+-------------+-----------------+------------+-----+-----------------+
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+-------------+-----------------+------------+-----+-----------------+
| **U.S.      |                 |            |     |                 |
| D           |                 |            |     |                 |
| epartment** |                 |            |     |                 |
|             |                 |            |     |                 |
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| Trans       |                 |            |     |                 |
| portation** |                 |            |     |                 |
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+-------------+-----------------+------------+-----+-----------------+
| *           |                 | **Date:**  |     | **AC No.:**     |
| *Subject:** |                 | 06/27/07   |     | 150/5345-55A    |
| SP          |                 |            |     |                 |
| ECIFICATION |                 | *          |     | **Change:**     |
| FOR L-893,  |                 | *Initiated |     |                 |
| LIGHTED     |                 | by:**      |     |                 |
| VISUAL AID  |                 | AAS-100    |     |                 |
| TO INDICATE |                 |            |     |                 |
| TEMPORARY   |                 |            |     |                 |
| RUNWAY      |                 |            |     |                 |
| CLOSURE     |                 |            |     |                 |
+-------------+-----------------+------------+-----+-----------------+

1.  **PURPOSE.** This advisory circular (AC) provides guidance in the
    design of a lighted visual aid to indicate temporary runway closure.

2.  **EFFECTIVE DATE.** Effective 6 months after the date of this
    circular, only that equipment qualified per this specification will
    be listed in AC 150/5345-53, *Airport Lighting Equipment
    Certification Program.*

3.  **CANCELLATION.** AC 150/5345-55, *Lighted Visual Aid to Indicative
    Temporary Runway Closure,* dated 07/14/03, is cancelled.

4.  **APPLICATION.** The standards contained herein are recommended by
    the FAA in all applications involving airport development of this
    nature. The use of these standards is mandatory for airport projects
    receiving Federal funds under the airport grant assistance program
    and those using funds under the passenger facility charge (PFC)
    program.

5.  **BACKGROUND.** There have been instances of aircraft landing on
    runways that are temporarily closed for maintenance or snow removal
    operations. The likelihood of unintended landings increases during
    periods of reduced visibility and at night whenever runway lighting
    must be on for electrical maintenance or snow removal. The lighted
    visual aid is intended to eliminate ambiguity concerning the status
    of the runway and to reduce instances of aircraft landing on
    temporarily closed runways. This AC is based on FAA Technical Center
    report number DOT/FAA/CT-TN87/3. See Chapter 2 for information on
    how to obtain the report.

6.  **PRINCIPAL CHANGES.**

    a.  Added photometric requirements and testing.

    b.  Deleted 150W/120V type lamp.

    c.  All applicable documents and document sources have been updated.

7.  **METRIC UNITS.** To promote an orderly transition to metric units,
    this AC contains both English and metric dimensions. The metric
    conversions may not be exact metric equivalents and, until there is
    an official changeover to the metric system, the English dimensions
    will govern.

8.  **COMMENTS OR SUGGESTIONS** for improvements to this AC should be
    sent to:

> Manager, Airport Engineering Division
>
> Federal Aviation Administration
>
> ATTN: AAS-100
>
> 800 Independence Avenue, S.W.
>
> Washington DC 20591

9.  **COPIES OF THIS AC.** The Office of Airport Safety and Standards
    makes this AC available online at www.faa.gov.

![](media/image2.png){width="2.3680555555555554in"
height="0.5493055555555556in"}

David L. Bennett

Director of Airport Safety and Standards

# CHAPTER 1. SCOPE AND CLASSIFICATION.

## 1.1 Scope. 

This specification sets forth the Federal Aviation Administration (FAA)
requirements for a lighted visual aid to indicate temporary runway
closure. This AC does not discuss the use of a lighted visual aid to
indicate runway closure. The use and application of a lighted visual aid
for runway closure is the subject of AC 150/5340-1, *Standards for
Airport Markings,* and AC 150/5370-2, *Operational Safety on Airports
During Construction.*

## 1.2 Classification.

The lighted visual aid equipment covered in this AC is classified as
L-893.

**Intentionally left blank.**

# CHAPTER 2. REFERENCED DOCUMENTS.

## 2.1 General.

The following is a listing of documents referenced in this AC.

### 2.2 FAA Advisory Circulars (ACs) and Technical Report.

> AC 150/5345-53 *Airport Lighting Equipment Certification Program.*
>
> AC 150/5340-1 *Standards for Airport Markings.*
>
> AC 150/5370-2 *Operational Safety on Airports During Construction.*
>
> DOT/FAA/CT-TN87/3 *Development of a Visual Aid to Indicate Temporary
> Runway Closure.*

## 2.3 Federal Standards.

FED-STD-595 *Colors Used in Government Procurement*

4.  **Society of Automotive Engineers (SAE) Aerospace Standards.**

> SAE-AS25050 *Colors, Aeronautical Lights and Lighting Equipment,
> General Requirement For,*

**2.5 Document Sources.**

FAA ACs may be obtained from:

> U.S. Department of Transportation
>
> Subsequent Distribution Office
>
> Ardmore East Business Center
>
> 3341 Q 75^th^ Ave.
>
> Landover, MD 20785
>
> Telephone: (301) 322-4961
>
> FAX: (301) 386-5394
>
> Website:
> www.faa.gov/airports_airtraffic/airports/resources/advisory_circulars/

[]{.mark}

FAA Technical Reports may be obtained from:

William J. Hughes Technical Center,

Information Services Management Branch

Atlantic City International Airport, NJ. 08405

Telephone: (609) 485-5000

Website: http://www.airtech.tc.faa.gov/safety/downloads/

Federal Standards may be obtained from:

Federal Supply Services

Specification Section

470 L\'Enfant Plaza East

SW Suite 8100

Washington, DC 20407

Telephone: (202) 619-8925

FAX: (202) 619-8985

Website: [www.dsp.dla.mil](http://www.dsp.dla.mil/)

SAE standards may be obtained from:

SAE World Headquarters

400 Commonwealth Drive

Warrendale, PA 15096-0001

Telephone : (724) 776-4841

Fax : (248) 273-2494

Website : www.sae.org

# CHAPTER 3. EQUIPMENT REQUIREMENTS.

1.  **GENERAL.**

This Chapter addresses the environmental, design, and photometric
requirements for an L-893, Lighted Visual Aid.

2.  **ENVIRONMENTAL REQUIREMENTS.**

The L-893 must be designed to operate in the following conditions:

a\. Temperature. Operating: -40 degrees F (-40 degrees C) to 130 degrees
F (55 degrees C).

**NOTE:** The portable power supply (see paragraph 3.3c) is exempt from
the low temperature requirement.

b\. Humidity. 95 percent relative humidity.

> c\. Wind. Withstand a minimum wind speed of at least 40 mph (64.40
> km/h) without adversely affecting the aiming or operation.
>
> d\. Sunshine. Exposure to solar radiation.

3.  **PERFORMANCE STANDARDS**.

The L-893 must:

a.  Be a portable unit that can be quickly towed to and from the runway.

b.  Consist of light sources that transmit an aviation white color per
    SAE-AS25050. The light sources must be arranged in the shape of a
    letter \"X\" with arms crossed at an appropriate angle to make the
    "X" readily discernible (see Figure 2). The arms must be painted
    yellow on all sides so that the unit will be clearly visible when it
    is in position. The color must be No. 13538, aviation yellow, per
    FED-STD-595.

c.  Be energized by a portable power supply capable of a minimum of 24
    hours continuous operation. The light unit must also accept 120
    volts alternating current external power when available on the
    airfield.

d.  Simultaneously flash all light sources mounted on the X at a rate of
    2.5 seconds on ( 20%) and 2.5 seconds off (20%).

e.  Be able to switch between day and night intensities per paragraph
    3.3f.

f.  Provide a minimum day effective intensity of 70,000 candela (cd) at
    the beam center, 34,000 cd at 10 degrees radius, 13,000 cd at 15
    degrees radius per Figure 1. The minimum night effective intensity
    must be 2,000 cd at beam center, 970 cd at 10 degrees radius, and
    370 cd at 15 degrees radius per Figure 1.

> NOTE: The minimum intensity for each light source is determined by
> dividing the specified minimum intensity by the number of light
> sources.

**Figure 1. Beam Pattern**

g.  Provide fail-safe protection to ensure that the unit stays on as
    continuous light if the flasher unit fails.

h.  Include an operations placard placed in a conspicuous location that
    instructs operators to visually check the operation of the device
    every 2 hours.

i.  Provide means for adjusting and leveling to allow tilting to an
    optimum angle of 5 degrees from vertical.

j.  Provide a minimum lighting arrangement with at least 9 light sources
    equally spaced per Figure 2.

> **Figure 2. Lighted X Dimensions**

k.  Be set up by one person in less than 5 minutes.

## MATERIALS AND FINISH.

All components must be suitable for the intended purpose and adequately
protected against corrosion. The components must have adequate capacity
and must not be operated in excess of the component manufacturer's
recommended rating. All surfaces of the assembly must be smooth without
burrs or sharp edges.

# CHAPTER 4. EQUIPMENT QUALIFICATION REQUIREMENTS.

## **4.1 Qualification Procedures.** 

Procedures for qualifying equipment to be furnished under the Federal
grant assistance program for airports are contained in AC 150/5345-53,
*Airport Lighting Equipment Certification Program*. Qualification tests
must be conducted on the equipment to ensure the requirements and
performance standards are met.

## 4.2 Visual Examination Test. 

Conduct a visual examination to ensure the equipment complies with the
requirements in this AC for size, paint color, materials, finish and
quality of workmanship.

3.  **Photometric Tests.**

A photometric test for the light source color (per paragraph 3.3b),
intensity and beam pattern requirements (per paragraph 3.3f) must be
conducted.

a.  The light source (lamps) must be tested at 3 percent of their
    nominal operating voltage.

b.  Beam coverage is given for the extremities of a circle per Figure 1.

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4.  **Operational Tests.**

Verify that all operations requirements conform to this AC.

a\. Energize the unit.

b\. Verify that all lights are lit.

> c\. Verify that the lights flash per paragraph 3.3d.
>
> d\. Verify that the capability for switching between day and night use
> is operational per paragraph 3.3e.

e\. Verify that the fail-safe mode (per paragraph 3.3g) is operational
by defeating the flasher.

5.  **Wind Load Test.**

Evidence must be provided, either by testing or by calculation of
mechanical force, to demonstrate that the equipment can withstand wind
velocities per paragraph 3.2c.

6.  **High Temperature Test.**

The high temperature test must be conducted per MIL-STD-810F, Method
501.4 Procedure II.

> a\. The high temperature test must be conducted per MIL-STD-810F,
> Method 501.4, Procedure II. The equipment must be subjected to a
> constant temperature of +130 degrees F (+55 degrees C) for 4 hours
> after equipment temperature stabilization and be operated throughout
> the test. The equipment must operate at the specified flash rate
> (paragraph 3.3d) and intensity (paragraph 3.3f).
>
> b\. A visual examination must be conducted after the equipment is
> removed from the chamber. Failure of the equipment to operate as
> specified is cause for rejection.

7.  **Low Temperature Test.**

The low temperature test must be conducted per MIL-STD-810F, Method
502.4 Procedure II.

**NOTE:** The portable power supply is exempt from this requirement.

a\. Equipment operation must be demonstrated at the beginning of the
test per paragraph 4.4.

> b\. The equipment, with input power off, must then be exposed to a
> 24-hour soaking period at -40 degrees F (-40 degrees C) after which
> the equipment must be turned on for one hour, and must achieve
> specified flash rate (paragraph 3.3d) and intensity (paragraph 3.3f)
> within 1 minute after being energized.

#  

**Intentionally left blank.**

# CHAPTER 5. PRODUCTION TEST REQUIREMENTS.

## 5.1 Production Tests.

A visual examination must be performed per paragraph 4.2.

a\. Perform an operational test on each production unit per paragraph
4.4a through 4.4e.

## 5.2 Production Test Records.

The manufacturer must maintain records showing actual test results of
all the tests required by paragraph 5.1 for a period of three years.

**Intentionally left blank.**