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Date: 20150 516 Revision: 1.0 Revision:1.0

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# DJI Multi

- rotor

Maintenance and Inspection

Rupestrian CyberServices

3644 N. Stone Crest Street

Flagstaff, AZ 86004

(928) 526

- 3625PROPRIETARY INFORMATION

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# Table of Contents

1. Introduction

2. Regular Maintenance

2.1. Post

- flight Cleaning

2.2. Storage

2.3. Pre

- flight/Thru

- flight Visual Inspection

2.4. Corrective Actions



## 3. Full Airframe and Sensor Inspection

3.1. Pre

- flight/Thru

- flight Visual Inspection

3.2. Transformation System

3.3. Aircraft

3.4. Motors

3.5. Propellers



## 4. Corrective Maintenance

5. Funct ional Check Flights

5.1. Requirements

5. 2. Documentation

5.3. Conducting the Flight



## 6. Component Inspection and Replacement RequirementsPROPRIETARY INFORMATION

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# Revision Control Page

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## 1. Introduction:

DJI is headquartered in Shenzhen, widely considered China’s Silicon Valley, this allows them to benefit from direct access to the suppliers, raw materials, and young, creative talent pool necessary for sustained success. Drawing on these resources, they ha ve grown from a single small office in 2006 to a global workforce of over 3,000. DJI offices can now be found in the United States, Germany, the Netherlands, Japan, Beijing and Hong Kong. As a privately owned and operated company, DJI focuses on their visi on, supporting creative, commercial, and nonprofit applications of their technology.

DJI products are redefining industries. Professionals in filmmaking, agriculture, conservation, search and rescue, energy infrastructure, and more trust DJI to bring ne w perspectives to their work and help them accomplish feats safer, faster, and with greater efficiency than ever before.



## 2. Regular Maintenance:

2.1. Post

- flight cleaning After every flight, the operator should use a damp cloth to wipe off dirt from th e aircraft. Be careful never to bring the aircraft into direct contact with water, as this may damage the

electronics within the airframe.

2.2. Storage In order to protect the integrity of the parts, it is recommended to disassemble the DJI UAS as

requ ired before transporting or storing and place the components in a transport case or on a flat surface at room temperature. Avoid exposing the aircraft components to high temperature for prolonged periods of time. In particular, leaving the aircraft exposed to the sun in a hot car

should be avoided.

2.3. Pre

- flight/Thru

- flight Visual Inspection Before and after every flight, the PIC will conduct a visual inspection of the airframe, rotors, motors, gimbals mount, and antennas checking for cracks or other da mage.

Inspect the following components of the aircraft:

2.3.1. Body

- for cracks, deterioration, warping, or other evidence of damage

2.3.2. Motor Cowlings

- for cracks, deterioration, warping, or other evidence of damage

2.3.3. Flight Controls

- for damage and proper servo connections

2.3.4. All Motor Sections

- for damage, foreign objects and proper installation

2.3.5. Propellers

- for cracks, nicks, and secure connection

2.3.6. Camera

- for proper installation, security and evidence of damage

2. 3.7. Radio and Electronic EquipmentPROPRIETARY INFORMATION

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- NOT FOR PUBLIC RELEASE 2.3.8. Batteries

- for charge and proper installation

2.4. Pre

- flight Errors and Corrective Actions The DJI UAS is equipped with a DJI Naza

- M V2 Flight Control System. This provides incredible

ease of use and stabili ty. Pilots can control the UAS’ movements in many directions, including pitch (forward and backwards), roll (left and right), elevator (up and down) and yaw (turn left and right). The flight control system also can provide IOC, Failsafe and battery level warnings.



### Modules Functions

Flight Controller Acts as the brains of the complete flight control system, responsible for

connecting and controlling all the modules together.

IMU Has a built

- in inertial sensor and barometric altimeter that measures both

attitude and altitude GPS and Compass The compass reads geomagnetic information and assists the GPS (Global

Position System) to accurately calculate the position and height of the

aircraft LED Flight Indicators Indicates the status of the flight control system

LED flight indicators are found at the front and the rear of the phantom. Front LEDs are for indicating where the nose of the aircraft is and light up solid red after the motors have started spinning. Rear LED Flight Indicators light up to show the aircraft’s current flight status once the flight battery is powered on. The Hexi

- copter and octi

- copter DJI products have LEDs to indicate motor status as opposed to aircraft position. For details, see below table:

Rear LED Flight Indicator s Normal Notes
R G Y... Red, Green, Yellow,

flashing in turn Power on Self

- test

Y G... Yellow, Green, flashing in turn Warming up Aircraft cannot take off

G...Slow Green flashing Ready to fly More than 6 GPS satellites

are found Y...Slow Yellow flashing Ready to fly (non

- GPS) Less than 6 GPS satellites are

found

Rear LED Flight Indicators Abnormal Notes Y...Quick Yellow flashing Remote controller signal lost Refer to Failsafe Function R...Slow Red flashing Low Battery level warning DJI App will also show warning R...Quick Red flashing Critical Low Battery level DJI App will also show warning R...Three Red flashing off and

on Not Stationary or Sensor Bias is too big Keep aircraft stationary or perform IMU calibration

R...Solid Red Error Cannot Fly R Y...Red, Yellow flashing in

turn Compass needs calibration Calibrate the compassPROPRIETARY INFORMATION

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## 3. Full Airframe and Avionics Inspection

Beyond the general airframe inspection that is performed before every flight, Rupestrian CyberServices recommends that the operator perform a full airframe and sensor inspection regularly (every 10 hours) to keep the DJI UAS in good operating condition. The inspection includes 4 steps:

3.1. Preflight Visual Inspection Perform a thorough Preflight Visual Inspection as described in this manual.

3.2. Check the transformation system A servo failure may completely prevent suitable flight control. It is therefore important to check them properly. To check the system, follow these steps:

3.2.1 . Check the servomotor cables for wear. Also confirm that the connection points are still in good condition.

3.2.2. Check the lead screws and contact DJI Support to arrange repairs if any bending or damage is discovered. Clean the lead screws with WD

- 40 s pray if they show signs of rust.

3.2.3. Listen to the servomotors during the transformation, if there is abnormal noise, it may

indicate that the servomotors worn.

3.2.4. After the landing gear rises, check the lead screws and bearings. If any dirt or du st is found, clean and grease the bearings.

3.2.5. Check the lead screws. If there is any scratches, dents, or plastic particles underneath them, contact DJI Support to arrange repairs.

3.3. Check the aircraft The DJI UAS is a simple airframe but small damage can significantly inhibit efficient flight operations. To check the aircraft follow these steps:

3.3.1. Confirm that all the screws are still adequately tightened.

3.3.2. Check the aircraft for breaks or damage. If there is any reason to believe that detectable damage might affect flight safety, consult with DJI Support.

3.3.3. Check the carbon tubes of the arms for damage.

3.3.4. Check the dampers on the landing gears. If they are loose, secure them with 502 glue.

3.3.5. Ensure that there are no obstacles on or around the GPS module or around the antennas on the landing gear. Remove any obstacles (such as tapes with conductive material) that might affect or block the signal.PROPRIETARY INFORMATION

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- NOT FOR PUBLIC RELEASE 3.3.6. Check that the right and left landing gear rest at the same ti lt angle.

3.4. Check the motors. The motors are essential for operation and must be operating properly at all times. To check it, follow these steps:

3.4.1. Check the rotors to confirm that they have not become loose.

3.4.2 Detach the propellers and st art the motors. Listen carefully. If there is any abnormal noise, please replace the motors. This may be a sign that the bearings have been worn out.

3.4.3. Detach the propellers and start the motors. Carefully examine the edge of the rotor and

confirm th at the shaft is perfectly centered on the motor. Check for any abnormal or excessive vibration. If any problems are detected, contact DJI Support to order replacement motors.

3.4.4. Check for deformities by confirming that the gap between the motor and motor base is even. If not contact DJI Support to order replacement motors.

3.4.5. Ensure that the screws used to secure the motor base are tight and the plastic components around the motors are in good condition. If not please tighten the screws and

cont act DJI to repair any broken plastic components.

3.5. Propellers The air speed sensor is connected to the Pitot probe by a pair of tubes. To check it, follow these
steps:

3.5.1. Check the propellers. If there is any bending, breakage or cracking on a p ropeller, do not

use it.

3.5.2. Attach the propeller to the motor, turn on the aircraft, and place it on the ground. Stand 1 meter away from the aircraft and observe the rotating propellers. If you can see two distinct propeller outline layers, when looki ng at a spinning propeller from the side, this propeller is damaged and should not be used..



## 4. Corrective maintenance

4.1. Small repairs of cracks in the airframe can be done using foam glue such as UHU POR. If you have doubts about the extent of the damage, consider replacing the entire component.

4.2. If you detect cracks in the propeller, change it by referring to Propeller in chapter 2 of the

user manual.



## 5. Functional Check Flights

5.1. Requirements. A Functional Check Flight (FCF) determines whether an aircraft airframe, motor, or equipment is functioning according to established standards while the aircraft operatesPROPRIETARY INFORMATION

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- NOT FOR PUBLIC RELEASE in its intended environment. An FCF is required when the aircraft has undergone maintenance or alterations that affect its operation or flight characteristics. The flight is performed when it is not possible to determine proper operation by a ground check. Some of the situations that require an FCF include the following:

5.1.1. A f irst flight of an aircraft after purchase

5.1.2. After the installation or reinstallation of a motor or autopilot

5.1.3. When a control surface has been installed, reinstalled, or re

- rigged

5.1.4. When the barometric altimeter has been installed or rei nstalled

5.1.5. After repairing a crack longer than 2 cm

5.2. Documentation. The requirement for a check flight will be documented as a "Discrepancy" writeup in the aircraft logbook. The writeup should contain a listing of pertinent

items or aircraf t systems to be observed during the check flight and for the disposition of telemetry recorded during the flight. A "Corrective Action" writeup will indicate satisfactory or unsatisfactory performance of all listed items or systems. Finally, the writeup s hould contain recommendations about the flight and the aircraft's return to service.

Example maintenance logbook entries:

DISCREPANCY: Functional Check Flight Required. (Description of major maintenance performed.) Discovered by: (PIC Name and ####)

CORRECTIVE ACTION: Functional Check Flight Accomplished: All systems check OK. Corrected by: (PIC that accomplished the flight and ####.)

CORRECTIVE ACTION: Functional Check Flight Accomplished: (Describe discrepancies). Additional maintenance required. Corrected by: (PIC that accomplished the flight and ####.)

5.3. Conducting the Flight. Functional Check Flights should begin with a thorough understanding of the maintenance the occurred prior to flight and the potential effects on aircraft
systems.

5.3.1. Prior to flight conduct a Full Airframe and Avionics Inspection IAW paragraph 3 as well asPROPRIETARY INFORMATION

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5.3.2. The aircraft should remain within 1/4 mile of the launch location and avoid the overflight of persons, property, and vehicles on the ground. The missio n should terminate with a normal descent to landing.

5.3.4. Note any discrepancies or anomalies in aircraft performance and save the telemetry file for future analysis and reference. Document the flight in the aircraft logbook with remarks and

recomme ndations IAW the above paragraph.PROPRIETARY INFORMATION

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## 6. Component Inspection and Replacement Requirements

COMPONENT OR

INSPECTION INSPECTION

INTERVAL REPLACEMENT

INTERVAL MAINTENANCE

LEVEL REQUIRED

SERVOS PR 1 FAULT MANUFACTURER

MOTOR PR FAULT MANUFACTURER

PROPELLER PR/TH 2 AS NEEDED PIC 6

ELECTRONIC SPEED

CONTROL PR FAULT MANUFACTURER

BATTERIES PR FAULT PIC

REMOTE COMMAND &

CONTROL

TRANSMITTER PR FAULT PIC

GROUND CONTROL

STATION PR WHEN UNABLE TO

CONNECT PIC

GCS SOFTWARE

UPDATE CHECK FOR UPDATES

WEEKLY (7 DAYS) WHEN PUBLISHED PIC

AIRCRAFT SOFTWARE

UPDATE CHECK FOR UPDATES

WEEKLY (7 DAYS) WHEN PUBLISHED PIC

SAFETY BULLETIN

CHECK CHECK FOR UPDATES

WEEKLY (7 DAYS) WHEN PUBLISHED AS DIRECTED

AIRWORTHINESS

DIRECTIVE CHECK FOR UPDATES
WEEKLY (7 DAYS) WHEN PUBLISHED AS DIRECTED

PR/TH 2 BEFORE FLIGHT N/A PIC

BPO 3 AFTER LAST FLIGHT

OF THE DAY N/A PIC

FULL AIRFRAME AND

SENSOR INSPECTION 4 EVERY 10 HOURS

OF FLIGHT N/A PIC

FCF 5 AFTER MAJOR

MAINTENANCE N/A PIC

1. PR: Preflight performed by the Pilot in Command. See paragraph 2.4.1 for tests conducted. 2. PR/TH: Preflight/Thru

- flight. See paragraph 2.3 for inspection requirements. 3. BPO: Basic postflight visual inspection conducted IAW paragraph 2.3 after the last flight of t he day. 4. Full Airframe and Avionics Inspection conducted IAW paragraphs 3.1 through 3.4 of this manual 5. FCF: Functional Check Flight performed after the aircraft has undergone maintenance or alterations that affect the operation or flight characteristi cs, such as the replacement of a flight critical component. Requirements and procedures defined in paragraph 5 of this manual. 6. PIC: Maintenance performed by Pilot in Command