinder teams.

## Definitions

A-1. Close air support (CAS) is an air action by fixed and rotary wing aircraft against hostile targets that are in close proximity to friendly forces and require detailed integration of each air mission with the fire and movement of those forces.

A-2. Close combat attack (CCA) is a technique to control attack helicopters (AH-64 or OH-58D) in a close air support role, usually very near friendly troops in contact. It helps the pilot see the same target you see.

## Purpose

A-3. The main purpose of CAS/CCA is to provide support to ground unit commanders. Other purposes of CAS include the following:

## Air Interdiction

A-4. Air interdiction (AI) is very useful to the ground unit commander planning an assault. Air superiority is essential in accomplishing the mission. AI assets will own the air in the area of operation, eliminating the possibility of the friendly forces being hit by enemy CAS.

## Security And Reconnaissance

A-5. Close air support aircraft can pull security during airmobile operations, as well as reconnoiter the air before any mission to remove any air threats.

## Attack

A-6. CAS/CCA aircraft can attack targets without actually being on a support mission. CAS/CCA can commence bombing runs or strafing runs on one of many different target types.

## Theater Missile Defense

A-7. CAS/CCA aircraft can provide missile defense.

## Special Operations

A-8. Certain CAS/CCA aircraft are set aside strictly for special operations units and missions.

## Support By Fire

A-9. Though not the main purpose of CAS/CCA, support by fire is the most common.

## Suppression Of Enemy Air Defenses

A-10. Most CAS/CCA aircraft have SEAD capability, and usually conduct SEAD missions before any air mission.

## Types Of Aircraft

A-11. The following aircraft are the ones that will be most commonly seen by the pathfinder team during a deployment. Table A-1 shows the mission, armaments, capabilities, and limitations of each aircraft in the CAS theater.

## Target Types

A-12. Target types include
-  Point (tank, radar antenna). -  Soft (vehicle, personnel). -  Hard (armor, bunker). -  Area (column of armor, troops in the open).

## Weapons Effects

A-13. The method by which a particular weapon alters a target is called a damage mechanism. The five most commonly encountered damage mechanisms for conventional weapons are as follows:

## Blast

A-14. This effect is caused by tremendous overpressure (up to 700 tons per square inch). The bomb expands to one and a half times its normal size. This effect is maximized with a surface burst. Targets include buildings, machinery, and structures.

## Fragmentation

A-15. This effect extends over a greater area than that of a blast (up to 3,000 feet). The fragment size depends on the thickness of case, the case material, and the explosive material. Targets include troops, aircraft, and vehicles.

## Armor Penetrating

A-16. Amount of penetration and thickness is determined by the type of round used. Targets include tanks and cement buildings.

## Cratering

A-17. General purpose bombs can make unpassible craters in the ground. Targets include airfields and highways.

## Incendiary

A-18. Dedicated incendiaries produce an intense, relatively small fireball that is more spectacular than effective. Combined effects weapons include an incendiary element that burns intensely for a longer time period. Maximize by hitting something that burns. Targets include uncovered supplies and combustibles.

## Aircraft Weapons Types

A-19. Aircraft weapons have evolved into complex systems capable of accurately targeting and destroying even the most heavily-armored vehicles on the modern battlefield. Below are some of the most common types of aircraft weapons.

## Guns

A-20. Guns include the 20 mm, 25 mm, 30 mm, 40 mm, and the 105- mm howitzer. They penetrate armor and are highly explosive against soft targets. Guns are simple and cannot be jammed and spoofed.

## General Purpose Bombs

A-21. General purpose bombs include the MK-80 series and penetration bombs. Explosive weight is 10 percent to 30 percent of bomb weight. Heavy, forged-steel case to prevent breakup. Blunt-nosed and flat-sided to prevent ricochet. Best penetration capability. Good fragmentation with fair blast.

## Agm

A-22. The AGM-65 Maverick has easy mission planning. Launch and leave, as well as very accurate missile. It has low collateral damage and must have fair weather to engage.

## Risk Estimated Distances

A-23. The casualty criterion is a prone soldier in winter clothing who is unable to function within five minutes after an assault. Troops in contact are friendlies within 1 kilometer of targets. Ordnance delivered inside the 0.1% PI is considered danger close (Table A-2). The forward air controller (FAC) must advise the ground commander by passing the ground commander's initials. This indicates the acceptance of the risk for ordnance. Peacetime numbers are found in ACCR 55-26.

| Item              | Description                    |   REDs |
|-------------------|--------------------------------|--------|
| (m)               |                                |        |
| 10.0% PI          | 0.1% PI                        |        |
| 2.75" rocket      | Rocket with various            |        |
| warheads          |                                |        |
| 145               | 240                            |        |
| 5" rockets        | Zuni with various warheads 220 |    340 |
| Hellfire          | AGM-114                        |     40 |
| GAU-8             |                                |        |
| (A-10)            |                                |        |
| 30-mm gatling gun | 40                             |     65 |
| AGM-65            | Maverick                       |     25 |
| AC-130            | 25mm, 40mm                     |        |
| 105mm             |                                |        |
| 50/45             |                                |        |
| 95                |                                |        |
| 70/85             |                                |        |
| 230               |                                |        |
| MK-82 LGB         | GBU-12                         |     95 |
| MK-84 LGB         | GBU-10/24                      |     90 |
| CBU-87            | CEM or Gator                   |    165 |

## Target To Weapons

A-24. Table A-3, page A-6, shows what weapons are used to destroy what targets.

| Target               | Weapon         | Target          |
|----------------------|----------------|-----------------|
| Soft                 | GP bomb        | Area denial and |
| channelization       |                |                 |
| CBU-89/              |                |                 |
| CBU-104              |                |                 |
| Gator                |                |                 |
| CBU-52/58/71         | AGM-154        |                 |
| JSOW                 |                |                 |
| CBU-87/CBU-103       |                |                 |
| CEM                  |                |                 |
| Armor                | CBU-87/CBU-103 |                 |
| CEM                  |                |                 |
| 20-/25-/30-/40-/105- |                |                 |
| mm guns              |                |                 |
| AGM-65               |                |                 |
| Maverick             |                |                 |
| 30-mm (API)          | Hard           | GP bomb with    |
| steel nose           |                |                 |
| plug                 |                |                 |
| BLU-109/113          | CBU-97/        |                 |
| CBU-105              |                |                 |
| SFW                  |                |                 |
| AGM-65 Maverick      | CBU-89/        |                 |
| CBU-104              |                |                 |
| Gator                |                |                 |
| LGB                  | LGB            |                 |
| GBU-15               | MK-20          |                 |
| Rockeye              |                |                 |
| Point                | LGB            | SAM and AAA     |
| site                 |                |                 |
| Antiradiation        |                |                 |
| missiles             |                |                 |
| AGM-65 Maverick      | PGM            |                 |
| GBU-15               | CBU            |                 |
| 20-/25-/30-/40-/105- |                |                 |
| mm guns              |                |                 |
| GP bomb              |                |                 |

## Appendix B Operational Formats

Pathfinder leaders can use the operational formats described in this appendix to plan and carry out pathfinder operations. These formats are intended as guides and should be modified as required.

## Planning Format

B-1. The pathfinder leader uses the operation planning format shown in Figure B-1, page B-3, to organize an operation. This format consolidates information about each person or element. The leader can refer to this information during his planning and briefing. This format provides columns for writing in

## Acft No

B-2. Write in either the chalk number or the last three digits of the number painted on the tail of the aircraft that will transport the pathfinder.

## Name

B-3. Write in the name of each pathfinder.

## Load Time

B-4. Write in what time the pathfinder must be on the aircraft with all of his equipment.

## To Time

B-5. Write in what time the aircraft will depart the staging area (the takeoff time).

## Duty And Location

B-6. Write in each pathfinder's mission assignment and location within the operational area.

## Call Sign And Frequency

B-7. Write in the radio call sign and frequency for each person operating a radio.

## Equipment

B-8. List all equipment, other than individual equipment, that each pathfinder element will carry.

## Remarks

B-9. Write in any other pertinent information.

## Landing Zone And Drop Zone Control Records

B-10. The leader can make up an LZ/DZ control record based on the example formats shown in Figure B-2, page B-4. He uses this to record aircraft arrivals, departures, and load types. This record provides information for both ground and aviation commanders. It helps account for personnel and equipment. It can also help leaders initiate or conduct search-and-rescue operations for overdue or downed aircraft. The pathfinder internal radio net(work) operator, located at the control center, normally maintains this record.

## Format Headings

B-11. Format headings include the following:

## Pathfinder Unit

B-12. Enter the pathfinder unit's code or number designation.

## Supported Unit

B-13. Enter the name of the main ground or aviation unit.

## Period

B-14. Enter the date and time the operation will start and finish. Enter 0001 for the start time of a succeeding day. Enter 2400 for the end time if the operation will continue the next day.

## Operation (Afld Lz, Dz)

B-15. Enter the name or number of the operation. Cross out items that do not apply. Add any special designation used.

## Recorder

B-16. Enter the name of the person who records data on this form.

## Column Headings

B-17. Column headings include the following:

## Flt Or Acft No

B-18. This means "flight or aircraft number," so enter the flight or aircraft's radio call sign.

## Type Acft

B-19. This means "type aircraft," so enter the Army or Air Force aircraft model designation.

## Time Comm Estab

B-20. This means "time communication established," so enter what time the aircraft acknowledges contact (radio, visual, or both, as applicable).

## Time (Arr, Dprt)

B-21. Enter the time the aircraft arrives or when the first of the flight lands. Enter the aircraft's departure time, or the time the last of the flight clears the ground.

## Type Load (Delivered, Evac)

B-22. Enter what type of load the aircraft delivered or evacuated (supplies, equipment, or personnel).

## Remarks

B-23. Write in any other pertinent information.

## Troop-Leading Procedures

B-24. From the moment he receives an order to conduct a pathfinder operation, the pathfinder leader does his best to use the following troopleading procedures (TLPs):

## Section Warning Order

B-25. Issue a section warning order, including
-  Roll call. -  A brief statement of the enemy and friendly situations. -  The mission. -  Chain of command and section structure. -  Individual uniform and equipment (if not in SOP). -  Equipment required. -  Time schedule to complete work priorities (state who must show
up, and where and when they must show up).
-  Specific instructions and attached personnel. -  Time hack.

## Tentative Plan

B-26. Make a tentative plan of the operation.
-  Study the map. -  Check the weather. -  Study the unit SOP. -  Make a quick estimate of the situation. Will you need extra
personnel from the supported unit, other equipment or materiel, or additional communications resources?

-  Begin planning.

## Movement And Coordination

B-27. Arrange for movement and coordination.
-  Arrange to move unit and inform second in command. -  Coordinate with ground and aviation units. Cover the ground
tactical plan, the landing and unloading plan, the air movement plan, and the loading plan. Arrange for any extra people or equipment needed from the supported unit.

## Tentative Operation Plan B-28. Prepare A Tentative Operation Plan.

-  Reconnoiter when time permits (map, ground, air).
-  Continue the estimate and receive recommendations.
-  Complete the plan (work out details, formulate orders). Present the
tentative plan to the supported unit commander or his staff. Prepare the final plan based on the desires of supported unit commander and on his final order.
-  Issue section order (normally an oral order). -  Join supported unit. -  Rehearse and inspect (if time and terrain permit).

## Appendix C Army Helicopter Specifications

For pathfinders to help select landing sites they must know the dimensions of Army aircraft that US Army active and reserve units could employ. The art in this appendix shows helicopters currently in use as of this manual's publication date.

## Observation Helicopters

C-1. This category currently includes only the OH-58D Kiowa. Table C-1 shows specifications for the Kiowa; Figure C-1 shows the aircraft from three angles.

| Rotor Diameter                     | 35'                |
|------------------------------------|--------------------|
| Length:                            |                    |
| Rotor Operating                    | 42' 2"             |
| Blades Removed                     | 33' 10"            |
| Height to Top of Turret            | 12' 9 12"           |
| Tread of Skids                     | 6' 2"              |
| Main Rotor:                        |                    |
| Disk Area                          | 0.962 sq ft        |
| Blade Area                         | 38.26 sq ft        |
| Clear Area Needed for Rotor 12.5 m |                    |
| TDP #1                             | 25 meters diameter |

## Attack Helicopters

C-2. This category of helicopters includes the AH 64A Apache and the AH 64D Longbow Apache.

## Ah 64A Apache

C-3. Table C-2 shows specifications for the AH 64A Apache; Figure C-2 shows the aircraft from three angles.

| Rotors Operating                | 58' 3 18"   |
|---------------------------------|------------|
| Rotors Static                   | 57' 4"     |
| Fuselage                        | 48'        |
| Height                          | 15' 3 12"   |
| Clear Area Needed for Rotors    | 17.9 m     |
| Minimum TDP without commander's |            |
| approval is #3                  |            |
| 50 meters                       |            |
| diameter                        |            |

## Ah 64D Longbow Apache

C-4. Table C-3 shows specifications for the AH 64D Apache; Figure C-3
shows the aircraft from three angles.

| Rotor Diameter                  | 48'         |
|---------------------------------|-------------|
| Length:                         |             |
| Rotors Operating                | 58' 3 18"    |
| Rotors Static                   | 57' 4"      |
| Fuselage                        | 48'         |
| Height                          | 15' 3 12"    |
| Clear Area Needed for Rotors    | 17.9 meters |
| Minimum TDP without commander's |             |
| approval is #3                  |             |
| 50 meters                       |             |
| diameter                        |             |

## Utility Helicopters

C-5. This category of helicopters includes the UH-1H Iroquois and the UH-60A/L Blackhawk.

## Uh-1H Iroquois

C-6. Table C-4 shows specifications for the Iroquois; Figure C-4 shows the aircraft from three angles.

| Rotor Diameter                      | 48'         |
|-------------------------------------|-------------|
| Length:                             |             |
| Rotors Operating                    | 57' 1"      |
| Rotors Static                       | 57' 1"      |
| Fuselage                            | 41' 10 34"   |
| Span, Maximum Lateral               | 9' 4"       |
| Height                              | 14' 6"      |
| Tread                               | 8' 6 12"     |
| Main Rotor Ground Clearance, Static |             |
| Against Stops                       |             |
| 6' 6"                               |             |
| Clear Area Needed for Rotors        | 17.4 meters |
| TDP #2                              | 35 meters   |
| diameter                            |             |
| Cargo Hook Capacity                 | 4,000 lb    |

## Uh-60A/L Blackhawk

C-7. Table C-5 shows specifications for the UH-60A & L Blackhawk; Figure C-5 shows the aircraft from above and from the left side.

| Rotor Diameter   | 53' 8"   |
|------------------|----------|
| Length:          |          |
| Rotor Operating  | 64' 10"  |
| Rotor Folded                        | 64' 10"     |
|-------------------------------------|-------------|
| Fuselage                            | 50' 7 12"    |
| Span, Maximum Lateral               | 9' 8 12"     |
| Height                              | 16' 5"      |
| Tread                               | 8' 10 12"    |
| Main Rotor Ground Clearance, Static |             |
| Against Stops                       |             |
| 8' 9"                               |             |
| Clear Area Needed for Rotors        | 19.5 meters |
| TDP #3                              | 50 meters   |
| diameter                            |             |
| Cargo Hook Capacity                 |             |
| A Model                             | 8,000 lbs   |
| L Model                             | 9,000 lbs   |

## Cargo Helicopters

C-8. This category of helicopters includes only the CH-47 D Chinook. With slingload, cargo helicopter TDP is #5 (100-meter diameter); without slingload, it is #4 (80-meter diameter). Table C-6 shows specifications for the CH-47 D Chinook; Figure C-6 shows it from three angles.

| Rotors Operating                    | 98' 10 34"          |
|-------------------------------------|--------------------|
| Rotors Folded                       | 51'                |
| Fuselage                            | 51'                |
| Height (Overall)                    | 18' 7              |
| 13/16                               |                    |
| "                                   |                    |
| Tread                               | 11' 11"            |
| Rotor Ground Clearance:             |                    |
| Static Forward                      | 7' 10              |
| 5/8                                 |                    |
| "                                   |                    |
| Idling Forward                      | 11'                |
| 7/8                                 |                    |
| "                                   |                    |
| Clear Area Needed for Rotors        | 30.4 meters        |
| TDP #4                              | 80 meters diameter |
| Allowable Cargo Load:               |                    |
| Forward Hook                        | 17,000 lb          |
| Center Hook                         | 26,000 lb          |
| Aft Hook                            | 17,000 lb          |
| Fore & Aft Hooks combined 25,000 lb |                    |

## Appendix D Digitization Supplement

This appendix does not change existing doctrine, tactics, techniques, or procedures for employing pathfinder teams and elements. It just introduces a vision of how digitization will affect pathfinder teams.

## Definition

D-1. "Digitization" refers to the ongoing effort to integrate the Army's diversified battlefield operating systems into a network in which leaders and Soldiers can share and interchange current information about the battlefield environment for immediate or later use. Digitization is the near real-time transfer of battlefield information between diverse fighting elements to permit a shared awareness of the tactical situation.

Accelerated operational tempo, instant communications, and immediate response times will characterize the digital environment. D-2.

Digitization is based on advancements in computers, communications, satellite navigation, and own-the-night (OTN) vision and sighting capabilities. Satellite navigation, digital communications, and digital mapping will allow leaders and Soldiers to share a common, digital picture of the battlespace environment in real time. D-3. New computer capabilities will allow leaders to decisively concentrate their battlefield combat power. High-speed digital data exchange, the simultaneous display of intelligence data to leaders at all levels, and the rapid exchange of targeting data from sensors to shooters power this increased effectiveness. D-4. New OTN capabilities enhance the ability to detect, identify, and engage targets during limited visibility. They also increase accuracy and control of fires, which reduces the risk of fratricide.

## Purpose, Advantages, And Capabilities

D-5. The main purpose of digitization is to provide access to common, current data about friendly and enemy forces. Leaders and Soldiers collect these data through networks of sensors, CPs, processors, and weapons platforms. Every leader and Soldier will have immediate access to relevant information. All Soldiers will know what is happening around and among them. Other purposes of digitization include the following:

## Information

D-6. To provide an integrated digital information network that will improve information flow; increase command and control; support battlefield fire and maneuver; and give leaders (decision makers), Soldiers (shooters), and supporters customized information. Leaders, Soldiers, and supporters need--

-  To make the decisions necessary to prevail in any campaign. -  To share vital battlefield information (friendly and enemy) rapidly,
if not instantly, rather than by slow voice radio or even slower liaison efforts.
-  To act on information faster than the enemy does. -  To win the information war against any adversary. -  To use common data collected through the digitized network.

## Situational Awareness

D-7. To achieve near real-time situational awareness at all times and at all levels. This will allow leaders and Soldiers to collect, share, and use relevant information at once.

## Operational Awareness

D-8. Greater situational awareness leads to increased operational awareness, which is better understanding the "big picture."

## Operational Tempo

D-9. A greater grasp of the "big picture" enables leaders and Soldiers to set and maintain an increased operational tempo, which will help in overwhelming the enemy.

## Lethality, Accuracy, And Survivability

D-10. To enhance the effectiveness and combat power of a force comprised of fewer and smaller units, so it can execute its missions with greater lethality, accuracy, and survivability in an environment characterized by an accelerated operational tempo, instant communications, and immediate response times.

## Planning And Preparation

D-11. To streamline and support mission planning, preparation, and execution, and to do so by providing critical information to every leader at the same time. Having earlier access to needed information compresses the mission planning and preparation cycles.

## Effectiveness

D-12. To increase the pathfinder team's effectiveness in conducting pathfinder operations for its parent unit.

## Firepower

D-13. To synchronize direct and indirect fires more effectively. To mass the effects of dispersed firepower. This replaces the existing way of fighting that relies on physically massing weapons and forces.

## Decentralization

D-14. To support more decentralized operations, thereby improving the effectiveness of team- and element-level operations.

## Battlespace

D-15. To maintain a clear, accurate, simultaneous, and appropriate vision of the battlespace at each echelon, from Soldier to commander, and to enhance the mission capabilities needed in a multidimensional battlespace.

## Fratricide

D-16. To minimize fratricide.

## Signature

D-17. To reduce the team's signature on the battlefield.

## Navigation

D-18. To improve navigation.

## Linkup D-19. To Improve Linkup. Appendix E Air Force Instruction

Air force instructions are used primarily in the establishment of CARP drop zones and used in certain cases for GMRS drop zones.

## Airdrop Airspeeds

E-1. The airdrop airspeed is used to determine additional size requirements on VIRS and GMRS drop zones using the D=RxT and T=D/R formulas. It is also used to determine the forward throw for rotary wing aircraft. See Table E-1 for the airdrop airspeeds for various aircrafts.

| Type of Aircraft         | Type of Load   | Drop Speed      |
|--------------------------|----------------|-----------------|
| (Knots                   |                |                 |
| Indicated                |                |                 |
| Airspeed)                |                |                 |
| UH-1                     | All            | 50 to 70 knots  |
| (optimum 70              |                |                 |
| knots)                   |                |                 |
| UH-60                    | All            | 65 to 75 knots  |
| (optimum 70              |                |                 |
| knots)                   |                |                 |
| CH-46 (USMC)             | All            | 80 to 90 knots  |
| CH-47                    | All            | 80 to 110 knots |
| (optimum 90              |                |                 |
| knots)                   |                |                 |
| CH-53 (USMC)             | All            | 90 to 110 knots |
| CH/HH3 (USAF)            | All            | 70 to 90 knots  |
| C-130                    | Personnel      |                 |
| (Static Line)            |                |                 |
| 130 knots                |                |                 |
| Personnel (HALO & HAHO)  | 110 to 150     |                 |
| knots (optimum           |                |                 |
| 130 knots)               |                |                 |
| Equipment/Combination ** | 130 to 140     |                 |
| knots                    |                |                 |
| CDS*/Combination **       | 130 to 140      |
|---------------------------|-----------------|
| knots                     |                 |
| Door Bundle               | 130 knots       |
| SATB                      | Same as load    |
| simulated                 |                 |
| C-17                      | Personnel       |
| (Static Line)             |                 |
| 130 to 135                |                 |
| knots                     |                 |
| Personnel (HALO and HAHO) | 138 to 145      |
| knots                     |                 |
| Equipment/Combination **  | 145 knots +/- 5 |
| knots                     |                 |
| CDS*/Combination **       | 145 knots +/- 5 |
| knots                     |                 |
| Door Bundle               | 130 to 135      |
| knots                     |                 |
| SATB                      | N/A             |
| C-141/C5A                 | Personnel       |
| (Static Line)             |                 |
| 130 to 135                |                 |
| knots                     |                 |
| Personnel (HALO and HAHO) | 130 to 180      |
| knots                     |                 |
| Equipment/Combination**   | 150 knots       |
| CDS*/Combination**        | 150 knots       |
| Door Bundle               | 130 to 135      |
| knots                     |                 |
| SATB                      | Same as load    |
| simulated                 |                 |

*  Includes free fall, high velocity CDS,
wedge, Ahkio (military cold weather, squad-sized) sled, and combat rubber raiding craft (CRRC).
** Combination airdrops (for example,
heavy equipment followed by personnel) use the highest airdrop airspeed.

## Drop Zone Size

E-2. The airlift mission commander is normally responsible for airdrop accuracy and safety-of-flight for all drop zones meeting Air Force minimum size criteria. Standard DZ sizes are shown in Table E-2. For more information, see AFI 13-217.

## Ground Marked Release System

E-3. The GMRS is mainly used for small unit insertion and aerial resupply operations. It is the most tactical drop zone because communication with the drop aircraft is not necessary. Table E-3 shows the constants for different airdrop loads. Table E-4, page E-4, shows the forward throw distance for various aircraft. Forward throw distance is how far a parachutist or cargo container travels along the aircraft flight path. It begins after the person or cargo exits the aircraft, and continues until the parachute fully opens and the load descends vertically. (For more on the GMRS, see AFI 13-217.)

| Type Drop                   |   K (Load Drift Constant) |
|-----------------------------|---------------------------|
| Personnel (static line) 3.0 |                           |
| Heavy equipment             |                       1.5 |
| CDS/CRL/CRS                 |                       1.5 |
| Door bundle                 |                       1.5 |
| SATB                        |                       2.4 |
| Type Drop          | C-130       | C-17      |
|--------------------|-------------|-----------|
| Personnel          |             |           |
| (static line)/door |             |           |
| bundle             |             |           |
| 250 yards          |             |           |
| (229               |             |           |
| meters)            |             |           |
| 250 yards          |             |           |
| (229               |             |           |
| meters)            |             |           |
| 250 yards          |             |           |
| (229               |             |           |
| meters)            |             |           |
| 250 yards          |             |           |
| (229               |             |           |
| meters)            |             |           |
| Personnel          |             |           |
| (MFF)              |             |           |
| 328 yards          |             |           |
| (300               |             |           |
| meters)            |             |           |
| 328 yards          |             |           |
| (300               |             |           |
| meters)            |             |           |
| 328 yards          |             |           |
| (300               |             |           |
| meters)            |             |           |
| 328 yards          |             |           |
| (300               |             |           |
| meters)            |             |           |
| Heavy equipment    | 500 yards   |           |
| (458               |             |           |
| meters)            |             |           |
| 700 yards          |             |           |
| (640               |             |           |
| meters)            |             |           |
| 730 yards          |             |           |
| (668               |             |           |
| meters)            |             |           |
| 730 yards          |             |           |
| (668               |             |           |
| meters)            |             |           |
| N/A                | CDS/CRS/CRL | 550 yards |
| (503               |             |           |
| meters)            |             |           |
| 725 yards          |             |           |
| (663               |             |           |
| meters)            |             |           |
| 750 yards          |             |           |
| (686               |             |           |
| meters)            |             |           |
| N/A                | SATB        | 160 yards |
| (147               |             |           |
| meters)            |             |           |
| N/A                | 160 yards   |           |
| (147               |             |           |
| meters)            |             |           |

## Point Of Impact

E-4. The point of impact is the location where the first piece of equipment or first personnel is planned to land on the DZ. These are used in computing the release point on CARP drop zones and for tactically assessed GMRS DZs for CDS or heavy equipment. For more information, see Table E-5 and AFI 13-217.

Distance from Approach End
Type Drop
Distance From Sides
(See Note 4)
Day
Night
C-130/C-141/C-5
(See Notes 1 and 2)
CDS C-130 (See
Note 3)
(See Note 4)
200 yards/183 meters
250 yards/229 meters
CDS C-141 (See
Note 3)
(See Note 4)
225 yards/206 meters
275 yards/251 meters
Personnel
(See Note 4)
300 yards/274 meters
350 yards/320
meters
Equipment
(See Note 4)
500 yards/457 meters
550 yards/503 meters
Day
Night
C-17 (See Notes
1 and 2)
CDS (See Note
3)
(See Note 4)
225 yards/206 meters
275 yards/251 meters
300 yards/274 meters
350 yards/320 meters
Personnel
Offset PI=250 yds left or right of calculated center PI
(or see Note 4)
Equipment
(See Note 4)
500 yards/457 meters
550 yards/503 meters

## Glossary

acft load
aircraft load; refers to cargo suspended below a
slingload
ACL
allowable cargo load
ACP
air control point
ADS
aerial delivery sling
AEL
Army Electronic Library
AF
Air Force
AFB
Air Force base
AFI
Air Force Instruction
AFSOC
Air Force Special Operations Command
aft
to the rear, behind, or toward the tail of the
aircraft
AGL
above ground level
AH
attack helicopter
Ahkio sled
a squad-powered sled for operations in extreme cold
AI
air interdiction
airdrop
delivery of cargo or personnel by parachute from an aircraft in flight
AL
airland
ALO
air liaison officer
alt
altitude
AM
amplitude modulation
AMC
Air Mobility Command
AO
area of operations
apex fitting
the uppermost point (clevis, shackle, ring, or loop) that gathers the sling tension members and attaches to the cargo hook
apex fitting pin
A headed pin that extends through the two ends of the apex fitting-clevis, retained in place by a
bolt and nut apex fitting spacer (an hourglassshaped bushing that fits over the apex fitting pin), causing the apex fitting to stay centered on the cargo hook
approach azimuth
the direction of an aircraft's approach to the landing point, usually expressed in degrees and measured clockwise from a reference point
arr
arrival
ASIP
advanced system improvement program
ATA
actual time of arrival
ATC
air traffic controller
ATD
actual time of departure
AWADS
All-Weather Aerial Delivery System
AZAR
assault zone availability report
basket hitch
a type of attachment in which a flat web nylon strap is formed in the shape of the letter "U" with the two ends connected side-by-side
basket leg
the cable on a pallet sling that encircles the load
becket
a short length of rope with an eye on one or both ends, used to secure items such as eyelets or coils of rope
bight
a formed loop in a rope or cable
BIT
built-in test
blivet
A rubber or fabric storage bag, transportable by air or ground, that holds fuel or water
breakaway technique
use of material with a low breaking strength, such as tape or cotton webbing, to temporarily restrain the sling equipment from becoming entangled on the load as the helicopter puts tension on the sling
breaking strength
resistance to breaking, commonly measured in pounds. (Refers to tensile strength.)
brownout
a loss of orientation with respect to the horizon, caused by blowing sand, dust, or dirt
CA
combat assault
cable
a suspended external cargo sling system. Cargo hook attached to the bottom of the fuselage by a
system of cables
CAPES
Chemlight-Assisted Personnel Exit System
cargo hoist
a device used to raise, lower, or winch cargo
cargo hook
a suspension hook device on which the apex fitting is placed to transport an external load
cargo hook keeper
a spring-loaded device used to prevent the apex fitting from sliding off the cargo hook load beam
cargo hook loading pole
also called a "shepherd's hook," with a hook on one end, which an aircrew member uses to pick up the apex fitting and connect it to the cargo hook. Used when the hookup team cannot stand on top of the load
cargo net
a meshed arrangement of straps or cords that have been knotted or woven together at regular
intervals and used to transport supplies and
equipment
cargo sling
consists of multiple tension members which, when properly rigged, enable aircrew to suspend cargo and equipment under a helicopter
CARP
computed air release point
CAS
close air support
castle nut
a hexagon-shaped nut with a slot in each of its six sides and secured in place by a cotter pin
CBRN
chemical, biological, radiological, or nuclear
CBU
cluster bomb unit
CC
control center
CCA
close combat attack
CCP
communications checkpoint
CDS
container delivery system
cellulose
a cushioning or padding material used to protect the load or sling legs
center (main) cargo hook
a cargo hook located in the center of the helicopter
center of balance
location where an item would balance if it were possible to support the load at that point
centerline
an imaginary line that extends lengthwise and bisects the bottom of the helicopter fuselage
CG
center of gravity
CH
cargo helicopter
chemiluminescent
a plastic tube filled with a liquid chemical and a glass vial that when activated
light
produces a glowing light known as chemiluminescence
choker hitch
a knot formed by placing a strap or cord around an item and passing the free end of the strap or cord through the loop formed by the other end
clevis
a "U"-shaped yoke device with a bolt or pin through the two ends
COMSEC
communications security
connector link
a metal link device that joins the ends of a nylon web loop together, such as used on the web ring
of the 15,000-pound capacity multileg sling
constant power
the point at which a helicopter engine produces a fixed level of performance
CONUS
Continental United States
CP
command post
CRC
control and reporting center
CRL
container ramp load
CRS
Container Release System
DCA
defensive counterair
dep
departure
det
detachment
DF
direction finding
down wash
also called "rotor wash." High-velocity air movement under a hovering helicopter
downslope
downhill; descending; a slope that lies downward
downwind
in the direction that the wind is blowing
drawbar
a beam across the rear of a vehicle or aircraft to which implements are hitched
drop-off
a very steep or perpendicular descent
DS
direct support
DTG
date-time group
dual-point load
cargo or equipment rigged and suspended from
two cargo hooks
DZ
drop zone
DZSO
drop-zone safety officer
DZST
drop-zone support team
DZSTL
drop-zone support team leader
ECCM
electronic countercountermeasures
ECM
electronic countermeasures
EMT
emergency medical technician
end bar
the removable side of a connector link
energy-dissipating
artificial cardboard packing material. In parachute operations, protects
material
equipment by dissipating shock or energy when the package lands
ETA
estimated time of arrival
EW
electronic warfare
exit path
the track or course of an aircraft departing the landing point extracted
ext
extracted
external air transport
movement of supplies or equipment that is rigged and suspended from a helicopter cargo hook
external load
consists of supplies or equipment properly rigged with either one or more slings, cargo bags, or cargo nets
eye sock
a loop formed at both ends of a sling leg
EZ
extraction zone
FAARP
forward area arming and refueling point
FB
Fort Benning
FEBA
forward edge of the battle area
field-expedient pendants
individual slings or sling legs used as a vertical riser or pendant a device fabricated from readily available material to discharge the helicopter's static electrical charge
field-expedient
static-discharge wand
field-expedient
drogue device
any device locally fabricated to connect to an external load for the purpose of increasing the
stability of the load
FLA
frontline ambulance
flat web nylon
a flat nylon strap or sling fabricated in either concentric loops or single lengths
floating web keepers (see sliding keepers)
FM
frequency modulated
FOC
flight operations center
forward cargo hook
a cargo hook located forward of the center or main cargo hook
forward slope
ground whose surface forms an upward angle or incline with the horizon
FRAGO
fragmentary order
free-swinging cargo hook
a cargo hook attached to the end of a pendant or
cable instead of attached directly to the
helicopter fuselage
ft
feet
fuselage
the central body portion of a helicopter, which accommodates the crew, passengers, and cargo
fwd
forward
GAIL
glide angle indicator light
GCA
ground-controlled approach
glide angle indicator light
(GAIL) A device that emits a three-color light beam that indicates a safe glide path over approach obstacles onto a landing site
glide path angle
the helicopter's angle of approach to the landing point
GMRS
Ground Marked Release System
GMT
Greenwich Mean Time
GP
general purpose
grabhook
a hook for grabbing (as the links of a chain)
ground crew
personnel on the ground who help prepare and rig loads, guide the helicopter, and connect the load to the helicopter
GSI
glide slope indicator
GTA
ground-to-air
GUC
ground unit commander
GWT
gross weight
HAARS
High Altitude Airdrop Resupply System
HAHO
high-altitude, high-opening
HALO
high-altitude, low-opening
handheld
designed to be operated while held in the hand
HE
heavy equipment
HEAT
helicopter external air transport
HLZ
helicopter landing zone
HMMWV
high-mobility, multipurpose wheeled vehicle
HO
HALO or HAHO
HSLLADS
High-Speed, Low-Level, Aerial Delivery System
HVCDS
High-Velocity Container-Delivery System
IAW
in accordance with
ID
identification
ILS
Instrument Landing System
immediate mission
a task or support mission that arises during the course of a battle and which by its nature cannot be planned in advance
INR
internal net recorder
ins
inserted
ISA
international standardization agreement; see also QSTAG, STANAG
JAAT
joint air attack team
JP
jet petroleum
keeper
a device that holds something in position such as an apex fitting on the helicopter cargo hook
KIAS
knots indicated airspeed
knotless nylon cord cargo net
a cargo net manufactured from braided nylon cord joined by a knotless intersection method
kt
knot(s)
landing point
a point within a landing site where one helicopter can land
landing site
a site within a landing zone that contains one or more landing points. This is also known as the
touchdown point
landing zone
any specified area used for the landing of aircraft
lanyard
a short piece of rope or cable used to fasten something or an extension of a shorter device
lashing straps
a flat-web nylon strap with a D-ring on one end. Used to lash equipment together
latch bar
the movable top part of the pallet sling tensioner
lateral slope
ground whose surface forms an angle oriented from either right to left or left to right with the horizon
lb
pound(s)
lifting eye
a loop in a cable, rope, or other device used to lift an object
lifting leg hook
a hook on the end of a sling leg, usually used
with a hoisting sling
lifting point/ lifting provision
an integral part of the equipment, commonly called a lug, eye, shackle, or ring that provides a means of attaching a sling for safe lifting
lifting shackle
a ring or clevis that provides a means of attaching sling for safe lifting
liftoff
a vertical takeoff by an aircraft or a rocket vehicle or a missile
LIN
line item number
load beam
a structural member of the cargo hook that supports the weight of the external load
load binders
a locking device used to tighten and secure
load oscillation
the swinging movement of an external load
locking detent
a slot in the pallet sling tensioner stirrup that engages the release knob assembly on the latch bar a cargo hook attached to a suspension frame below the fuselage by a system of cables and pulleys
low-response, external cargo sling system
lunette
the towing eye on the trailer drawbar
LZ
landing zone
MAC
Military Airlift Command
MAF
Military Airlift Facility
main cargo hook winch
a mechanical drum with a cable attached to raise
and lower the cargo hook
manual release knob or lever
a lever, knob, or other device that, when actuated by either the ground crew or aircrew member, causes the cargo hook to open
mean effective wind the average wind speed from the ground to drop
altitude
MEDEVAC
medical evacuation
METT-TC
mission, enemy, terrain, troops, time, and civil considerations
MEW
mean effective wind
MFF
military free fall
MGRS
military grid reference system
MK 100
(Mark 100) the designation given to the pallet
sling that can accommodate a pallet load 48 to 70
inches high
MK 86
(Mark 86) the designation given to the pallet sling that can accommodate a pallet load 29 to 40 inches high
MOGAS
motor gasoline
MPS
meters per second
MSL
mean sea level
multileg-pole pendant
A reach pendant that has one or more removable sling legs
NATO
North Atlantic Treaty Organization
NAVAID
navigation aid
NCO
noncommissioned officer
night vision goggles
an image-intensification device that improves visibility in low light situations by amplifying available light
NLT
not later than
NM
nautical miles
no-load condition
a situation in which the sling legs are under no tension
no-sew fitting
a web keeper secured in place by a locking fork
NSN
national stock number
NVD
night vision device
NVG
night vision goggles
nylon donut
a ring formed by joining two ends of a flat, webnylon strap using a Type IV link or two-point link connector
OCA
offensive counterair
OPCON
operational control
OPORD
operation order
oscillate
to swing back and forth like a pendulum
OTN
own the night
overfly
to fly over; to pass over in an airplane
pendant
a releasable swivel hook. That is, a high-strength sling constructed of multiple plies of nylon webbing with a remotely operated, manually
released, full 360-degree swivel hook
pendant cargo hook
a cargo hook that is connected to the end of a strap and suspended below the fuselage
PEPI
personnel point impact
permanent keeper
a web keeper that encircles all of the loops of a nylon web strap and is either sewn or otherwise retained in place
phraseology
a manner of organizing words and phrases into longer elements; a choice of words
PI
point of impact
PIBAL
pilot balloon
pickup zone
landing site designated where an aircraft picks up passengers or cargo
piggyback load
cargo suspended below a slingload such as a cargo net carried beneath a howitzer
POL
petroleum, oils, and lubricants
port side
the left-hand side (as one looks forward)
preclude
to make impossible by necessary consequence; to rule out in advance
preplanned mission
a task or support in accordance with a program planned in advance of the operation
proword
procedure word; a word or phrase limited to radio telephone procedure used to facilitate
communication by conveying information in a
condensed standard form.
PSP
perforated steel planking
PZ
pickup zone
QSTAG
quadripartite standardization agreement
quick-fit strap fasteners
metal, V-shaped device with a double bar and a friction-grip crossbar. Used with lacing straps
racetrack
to fly in an oval flight pattern over a drop zone or point of impact
RAM
raised-angle marker
RB
radar beacon
reach pendant
braided fabric rope assembly with an attached, stiffened reach tube and a loop on each end
reach tube
a length of tubing that encases the braided rope
portion of a reach pendant
receiving unit
a unit receiving the transported supplies and equipment
recon
reconnaissance, reconnoiter
relative humidity
the ratio of absolute humidity to the maximum possible density of water vapor in the air at the same temperature
rendezvous point
a clearly defined and visible point or assembly area for the ground crew during helicopter operations
retainer strap
nylon web loop interwoven on the web ring of the 15,000-pound capacity multileg sling that retains the sling legs on the lower part of the web ring
retention pins
metal devices used to secure objects such as clevises or shackles to the vehicle frame
RIO
radar intercept officer
rope lay
an individual grouping of wire strands woven or twisted together, which when braided together form a cable
rotor wash
(See down wash.)
RP
release point
SADL
situational awareness datalink
safe working load
the greatest capacity of a lifting device used in
helicopter external load operations
SAM
surface-to-air missle
SATB
simulated airdrop training bundle
SATCOM
satellite communications
SEAD
suppression of enemy air defenses
SIGINT
signals intelligence
signalman
A person who signals or who works with signals, or a member of the ground crew who communicates with the pilot by means of armand-hand signals
SIGSEC
signal security
SINCGARS
Single-Channel, Ground and Airborne Radio System
single-point load
cargo or equipment rigged and suspended from
one cargo hook
SKE
station-keeping equipment
sliding keeper
a web keeper located near the ends of a flat web strap that encircles all of the loops and acts as a cinch
sling leg
An individual tension member of the sling set
slingload
Consists of supplies or equipment properly rigged with either one or more slings, cargo bags, or cargo nets
sling-to-clevis attachment
Connecting a flat web nylon strap to a lift provision by means of inserting a clevis through the loop on the end of the strap and attaching the clevis to the provision
SOI
signal operating instructions
SOP
standing operating procedure
SPIES
Special Patrol Insertion Extraction System
spreader bar
A device that prevents the sling legs from bearing against the load, which could cause damage
STANAG
standard NATO agreement
starboard side
The right-hand side (as one looks forward)
static discharge
wand crewman
A member of the ground crew responsible for discharging the static electricity from the
helicopter. Also called "static probe crewman."
static electricity
A electrical charge produced and stored in the helicopter fuselage during flight
STOL
short takeoff and landing
STT
special tactics team
supported unit
A unit requesting the mission to transport supplies and equipment
swage stops
Short lengths of metal tubing crimped on the pallet sling cables
tandem load
An external load consisting of two pieces of equipment joined together, such as a prime mover and a howitzer
TDP
touchdown point
tensioner
A locking device on the pallet sling cables used to
adjust the overall length of the cable
tensioner stirrup
The fixed body of the pallet sling tensioner
theodolite
A surveyor's instrument for measuring horizontal and, usually, also vertical angles
tie-down provision
An integral part of the equipment commonly called a lug, eye, shackle, or ring that provides a means of attaching a hook, strap, or cable to restrain equipment during shipment
tie-down strap
A device consisting of a flat web nylon strap with hooks on one or both ends and a ratchet device used to secure items
TOT
time on target
touchdown hover
a helicopter landing with only part of the landing gear positioned on the ground
TOW
tube-launched, optically tracked, wire-guided missile
transit
to pass across
TSC
Training Support Center
TTB
tactical training bundle
TTB/CDS
tactical training bundle/Container Delivery System
TTB/HE
tactical training bundle/heavy equipment
turbo meter
an instrument for measuring ground wind speed
turnaway
the act of refusing admittance
turnout
an act of turning out
two-point link connector
a device used to connect two ends of a flat web nylon strap together
Type III nylon cord
a thin rope made of several strands of Type III nylon woven together
Type IV link connector
a device used to connect two ends of a flat web nylon strap together
Type X sling
a nylon aerial delivery sling consisting of two, three, or four consecutive loops of Type X nylon webbing
Type XXVI sling
a nylon multiloop-line sling consisting of two or more consecutive loops of Type XXVI nylon webbing
UH
utility helicopter
UHF
ultra-high frequency
upslope
a slope that lies upward; uphill
upwind
the direction from which the wind is blowing
USAF
US Air Force
USCG
US Coast Guard
USMC
US Marine Corps
USSOCOM
United States Special Operations command
VAPI
visual approach-path indicator
VDC
volts of direct current
vertical pendant
a high-strength sling or strap used to increase the clearance between the helicopter and the load
vertical riser
a suspension member oriented in a vertical direction
VHF
very high frequency
VIRS
Verbally Initiated Release System
VMC
visual meteorological conditions
V-shaped approach
path
the area within a designated arc or sector measured outward from the center of the landing point
web ring
the apex fitting of the 15,000-pound capacity, multileg sling set
web ring connector bar
a metal connecting link that joins the two ends of
the web ring strap on the 15,000-pound capacity, multileg sling
web ring strap
a nylon web loop that forms the web ring on the 15,000-pound capacity, multileg sling
whiteout
a loss of orientation with respect to the horizon due to caused by blowing snow, the sun reflecting on the snow, or an overcast sky
windchill factor
the cooling effect of moving air
yd
yard(s)

## References Sources Used

These are the sources quoted or paraphrased in this publication.

## Army Publications

FM 3-21.220. *Static Line Parachuting Techniques and Tactics*. 23
September 2003.
FM 1-02. *Operational Terms and Graphics*. 21 September 2004. FM 10-450-3. Multiservice Helicopter Slingload: Basic Operations and
Equipment. 10 April 1997.
FM 21-60. *Visual Signals*. 30 September 1987. FM 24-18. *Tactical Single-Channel Radio Communications Techniques*. 30
September 1987.
FM 24-24. *Signal Data References: Signal Equipment*. 29 December 1994.
TM 9-1370-206-10. *Operator's Manual for Pyrotechnic Signals*. 31 March
1991; with Change 1, 10 March 1992.

## Air Force Instructions

AFI 11-231. *Computed Air Release Point Procedures*. 7 July 2004. AFI 11-410. *Personnel Parachute Operations*. 20 May 2004. AFI 13-217. *Assault Zone Procedures*. 1 May 2003; with four
supplements published between 1 October 2003 and 15 May 2004.

## Documents Needed

These documents must be available to the intended users of this publication.

## Air Force Forms

AF IMT 3823. *Drop Zone Survey*. AF IMT 4304. *Drop Zone Control Log*.

## Army Publications

FM 3-97.6. *Mountain Operations*. 28 November 2000. FM 90-3. *Desert Operations*. 24 August 1993. FM 90-4. *Air Assault Operations*. 16 March 1987.
FM 90-5. *Jungle Operations*. 16 August 1982.

## Department Of The Army Forms

DA Form 2028. *Recommended Changes to Publications and Blank Forms*. DA Form 7382-R. *Sling Load Inspection Record*. DA Form 7461-R. *Internal Net Record*.

## International Agreements*

QSTAG 585. *Marshaling Helicopters in Multinational Land Operations*. 23
April 1981.
STANAG 2863. Navigational and Communication Capabilities for
Helicopters in Multinational Land Operations. 26 September 1988.
STANAG 3117. *Aircraft Marshaling Signals*. 17 October 1985. STANAG 3281. *Personnel Locator Beacons*. 3 April 1978. STANAG 3570. *Drop Zones and Extraction Zones--Criteria and Markings*.
26 March 1986.
STANAG 3619. *Helipad Marking, Third Edition*. 20 March 1997.

## Internet Web Sites

Some of the documents listed in these References may be downloaded from Army websites:

U.S. Army Publishing Directorate (USAPD)
http://www.usapa.army.mil

Army Doctrine and Training Digital Library (ADTDL)
http://www.adtdl.army.mil

Air Force Publishing
http://afpubs.hq.af.mil/

NATO Online Library (for International Standardization Agreements
[ISAs])
http://www.nato.int/docu/standard.htm
* To requisition copies of standardization agreements, send a completed DD Form 1425 (*Specifications and Standards Requisition*) to Naval Publications and Forms Center (NPFC), 5801 Tabor Avenue, Philadelphia, PA 19120.

## Index

360-degree turnout (*illus*), 3-9
ACL. See allowable cargo load ADS. See aerial delivery slings advanced system improvement program (ASIP), 6-23
advisories, 1-1, 2-6, 3-8, 3-15 (*illus*), 4-3, 4-11 aerial delivery slings, 5-3 (*illus*), 5-10 (*illus*)
aerial marker, distress, 6-22
AF forms. See forms air assaults, 2-6, 4-10, 4-14 air control points, 2-9, 4-24
aircraft drag coefficient, 5-21 load limitations, 5-16 points of attachment, 5-12 separation requirements, 3-10 taxiing, 3-10
airdrop, 6-1, 6-3 (*illus*), 6-4, E-1 (*illus*)
accuracy, E-2 airspeeds, E-1 static line, 6-12, 6-19, E-1 surface wind limits, 6-29
tactically assessed drop zones, on, 6-48 (*illus*)

Air Force, 1-2
computed air release point, 6-40 drop zone sizes, E-2
forms. See forms instruction, E-1 support of, 2-8
Verbally Initiated Release System (VIRS), 6-31 (*illus*), 6-40 (*illus*)
airlift, 5-19, 6-2, 6-9 (*illus*), 6-10 (*illus*), 6-18, 6-48, E-2
air medical evacuation, coordination, 2-2, 5-29
plan, 2-3 (*illus*)
requests, 3-1
air movement table, 2-2 (*illus*) air routes, 2-10, 2-11 (*illus*)
air traffic control, 3-1
aircraft separation requirements, 3-11 assault, in an, 2-6 communications, 3-12 electronic warfare, 3-12 establishment of, 2-7 external loads and, 5-2 light, 6-27
phrases, 3-4 (*illus*)
positive, 2-6 safety, 3-1 spacing techniques, 3-9
taxiing aircraft, 3-10
terms, 3-5 (*illus*)
traffic pattern legs, 3-8
visual signals, 3-12, 3-13 (*illus*)
voice control, 3-1
allowable cargo load (ACL), 4-31, 5-16, C-12 alternate landing sites, 4-10 altitudes, airdrop, 2-2, 6-3 (*illus*)
civil, 3-6 density, 4-9 drop, 6-2 modes, 2-10
terrain flight, 3-17, 4-23 (*illus*)
AN/PRC-119A (SINCGARS) radio, 6-22 anemometers, 6-19 approach path, 4-7, 4-34, 6-18 arrival record, 3-12, 3-16, 4-10, 4-29, 5-29, 6-55, B-2
artillery, 1-2, 2-7, 5-19, 5-20 (*illus*) ASIP. See advanced system improvement program assaults, 2-6, 4-14 assault zone availability report (AZAR), 6-47
assembly aids, 1-3, 2-1, 2-13, 4-141 points, 4-14
base leg (approach), 3-8 (*illus*), 3-9 (*illus*), 3-10
briefing aids, 2-2 aircrew mission briefing, 6-37 DZST, 6-18, 6-37 initial preparation, 2-1 landing site party, 4-12
operation plan, 4-8, B-3 (*illus*), B-6
radio operator, 4-12
site team leader, 4-12
weather and operational, 2-4
brownouts, 4-3, 4-32, 5-29 capabilities, pathfinder, 1-2 cargo aircraft, 4-26
bag, 5-5 (*illus*)
bulk, 4-22 containers, 5-4 emergency release, 5-19, 5-28 helicopters, 4-34
hooks, 5-7, 5-16 thru 5-18 (*illus*), 5-26 landing site, 3-14 (*illus*), 4-18 (*illus*)
loads, external, 4-27, 5-1
nets, 5-4, 5-5 (*illus*), 5-20
safety, 3-12 slope, 4-5 straps, 5-10 tie-downs, 5-11, 6-20
"V" formation, 4-8 (*illus*), 4-18 (*illus*)
CARP. See computed air release point

## Ccp. See Communications Checkpoint

CDS. See container delivery system civil altitude, 3-6
clearance, 3-1, 4-7
departure, 3-4 (*illus*) horizontal, 4-7, 6-36 (*illus*)
instructions, 3-3
obstacles, 2-7, 4-27, 6-36 (*illus*), 4-6 phrases, 3-4 (*illus*) ratio, 6-36, 6-37 (*illus*)
to drop, 6-30 to ground level, 4-3
to land, 3-2 (*illus*), 3-10
close air support, A-1 close combat attack, A-1
closed traffic, 3-4 (*illus*), 3-6
cold weather, 4-28, E-1 communications, 2-8
checkpoint (CCP), 2-4, 3-12, 4-22
code letters, 6-30, 6-43 (*illus*)
cold weather, 4-28, E-1 compatibility, 1-2, 2-8 desert, 4-32 equipment, 1-2, 3-17 formats, 3-2 ground to air, 1-2, 3-2, 3-12, 6-23, 4-9, 4-12 jamming of, 1-5, 2-8 jungle, 4-31 mountain, 2-10, 3-8, 4-33 net, 3-12, 3-17, 4-13, 4-23, 4-24 radio, AN/PRC-119A (SINCGARS), 6-22 terrain, 4-28, 4-31, 4-33
communications security, 1-5, 3-17, 6-23 computed air release point (CARP), 6-4
Air Force, 6-40
drop zone, 6-9 (*illus*), 6-10 (*illus*), 6-13 (*illus*), 6-21 (*illus*)
additional platforms, 6-11 Air Force instructions and, E-1
bundles, 6-13
container delivery system (CDS), 6-10 heavy equipment, 6-9 parachutists, 6-13 personnel, 6-9 point of impact, E-4 raised angle marker, 6-21
markings, 6-28 personnel, 6-9
sunset to sunrise, 6-9 (*illus*)
COMSEC. *See* communications security and signal security.

conduct of operations, 2-6
container delivery system, 6-2 (*illus*), 6-4 (*illus*), 6-5 (*illus*), 6-10 (*illus*),
6-45, E-2 (*illus*)
contour, terrain, 4-35 control center, 3-12, 4-1, 4-10, 6-29 log, 6-54
method of delivery and, 6-4 (*illus*)
conversion charts, PIBAL, 6-16 (*illus*), 6-17 (*illus*) coordination. *See also* signals air movement phase, 2-2 (*illus*), 4-10 checklist, 6-24 (*illus*)
electronic warfare, 3-12 final, 2-4, 4-10 linkup with supported unit, 2-4 premission, 6-27
release point, 2-2 (*illus*), 4-1, 6-4, 6-28, 6-31 (*illus*), 6-40, 6-54
signalmen, 3-10, 4-14, 4-27, 4-34, 5-22, 5-26, times, 2-1 troop-leading procedures, B-5 warning order, 2-1

## Da Forms. See Forms

danger statements. *See* safety daylight assault. *See* assaults debriefing, 6-56
decentralized operations, D-2
deception, 1-5, 2-8 density altitude, 4-9, 4-31 departure clearance, 3-4 (*illus*)
commander, 4-11 directions, 4-7 final coordination, 2-4 instructions, 3-15 internal net record, 4-11 lights, 3-15 log, 4-11 obstacle ratio, 4-32
obstacles, 3-15
record, B-2 routes, 4-10, 4-34, 6-18, 6- time, 6-54, B-5 traffic patterns and, 3-6
desert terrain, 4-32 direction-finding systems, enemy, 1-5 distress marker, aerial, 6-22 drift scale, 6-22 drop altitude, 6-2 drop heading, 6-31 drop zone airdrop airspeeds, 6-1
control records, B-2, B-4 (*illus*)
coordination checklist, 6-24 (*illus*)
estimation of time, 6-13 (*illus*), 6-20, 6-25
obstacles, 6-6
placement, 6-42 (*illus*)
selection factors, 6-1
size, 6-9, E-2 (*illus*)
survey, 6-47, 6-49 (*illus*)
Drop Zone/Landing Zone Control Log. See forms drop zone support team(DZST), 6-18
assault zone availability report (AZAR), 6-47 computed air release point, Air Force, 6-40 control group, 6-25
coordination checklist, 6-24 (*illus*)
ground marked release system (GMRS), 6-32 leader, 6-28 missions, 6-19
Drop Zone Survey. *See* forms

electronic warfare, 3-12
emergency. *See also* safety cargo release procedures, 5-28
codes, 4-23
conduct, 5-25 in-flight, 3-16 landings, 2-5
lighting, 4-26 (*illus*)
mayday, 3-5 medical technician, 1-1 procedures, helicopter, 5-29 signal mirror, 6-22 tactical, 2-10
environment cold weather, 4-28, E-1 desert terrain, 4-32 high threat, 2-9 jungle terrain, 4-31 mountainous, 2-10, 3-8, 4-33

equipment, 1-2, 1-4, 2-1, 2-4, 3-12
airdrop airspeeds, E-1 airdrops, 6-47 assembly aids, 1-3, 2-1, 2-13, 4-141 circular drop zones and, 6-44 drop zone support team, 6-18
external loads, 4-27, 5-1, 5-18 (*illus*)
favorable conditions for forward throw distances, 3-18
heavy, 6-2, 6-4, 6-5 (*illus*), 6-9 (*illus*)
drops, 6-18 operations, 6-14
escape routes, 4-35 estimate of the situation, 4-1, B-5
extension, traffic pattern, 3-9, 3-10 (*illus*) external loads, 4-27, 5-1, 5-18 (*illus*)
extraction, 2-7, 4-2 final glide, 3-11 format control record, B-4 (*illus*) operation plan, B-3 (*illus*)
formations, "V" type, 4-8 (*illus*), 4-18 (*illus*)
flight, 4-3, 4-13
forms AF IMT 3823, *Drop Zone Survey*, 6-31, 6-46, 6-51 (*illus*), 6-52 (*illus*) AF IMT Form 4304, *Drop Zone/Landing Zone Control Log*, 6-54, 6-57
(*illus*)
DA Form 7382, *Sling Load Inspection Record*, 5-29, 5-30 (*illus*) DA Form 7461-R, *Internal Net Record*, 4-11, 4-12 (*illus*)
formulas D=KAV, 6-14 (*illus*) D=RT, 6-12 (*illus*) T=D/R, 6-13 (*illus*)
forward throw, 6-18 (*illus*), E-1, E-4 (*illus*) glide path, final, 3-11 (*illus*)
go-around, 3-4 ground crew, 4-30
slope, 4-5, 4-6 (*illus*), 4-28
tactical plan, 4-1, 4-13, B-5 to air (GTA), 3-2, 3-12, 3-13, 6-23
ground marked release system (GMRS), E-3 (*illus*)
Air Force Instructions and, E-1
control center, 6-29
drop zone, 6-12
forward throw distances, E-4 (*illus*)
load drift constants, E-3 markings, 6-37
release point, 6-31 (*illus*), 6-32
helicopters, A-1 (*illus*)
AH-64A (Apache), C-4, C-5 (*illus*) AH-64D (Longbow Apache), C-6, C-7 (*illus*) CH-47D (Chinook), C-12, C-13 (*illus*) OH-58D (Kiowa), C-2, C-3 (*illus*) UH-1H (Iroquois), C-8, C-9 (*illus*) UH-60AL (Blackhawk), C-10, C-11 (*illus*)
hitches, 5-4 (*illus*)
hooks, cargo, 5-7, 5-16 to 5-18 (*illus*), 5-26
hookup and release, 5-22 hookup men, 5-26
horizontal clearance, 4-7, 6-36 (*illus*), 6-37 (*illus*)
initial assembly points, 4-14 contact, 3-14, 4-11 preparation, 2-1
insertion, 2-5, 4-2, E-3
intercept heading, 4-13, 4-22 (*illus*) Internal Net Record. See forms internal net recorder (INR), 4-11, 4-12 (*illus*), 4-24 inverted "Y," 4-14, 4-25 (*illus*)
jungle terrain, 4-31 landing, 3-6
clearance for, 3-2 (*illus*), 3-10
formation(s), 2-4, 2-7, 4-3, 4-4 (*illus*), 4-13, 4-23, 4-29 (*illus*)
instructions, 3-10, 3-15, 4-13

landing point (debarkation point), 2-5, 3-12, 3-14, 4-1, 4-2 (*illus*), 4-3
(*illus*), 4-7 (*illus*), 4-8 (*illus*), 4-9 (*illus*), 4-13, 4-19 (*illus*), 4-25, 4-26 (*illus*), 4-28, 4-35, 5-1
desert operations, 4-32
separation requirements, 3-11 (*illus*)
landing site(s), 4-1. *See also* obstacles, landing zone, slingloads alternate,
4-10 approach and departure directions, 4-7 attached personnel, duties of, 4-12 communications, 4-13 checkpoint, 2-4, 2-7, 3-12, 3-17, 4-22, 4-31 control center, 4-10, 6-29 control records, B-2 density altitude, 4-9, 4-31, 4-34
ground slope, 4-5, 4-6 (*illus*)
leader, 4-14
lighting, 4-25, 4-26 (*illus*) marking, 2-3, 4-10, 4-13, 4-14, (*illus*), 4-28
patterns, 6-32 safety, 6-7
"V" formation, 4-8 (*illus*), 4-18 (*illus*)
multiple, 4-30 operations, 4-13 party, 4-12 prevailing wind, 4-7 security personnel, 4-24 selection of, 4-3
symbols, 4-21 (*illus*)
landing zone operations, 4-22 *See also* landing site leg (approach), 3-6, 3-8 (*illus*)
liaison, 2-2, 2-7, 3-12, 5-29, D-1 light AN/PRC-77, 6-21 baton (M-2), 6-22
emergency, 4-21 (*illus*)
gun, 4-23
signals, 3-1, 3-13 (*illus*)
Whelen, 6-21
limitations aircraft, 5-1, 5-16 pathfinder, 1-2
linkup, 2-4, D-3 loads, 5-1
external, 3-15, 4-1, 4-9, 4-27, 5-1, 5-19 (*illus*)
limitations, aircraft (ACL), 5-1, 5-16
safe, 5-9 (*illus*) sling. See slingload M-2 light baton, 6-22
mask clearance, 6-37 (*illus*)
mean effective wind, 6-14, 6-22, 6-55
measuring, 6-14
medical evacuation (MEDEVAC), 3-1, 3-10, 6-28 metal air items, 5-4, 5-11 methods of delivery, 6-4 methods of entry, 3-6
minimum separation requirements, 3-11 (*illus*)
mirror, signaling, 6-22 mountains, 2-10, 3-8, 4-33 movement overland, 2-5 multiple helicopter operations, 4-34 landing sites, 4-30
NATO landing "T," 4-14, 4-25 (*illus*)
navigation, 4-31
aids, 1-2, 4-24
night, 2-5, 4-8, 4-9, 4-23, 4-24, 6-22, 6-42
airdrop altitudes, 6-3
approaches, 4-8 (*illus*), 4-30
assault, 2-6
cargo landing site, 4-18 (*illus*)
communications, 2-7 control center, 4-11
drop zone support team, 6-18
emergency lighting, 4-26 (*illus*) external loads, 4-27, 5-1, 5-18 (*illus*)
flight leader, 3-15
formations, 4-20 (*illus*), 6-9 (*illus*), E-3 (*illus*)
helicopter landing zones, 4-1 infrared navigation aids, 1-3 insertion by parachute, 2-5
landing lights, 4-25 (*illus*) landing sites, 4-19 thru 4-20 (*illus*)
landing symbols, 4-21 (*illus*)
lighting unit, 6-22 multihelicopter operations, 4-34
pilot balloon (PIBAL), 6-14 to 6-17 (*illus*) rotary-wing aerial delivery, 5-3 (*illus*), 6-4 (*illus*)
signals, 4-19, 6-29 site team leader, 4-13
slingload operation site, 4-17 (*illus*)
spacing, 5-1 tactical landing lights, 4-25 touchdown point markings, 4-25 (*illus*)
vision, 4-27 visual navigation aids, 1-3
night operations, 2-6, 4-7, 4-8 (*illus*), 4-9, 4-14, 4-17 to 4-21 (*illus*), 4-22,
4-23, 4-24, 4-25 (*illus*), 4-26 (*illus*), 4-30, 6-9
night vision goggles, 1-3, 4-3 (*illus*), 4-27, 6-27 numbers, transmittal of, 3-3(*illus*)
obstacles, 4-10, 6-6
advisory information, 3-15 advisory services, 3-8 air assaults, 4-10 approach path, 4-7, 4-34, 6-18 checkpoint, 4-22
ground to air, 1-2, 2-8, 3-12, 3-14, 4-11, 4-24
clearance, 2-7, 4-27, 6-36 (*illus*), 4-6
communications, 3-12
control center, 3-12, 4-1, 4-10, 6-4, 6-29, B-2
coordination, 4-7 (*illus*)
departure, 2-2, 3-15 drop heading, 6-31 height, 3-6, 4-35 identification of, 4-9 jungle, 4-31
marking, 2-3 (*illus*), 4-14, 6-36
ratio, 4-7, 4-31 reconnaissance, 6-28 removal of, 2-4, 2-6, 4-3, 4-5 risk assessment and, 6-26
snow, 3-15, 4-3, 4-28, 4-29 (*illus*), 5-24
spacing between loads, 5-1
terrain contour, 4-35
operation decentralized, D-2 ground, 2-7, 4-28, 6-48 landing site, 4-13 landing zone, 4-22 mixed, 2-7 multihelicopter, 4-27 night, 2-5, 4-8, 4-9, 4-23, 4-24, 6-22, 6-42
plan, format, B-1, B-3 (*illus*)
plan, tentative, B-6 stay-behind, 2-6
organization combat, 2-4 helicopter landing zone, 4-10 drop zone support team, 6-18
overland movement, 2-5
panel markers, VS-17, 4-14, 6-6, 6-20, 6-21 (*illus*), 6-27, 6-32, 6-37
path, final glide, 3-11
pathfinder. See also communications, control center, equipment, organizational capabilities,
1-2
duties, 2-2, 4-10, 5-26, 6-27
ground unit(s), 1-6, 2-1, 2-4 , 3-1, 3-12, 3-16, 4-14
commander, 2-2 thru 2-3 (*illus*), 2-4, 2-7, 2-9, 4-1, 4-10, 4-28, 4-32,
6-1, 6-43, A-3
initial preparation, 2-1 insertion, 2-4 internal net, 4-11 limitations, 1-2 night assault, 2-6 stay-behind operations, 2-6
patterns, air traffic, 3-7 (*illus*) legs, 3-8, 3-9 (*illus*)
personnel drops, 6-5 (*illus*), 6-19, 6-25, 6-29
phrases, air traffic control, 3-2, 3-4 (*illus*) PIBAL. *See* pilot balloon pilot advisories, 1-1, 2-6, 3-8, 3-15 (*illus*), 4-3, 4-5, 4-10, 4-11 pilot balloon (PIBAL), 6-15, 6-16 (*illus*), 6-17 (*illus*)
planning, 2-1
coordination, 2-2 thru 2-3 (*illus*), 3-12 checklist, 6-24 (*illus*)
decentralized operations, D-2 direction finding, 1-5 final, 2-4, 4-10 initial preparation, 2-1 liaison, 2-2, 2-7, 3-12, 5-29, D-1 linkup, 2-4, D-3 reorganization, 2-1, 2-7 security, 1-5, 3-17, 4-24, 6-23
position of the sun, 4-35 preparations, 2-1 prevailing wind, 4-7 radios AN/PRC-77, 6-21 AN/PRC-113 (Have Quick), 6-23 AN/PRC-119A (SINCGARS), 6-22
raised angle marker (RAM), 6-21 (*illus*)
ratio mask clearance, 6-36 obstacle, 4-7, 4-31
reach pendant, 5-7 reconnaissance party, 4-10 release point, computed air, 6-4, 6-9, 6-40
location, 2-2, 6-31 (*illus*)
party, 4-10
reorganization, 2-1, 2-7 reporting points, 3-9
rescue boat, 6-26
rigging supplies, 5-20
rotary-wing aerial delivery, 5-3(*illus*), 6-4 (*illus*), 6-10 (*illus*) roundsling, 5-8, 5-9 (*illus*)
route(s), 2-2, 2-4, 2-9
air, 2-10, 2-11 (*illus*)
approach and departure, 4-7, 4-34, 6-18 escape, 4-35
safety advisories, 3-8 air traffic control, 3-1 airdrop, 6-4, 6-29, 6-48 cargo hook, 5-15, 6-18 cold weather, 4-28, E-1 continuous support, 2-4, 2-7 desert, 4-32 drop zone, 1-6 emergency cargo release, 5-28 equipment, 5-22 evacuation to rendezvous point, 5-29 flight formation, 4-13 frostbite, 4-30 high drag coefficient, 5-20
hookup and release, 5-22
night vision goggles, 4-27 obstacles, 6-8 overflight of personnel, 3-12 power lines and poles, 6-7 rotor wash, 4-30 simultaneous exit, 6-4 sling set, 5-13 straight-in approach, 3-7 suspended loads, 5-26 tactical light set, 4-27
search and rescue, 3-12
security, 1-2, 2-2, 3-16, 4-13, 4-24, 4-32, A-1. *See also* signal security separation requirements, 3-11 (*illus*)
signal lights, 3-13 (*illus*)
signal security, 1-5, 3-17, 6-23

signal(s), 1-3, 1-5, 2-3 (*illus*), 3-3 (*illus*), 3-12, 3-13 (*illus*), 4-23, 5-24, 5-26
arm and hand, 2-8, 4-24, 5-24 mirror, 5-22 no drop, 6-27 visual, 3-12, 4-23, 6-30
signalman, 3-10, 4-14, 4-25, 4-28, 4-30, 4-34, 5-22, 5-25
SIGSEC. See signal security site assessment, 4-34

sling sets, 5-3, 5-7, 5-12 (*illus*)
coupling link, 5-14 (*illus*) grabhook, 5-14, 5-15 (*illus*)
safety, 5-13
slingload theory, 5-21

slingload, 4-17 (*illus*), 4-19 (*illus*), 5-1. *See also* hitches
cargo helicopters, C-12 equipment, 5-2
Inspection Record. See forms
operations, 4-30
safety, 3-12, 5-26 theory, 5-21
types, 5-1, 5-3 (*illus*)
snow, 3-8, 3-15, 4-3, 4-28, 4-29 (*illus*), 5-24, 5-29
spacing techniques, 3-9 specific tactics team, 1-2 staging areas, 2-7 static discharge wand, 5-24 static electricity, 4-31, 5-22 supplies, 2-6, 4-5, 4-14, 4-30
rigging, 5-2, 5-10, 5-19
support Army aviation, 2-7 ground operations, 1-5, 2-7, 4-28, 6-48
ground-to-air communications, 3-12, 6-23 mixed operations, 2-7 terminal guidance, 1-5, 2-9 requirements, DZST, 6-25
supporting unit, 5-2
surface wind, 6-14, 6-28 (*illus*), 6-32, 6-54
suspended loads, 2-5, 5-27, 5-54 tactical assessment, 6-31, 6-47 (*illus*)
instrument flight, 2-9 landing lights, 4-25
taxiing aircraft, 3-10 team(s), 2-9, 3-1, 6-29 terminal guidance, 2-9
terms, air traffic control, 3-4 (*illus*) and 3-5 (*illus*)

terrain, 2-2, 2-5, 2-10, 3-8, 3-16, 4-10, 4-13, 4-22, 4-23 (*illus*), 4-25, 4-28,
4-31, 4-34, 5-29, 6-18, 6-36, 6-42, 6-46, B-6
See also communication types, 4-31
theater missile defense, A-1
threat. *See also* advisories environment, 2-9, 2-11 (*illus*), A-2 (*illus*)
touchdown point, 3-14, 4-1, 4-14, 4-25 (*illus*), 4-26
traffic patterns, 3-4 (*illus*), 3-5 (*illus*), 3-6, 3-7 (*illus*), 3-8 (*illus*), 3-10 (*illus*) training, 1-5, 3-1, 3-12, 4-14, 4-32, 6-1, 6-2 (*illus*), 6-3 (*illus*), 6-18, 6-26,
6-28 (*illus*), 6-46, A-2 (*illus*), E-4 (*illus*)
turnout, 3-9 (*illus*)
unit responsibilities, 5-2 vector count, 6-39
Verbally Initiated Release System (VIRS), 6-31 (*illus*), 6-40 (*illus*)
vertical air currents, 4-34
"V" formation, 4-14 (*illus*)
voice control, 2-9, 3-1
VS-17 panel marker, 4-14, 6-6, 6-20, 6-21 (*illus*), 6-27, 6-32, 6-37
warning order, 2-1, B-5
warning statements. See safety weight aircraft, 4-3 external slingload, 5-15 load, 4-10, 5-5 rough, 5-1 safe working, 5-9 sling set capacity, 5-12
standard, 5-18 to 5-19 (*illus*)
Whelen light, 6-21
whiteouts, 4-29 (*illus*)
wind, 4-32, 4-33, 6-14
anemometer, 6-19 approach path, 4-34 conditions, 2-5, 4-14 departure path and, 4-7 direction, 1-2, 3-6, 3-10, 5-25, 5-29, 6-32 drift scale, 6-22 erratic, 6-40 limits, 6-7
mean effective, 6-14, 6-22, 6-54
measurement, 6-14, 6-19, 6-25 monitoring of, 6-28
PIBAL. See pilot balloon prevailing, 4-7
shear, 6-40
speed, 3-3 (*illus*) surface, 6-28 (*illus*), 6-54 traffic pattern legs, 3-8 (*illus*)
turbulence, cause of, 3-8, 4-33, 6-45 velocity, 1-2, 3-10
wind streamer vector count, 6-39

## Fm 3-21.38 25 April 2006

By Order of the Secretary of the Army:
PETER J. SCHOOMAKER
General, United States Army Chief of Staff Official:


JOYCE E. MORROW
Administrative Assistant to the
Secretary of the Army
0609401

Official:
Distribution: *Active Army, Army National Guard, and U. S. Army Reserve:* To be distributed IAW IDN 115893 for FM 3-21.38 (110401, AKA quantity requirement block, that is, requirements for FM 3-21.38).