2C. +25kg / Spraying Aircraft and Systems

Information

DJI Agras T25

DJI Agras T50

Design & Manufacturer Details

DJI Headquarters

14^th Floor, West Wing

Skyworth Semiconductor Design Building

No.18 Gaoxin South 4^th Avenue

Nanshan District

Shenzhen

China

518057

DJI Headquarters

14^th Floor, West Wing

Skyworth Semiconductor Design Building

No.18 Gaoxin South 4^th Avenue

Nanshan District

Shenzhen

China

518057

Recognised Standards

DJI Agras T25 holds an ‘EU DECLARATION OF CONFORMITY’. Details can be found here: EU Declaration of Conformity - DJI

DJI Agras T50 holds an ‘EU DECLARATION OF CONFORMITY’. Details can be found here: EU Declaration of Conformity - DJI

Information

DJI Agras T25

DJI Agras T50

Aircraft Flight Duration / Endurance

No payload for spraying: 14.5 min (take-off weight of 32 kg with a 15.5Ah battery)

Fully loaded for spraying: 7 min (take-off weight of 52 kg with a 15.5Ah battery)

No payload for spreading: 14.5 min (take-off weight of 32 kg with a 15.5Ah battery)

Fully loaded for spreading: 6 min (take-off weight of 58 kg with a 15.5Ah battery)

No payload for spraying: 16.5 min (take-off weight of 52 kg with a 30Ah battery)

Fully loaded for spraying: 7 min (take-off weight of 92 kg with a 30Ah battery)

No payload for spreading: 14.5 min (take-off weight of 32 kg with a 15.5Ah battery)

Fully loaded for spreading: 5.5 min (take-off weight of 103 kg with a 30Ah battery)

Maximum Radio Range of C2 Link

4km (CE)

4km (CE)

Maximum Theoretical Service Ceiling

4500 m / 14,793 ft

4500 m / 14,793 ft

Maximum Horizontal Flight Speed

19 Knots / 10 Meter Per Second 

19 Knots / 10 Meter Per Second 

Minimum Airspeed

N/A – Multi-rotor

N/A – Multi-rotor

Glide Distances

N/A – Multi-rotor

N/A – Multi-rotor

Maximum Ascent Speed

5.8 Knots / 3 Meter Per Second 

5.8 Knots / 3 Meter Per Second 

Maximum Descent Speed

5.8 Knots / 3 Meter Per Second 

5.8 Knots / 3 Meter Per Second 

Precipitation

IP55

IP55

Max Wind Speed

6 m/s

6 m/s

Minimum Temperature

0°C

0°C

Maximum

Temperature

45°C

45°C

Effects of Differing Payloads on the Flight Envelope

N/A

N/A

Information

DJI Agras T25

DJI Agras T50

Aircraft Type

Multirotor – Quadcopter

Multirotor – Quadcopter X

Overall Dimensions

Flight Dimensions

2585×2675×780 mm (arms and propellers unfolded)

Flight Dimensions

2800×3085×820 mm (arms and propellers unfolded)

Mass with and without fuel

25.4 kg (excl. battery) 

32 kg (inc. battery)

Max take-off weight for spraying: 52 kg (at sea level)

Max take-off weight for spreading: 58 kg (at sea level)

39.9 kg (excl. battery) 

52 kg (inc. battery)

Max take-off weight for spraying: 92 kg (at sea level)

Max take-off weight for spreading: 103 kg (at sea level)

Maximum Payload that can be carried

25kg (Liquid / Solids carried by aircraft for spraying/spreading)

50kg (Liquid / Solids carried by aircraft for spraying/spreading)

Information

DJI Agras T25

DJI Agras T50

Method of Construction

Commercial off the Shelf system

Commercial off the Shelf system

Materials Used 

Stainless Steel, Aluminium & Plastic

Stainless Steel, Aluminium & Plastic

Frangibility of the Aircraft Structure

The Aircraft is non-frangible. Areas of impact damage resulting in the aircraft becoming unairworthy would-be propellers, rotor arms and motors. Following any impact with the ground, the system will be repaired in conjunction with section 1.4.2B and test flown before re-entry to service. 

The Aircraft is non-frangible. Areas of impact damage resulting in the aircraft becoming unairworthy would-be propellers, rotor arms and motors. Following any impact with the ground, the system will be repaired in conjunction with section 1.4.2B and test flown before re-entry to service. 

Information

DJI Agras T25

DJI Agras T50

Number of Batteries

1

1

Type of Batteries

Li-ion

Li-ion

Battery Diagram

Battery Mass

6.6kg

12.1kg

Battery Design

Battery Output Power

809 Wh

1567 Wh

Battery Voltage

52.22V - 

52.22V - 

Storage

If the Battery is not expected to be used for 10 days or more, it will be discharged to a 40%-65% state of charge and stored in a cool dry place with temperatures between 22°C and 28°C, avoiding direct sunlight and heat sources.

Complete charging and discharging of the battery to be completed every three months.

If the Battery is not expected to be used for 10 days or more, it will be discharged to a 40%-65% state of charge and stored in a cool dry place with temperatures between 22°C and 28°C, avoiding direct sunlight and heat sources.

Complete charging and discharging of the battery to be completed every three months.

Information

DJI Agras T25

DJI Agras T50

Propulsion System 

4 x DJI Agras T10 Motors

8x DJI Agras T20 Motors

Voltage

15V

15V

Number of Motors

4

8

Number of Propellers

4

8

Propeller Construction Material

Plastic

Plastic

Information

DJI Agras T25

DJI Agras T50

Fuel Type 

Battery - Electrical

Battery - Electrical

Fuel Delivery

Electrical Circuitry

Electrical Circuitry

Information

DJI Agras T25

DJI Agras T50

Flight Control

Flight is controlled through electrical signals from the Flight Controller. The flight controller instructs the ESC (Electric Speed Controller) to vary speeds, which controls the speeds of the electrical motors and thus the propellers to complete flight manoeuvres. Control surfaces within the UA are fixed pitch propellers. 

Flight is controlled through electrical signals from the Flight Controller. The flight controller instructs the ESC (Electric Speed Controller) to vary speeds, which controls the speeds of the electrical motors and thus the propellers to complete flight manoeuvres. Control surfaces within the UA are fixed pitch propellers. 

Stabilisation

Aircraft stabilisation is completed automatically. The IMU consists of an accelerometer and a gyroscope, which provide the flight controller with information such as angular rate and orientation. The aircraft is then in turn stabilised by the flight controller varying speeds of the ESC, which in turn vary the speeds of the electrical motors. 

Aircraft stabilisation is completed automatically. The IMU consists of an accelerometer and a gyroscope, which provide the flight controller with information such as angular rate and orientation. The aircraft is then in turn stabilised by the flight controller varying speeds of the ESC, which in turn vary the speeds of the electrical motors. 

Automatic Take-Off and Landing

GPS enabled Automatic take-off and landing activated via the interface 

GPS enabled Automatic take-off and landing activated via the interface 

Automatic Return-to-Home

Equipped with automatic return to home function activated by either the Command Unit or via the interface on the DJI Pilot App.

GPS-enabled Return to Home will activate under the circumstances detailed in section 1.3.10C

Equipped with automatic return to home function activated by either the Command Unit or via the interface on the DJI Pilot App.

GPS-enabled Return to Home will activate under the circumstances detailed in section 1.3.10C

Information

DJI Agras T25

DJI Agras T50

Sensor Details

1x DJI Proprietary Flight Controller

1x GPS Unit

1x Compass Unit

1x IMU (Inertia Management Unit)

2x Active Phased Array Omnidirectional Radar

1x Binocular Vision System

1x DJI Proprietary Flight Controller

1x GPS Unit

1x Compass Unit

1x IMU (Inertia Management Unit)

2x Active Phased Array Omnidirectional Radar

1x Binocular Vision System

Radar Systems 

Phased Array Radar System

Model RD241608RF (forward phased array radar)

RD241608RB (rear phased array radar)

Terrain Follow

Max slope in Mountain mode: 20°

Altitude detection range: 1-50 m

Stabilization working range: 1.5-30 m.

Obstacle Avoidance: Obstacle sensing range (omnidirectional): 1-50 m

FOV:

Forward phased array radar: horizontal 360°, vertical ±45°, upward ±45° (cone)

Rear phased array radar: vertical 360°, horizontal ±45°

Working conditions: flying higher than 1.5 m over the obstacle at a horizontal speed no more than 10 m/s and vertical speed no more than 3 m/s.

Safety limit distance: 2.5 m (distance between the front of propellers and the obstacle after braking).

Sensing direction: 360° omnidirectional sensing.

Binocular Vision System

Measurement range 0.5-29 m

Effective Sensing Speed

≤10 m/s.

FOV

Horizontal: 90°, Vertical: 106°

Operating Environment

Adequate light and discernible surroundings

Phased Array Radar System

Model RD241608RF (forward phased array radar)

RD241608RB (rear phased array radar)

Terrain Follow

Max slope in Mountain mode: 20°

Altitude detection range: 1-50 m

Stabilization working range: 1.5-30 m.

Obstacle Avoidance: Obstacle sensing range (omnidirectional): 1-50 m

FOV:

Forward phased array radar: horizontal 360°, vertical ±45°, upward ±45° (cone)

Rear phased array radar: vertical 360°, horizontal ±45°

Working conditions: flying higher than 1.5 m over the obstacle at a horizontal speed no more than 10 m/s and vertical speed no more than 3 m/s.

Safety limit distance: 2.5 m (distance between the front of propellers and the obstacle after braking).

Sensing direction: 360° omnidirectional sensing.

Binocular Vision System

Measurement range 0.5-29 m

Effective Sensing Speed

≤10 m/s.

FOV

Horizontal: 90°, Vertical: 106°

Operating Environment

Adequate light and discernible surroundings

Satellite System

GPS+Galileo+BeiDou

GPS+Galileo+BeiDou

Interface

Telemetry details from all sensors and satellite systems can be viewed in the DJI Agras App. Any errors present within the sensors will be flagged up to the pilot, and in some cases (such as an IMU or Compass Error), the UA will prevent the pilot from taking off. 

DJI Agras App will also notify the Pilot if a minimum level of satellites has not been obtained before deployment, which would result in the UA launching in ‘Atti mode’, where GPS assistance is not available.

Telemetry details from all sensors and satellite systems can be viewed in the DJI Agras App. Any errors present within the sensors will be flagged up to the pilot, and in some cases (such as an IMU or Compass Error), the UA will prevent the pilot from taking off. 

DJI Agras App will also notify the Pilot if a minimum level of satellites has not been obtained before deployment, which would result in the UA launching in ‘Atti mode’, where GPS assistance is not available.

Automatic Flight Control

Primary control of the DJI Agras models is complete through an automated flight control program. This is either through DJI Terra or the in-built DJI Agras application within the Remote Control. The RP is always able to intervene with flight control if required.

Primary control of the DJI Agras models is complete through an automated flight control program. This is either through DJI Terra or the in-built DJI Agras application within the Remote Control. The RP is always able to intervene with flight control if required.

Information

Aircraft Detailed within text

ADS-B Receive

This consists of an ADS-B Receive-only system that will detect aircraft that are equipped with an ADS-B Facility. 

This system allows the Remote Pilot to detect aircraft that are equipped and using ADS-B. When AirSense receives an ADS-B signal, the RP is alerted to this via the interface. DJI AirSense provides progressive warnings, together with the live GPS position of the aircraft, present on the DJI Pilot Map. 

The first (or "lowest") level warning occurs when the manned aircraft is detected. All detected aircraft will be displayed in the app (up to 10 aircraft at a time). Please pay attention to ensure flight safety. 

The second (or “middle”) level warning occurs two kilometres away from the manned aircraft. Please pay attention to avoid any hazards. 

The third (or “highest”) level warning occurs one kilometre away from the manned aircraft. Please avoid the manned aircraft immediately. 

Below is a diagram of the warnings displayed to the remote pilot, within the top bar of the DJI Pilot screen. 

Electronic Conspicuity (EC)

The system is not present within the aircraft covered within volume 1B 

Information

DJI Agras T25

DJI Agras T50

Take Off and Landing Aids

Landing skids are located along the length of the Port and Starboard side of the DJI Agras T25 to assist with landing and take-off.

Landing skids are located along the length of the Port and Starboard side of the DJI Agras T25 to assist with landing and take-off.

Information

DJI Agras T25

DJI Agras T50

Payload Summary Details 

The DJI Agras T25 has an integrated 20-litre tank that can be filled with liquids that can be sprayed via the arm nozzles. The T25 spreading system allows for 35L of solids, such as granules and seeds, to be dispensed via the spraying system.

The DJI Agras T50 has an integrated 40-litre tank that can be filled with liquids that can be sprayed via the arm nozzles. The T50 spreading system allows for 75L of solids, such as granules and seeds, to be dispensed via the spraying system.

Mass

The maximum mass that can be carried in the liquid tank is 20 kilos or 25 kg in the spreading tank. 

The maximum mass that can be carried in the liquid tank is 40 kilos or 50 kg in the spreading tank.

Spray Nozzle Diagram

Spray payload

Agricultural liquids will be sprayed. Upon the granting of an application certificate by the HSE, this will include regulated liquids such as chemical pesticides.

Agricultural liquids will be sprayed. Upon the granting of an application certificate by the HSE, this will include regulated liquids such as chemical pesticides.

Spreading system

T25 Spraying System.

Spray Tank Volume 20 L

Operating Payload 20 kg

Effective Spray Width (at a height of 3 m above the crops)4-7 m

Max Flow Rate16 L/min (2 sprinklers)

24 L/min (4 sprinklers)

Sprinkler Model LX8060SZ

Sprinker Quantity 2

Droplet Size 50-500 μm

Pump Type Magnetic drive impeller pump.

Optional payload of 35L Spread Tank 

T50 Spraying System 

Spray Tank Volume 40 L 

Operating Payload 40 kg 

Effective Spray Width (at a height of 3 m above the crops)4-11 m 

Max Flow Rate16 L/min (2 sprinklers)

24 L/min (4 sprinklers)

Sprinkler Model LX8060SZ

Sprinker Quantity 2

Droplet Size 50-500 μm

Pump Type Magnetic drive impeller pump.

Optional payload of 75L Spread Tank 

Spreading Payload

Agricultural solids will be spread. Upon the granting of an application certificate by the HSE, this will include regulated solids such as chemical pesticides.

Agricultural solids will be spread. Upon the granting of an application certificate by the HSE, this will include regulated solids such as chemical pesticides.

Information

DJI Agras T25

DJI Agras T50

Return to Home Features

There are three types of RTH: Smart RTH, Low Battery RTH, and Failsafe RTH.

Smart RTH

Press and hold the RTH button on the remote controller when GNSS is available to enable Smart RTH. Both Smart and Failsafe RTH use the same procedure. With Smart RTH, you may control the altitude of the aircraft to avoid collisions when returning to the home point. Press the RTH button once or push the pitch stick to exit Smart RTH and regain control of the aircraft.

Low Battery RTH

Low Battery RTH is only available in Route and Fruit Tree operations. If the Low Battery Action is set to RTH in the Aircraft Battery settings in the app, the aircraft will pause the operation and enter RTH automatically when the aircraft battery level reaches the low battery threshold.

During RTH, users can control the altitude of the aircraft to avoid collisions when returning to the home point. Press the RTH button once or push the pitch stick to exit RTH and regain control of the aircraft.

The aircraft will not enter RTH if the Low Battery Action is set to Warning in the Aircraft Battery settings in the app.

Failsafe RTH

Failsafe RTH is automatically activated if the remote controller signal is lost for more than three seconds, provided that the home point has been successfully recorded, the GNSS signal is strong (when the GNSS icon is green), and the RTK module is able to measure the heading of the aircraft. The RTH continues if the remote controller signal is recovered, and users can control

the aircraft using the remote controller. Press the RTH button once to cancel RTH and regain control of the aircraft

There are three types of RTH: Smart RTH, Low Battery RTH, and Failsafe RTH.

Smart RTH

Press and hold the RTH button on the remote controller when GNSS is available to enable Smart RTH. Both Smart and Failsafe RTH use the same procedure. With Smart RTH, you may control the altitude of the aircraft to avoid collisions when returning to the home point. Press the RTH button once or push the pitch stick to exit Smart RTH and regain control of the aircraft.

Low Battery RTH

Low Battery RTH is only available in Route and Fruit Tree operations. If the Low Battery Action is set to RTH in the Aircraft Battery settings in the app, the aircraft will pause the operation and enter RTH automatically when the aircraft battery level reaches the low battery threshold.

During RTH, users can control the altitude of the aircraft to avoid collisions when returning to the home point. Press the RTH button once or push the pitch stick to exit RTH and regain control of the aircraft.

The aircraft will not enter RTH if the Low Battery Action is set to Warning in the Aircraft Battery settings in the app.

Failsafe RTH

Failsafe RTH is automatically activated if the remote controller signal is lost for more than three seconds, provided that the home point has been successfully recorded, the GNSS signal is strong (when the GNSS icon is green), and the RTK module is able to measure the heading of the aircraft. The RTH continues if the remote controller signal is recovered, and users can control

the aircraft using the remote controller. Press the RTH button once to cancel RTH and regain control of the aircraft

Vision Position System & Infrared System

During RTH procedures, radar within the aircraft ensures that the aircraft does not collide with objects.

During RTH procedures, radar within the aircraft ensures that the aircraft does not collide with objects.

Geofencing

DJI Flysafe Database is pre-installed within the aircraft and the Command Unit. This prevents the UA from flying in high-risk areas and prevents the aircraft from breaching altitude restrictions

DJI Flysafe Database is pre-installed within the aircraft and the Command Unit. This prevents the UA from flying in high-risk areas and prevents the aircraft from breaching altitude restrictions

Geocaging

Although geographical geo-caging is not utilised during operations, the aircraft will be geocaged throughout operations by setting the maximum altitude and distance the UA can be from the RP.

Although geographical geo-caging is not utilised during operations, the aircraft will be geocaged throughout operations by setting the maximum altitude and distance the UA can be from the RP.

Information

DJI Agras T25

DJI Agras T50

C2 Protocol

DJI Proprietary – OccuSync Enterprise

C2 Transmitting Power

2.4000-2.4835 GHz

<20 dBm (CE/SRRC/MIC)

5.725-5.850 GHz

<14 dBm (CE)

2.4000-2.4835 GHz

<20 dBm (CE/SRRC/MIC)

5.725-5.850 GHz

<14 dBm (CE)

Maximum Operating Distance (CE)

4000m

4000m

Operating Frequency

2.4000-2.4835 GHz

5.725-5.850 GHz

2.4000-2.4835 GHz

5.725-5.850 GHz

Video Transmission

2.400 – 2.483 GHz

5.725 – 5.850 GHz

2.4000-2.4835 GHz

5.725-5.850 GHz

Transmission Security

Enhanced O3 Transmission System: upgraded quad-antenna O3 Transmission system that ensures reliable communication even in areas without cellular coverage. 

C2 link security is ensured through proprietary DJI security algorithms. AES256 encryption is present to ensure secure data transmission of the command & control uplink and video transmission downlink.

The C2 link is also secured by pairing the remote and UA together, ensuring no other remote can control the UA.

Enhanced O3 Transmission System: upgraded quad-antenna O3 Transmission system that ensures reliable communication even in areas without cellular coverage. 

C2 link security is ensured through proprietary DJI security algorithms. AES256 encryption is present to ensure secure data transmission of the command & control uplink and video transmission downlink.

The C2 link is also secured by pairing the remote and UA together, ensuring no other remote can control the UA.

Information

DJI Agras T25/T50

DJI Agras T25/T50

Summary

Remote Control. 

Remote Control. 

Remote Control System

Proprietary ‘Smart Controlled’

Proprietary ‘Smart Controlled’

Command Unit Name

1. External RC Antennas

Relays the aircraft control and image transmission signal.

2. Touchscreen

Displays system and app views and supports up to 10 touchpoints. Android-based device for running the DJI Agras app.

3. Indicator Button (reserved)

4. Control Sticks

Controls aircraft movement. Control mode can be set in DJI Agras.

5. Internal Wi-Fi Antennas

Do not block the internal Wi-Fi antennas during use, otherwise, the signals may be affected.

6. Back Button Press once to return to the previous screen. Press twice to return to the home screen. Hold the back button and press another button to activate button combinations. Refer to the Button Combinations section for more information.

7. L1/L2/L3/R1/R2/R3 Buttons

When buttons are displayed in the app near these physical buttons or the prompts in the app including L1/L2/L3/R1/R2/R3, press the corresponding button on the remote controller to operate instead of tapping the touchscreen.

8. Return to Home (RTH) Button

Press and hold to initiate RTH. Press again to cancel RTH.

9. Microphones

10. Status LEDs

Indicates the status of the remote controller. Refer to the Guide on the home screen for more information.

11.  Battery Level LEDs

Displays the current battery level of the internal battery.

12. Internal GNSS Antennas

Do not block the internal GNSS antennas during use. Otherwise, the positioning accuracy may be affected.

13.  Power Button

Press once to check the current battery level. Press, and then press and hold to power the remote controller on or off.

When the remote controller is powered on, press once to turn the touchscreen on or off.

14.  5D Button

15. Flight Pause Button (reserved)

16.  Button C3

Customizable button.

17.  Left Dial

Turn to adjust the spray rate in Manual operation mode.

18. Spray/Spread Button

Press to start or stop spraying/spreading in Manual operation mode.

19.  Flight Mode Switch

The three positions of the switch correspond to N-mode (Normal), S-mode

(Attitude), and F-mode (Normal).

20. Internal RC Antennas

Relays aircraft control image 

transmission signals. Do not block the internal RC antennas during use. Otherwise, the signals may be affected.

21.  microSD Card Slot

Slot to insert a microSD card.

22.  USB-A Port

For connecting devices such as the RTK Dongle. When it is connected to the intelligent charger or multifunctional

inverter generator, users can view the device status information in DJI Agras.

23.  HDMI Port

The output of the HDMI signal to an external monitor.

24. USB-C Port

For charging the remote controller or connect to a computer to update firmware

and export logs via the DJI Assistant 2 software.

25. FPV/Map Switch Button

In Operation View in DJI Agras, press to switch between FPV and Map View.

26. Right Dial

Turn to adjust the tilt of the FPV camera.

27. Scroll Wheel (reserved)

28. Handle

29. Speaker

30. Air Vent

For heat dissipation. Do not block the air vent during use.

31. Reserved Mounting Holes

32. Button C1

In Route (A-B) operation mode, press to record Point A.

In Manual Plus operation mode, press to steer the aircraft left.

33.  Button C2

In Route (A-B) operation mode, press to record Point B.

In Manual Plus operation mode, press to steer the aircraft right.

34. Rear Cover

35. Battery Release Button

36. Battery Compartment

For installing the WB37 Intelligent Battery.

37. Rear Cover Release Button

38. Alarm

39. Air Intake

For heat dissipation. Do not block the air intake during use.

40. Dongle Compartment

The USB-C connector in the compartment is used to connect the DJI Cellular Dongle.

41. Strap Bracket

Command Unit Interface

Built-in battery 3250 mAh / 7.2V

Built-in battery 3250 mAh / 7.2V

Remote Current / Voltage

Lithium Ion

Lithium Ion

Remote Control Battery Type

3250 mAh

3250 mAh

Battery

-20° to 50° C

-20° to 50° C

Operating Temperatures

Remote control touchscreen

Remote control touchscreen

Interface

Integrated interface powered through a built-in battery.

Integrated interface powered through a built-in battery.

Interface Power Arrangements

In the event of low charge on the internal battery, an external battery can charge the built-in battery. The External battery is interchangeable with WB37 Intelligent Batteries, allowing continuous power provisions. 

In the event of low charge on the internal battery, an external battery can charge the built-in battery. The External battery is interchangeable with WB37 Intelligent Batteries, allowing continuous power provisions. 

Emergency Power Supply

Refer to the policy for all updates defined within section 2.3.10C

Refer to the policy for all updates defined within section 2.3.10C

Firmware and Software Updates

Refer to the policy for all updates defined within section 2.3.12C

Refer to the policy for all updates defined within section 2.3.12C

Information

DJI Agras T25

DJI Agras T50

Single Point of Failures Identified within UAS

• Single Battery Failure

• Power Management Unit Failure

• Power Distribution Failure

• Single Battery Failure

• Power Management Unit Failure

• Power Distribution Failure

Known Failure Mode

Preventative Strategies

Propulsion Failure Modes

Complete loss of multiple propellers within the Agras T25 T50 will result in difficulty with control of the UA, uncontrollable flight profile or uncontrolled descent into terrain. 

• Propellers are checked for damage and airworthiness during pre-flight checks.

• The attachment of the propeller to the propeller mounting is checked during pre-flight checks. 

• Propellers are checked as part of the maintenance regime.

Failure of multiple mounts of the T40 will cause the ejection of the propeller from the propeller mounting,

• Propeller mountings are checked for damage and airworthiness during pre-flight checks.

• Propellers are checked as part of the maintenance regime.

Multiple motor failures will result in the UA uncontrollably descending into the terrain. 

• The UA will warn of any issues with the motors, such as a ‘motor-blocked signal before take-off and whilst in flight. 

• Motors are visually checked during pre-flight checks. 

• Motors are checked as part of the maintenance regime. 

Multiple failures of the motor mounting will cause the motor to dismount from the rotor arm, causing the UA to uncontrollably descend into the terrain.

• Motor mountings are visually checked during pre-flight checks. 

• Motor mountings are checked as part of the maintenance regime. 

Failure of multiple electronic speed controllers, for the T40, during flight will result in an uncontrollable flight profile, resulting in the UA uncontrollably descending into terrain.

• The UA will conduct a check of the ESC and will present an alert if there is an issue before the flight is undertaken.

• The UA will not be flown in any precipitation, as this presents a historical risk to DJI ESCs. 

Structural Failure Modes

Failure of a single rotor arm during the flight will cause the T25/ T50 UA to uncontrollably descend into terrain.

• Rotor arms and mounts are checked for damage during pre-flight checks.

• Rotor arm condition is checked as part of the maintenance regime. 

Power Failures

Single battery failure in the DJI Agras series will cause an immediate full loss of power, resulting in the UA uncontrollably descending into terrain. 

• The battery is checked for swelling and damage during pre-flight checks.

• The UA will self-check the battery for any issues. 

• The battery is self-heated to increase performance and prevent a higher internal resistance which can result in false readings.

• The RP will only take off when the battery is above 90%.

• The battery is a ’smart battery’. As such it will ‘self-manage’ and self-discharge as required. 

• A battery maintenance regime is carried out by the organisation.

Power Management Unit Failure will cause an immediate full loss of power, resulting in the UA uncontrollably descending into terrain

• The external condition of the Unmanned Aircraft is checked before any flights are undertaken.

• Only genuine DJI batteries are utilised to mitigate the risk of incorrect power loads damaging internal circuitry.  

Power Distribution Failure will cause an immediate full loss of power, resulting in the UA uncontrollably descending into terrain

• The external condition of the Unmanned Aircraft is checked before any flights are undertaken.

• Only genuine DJI batteries are utilised to mitigate the risk of incorrect power loads damaging internal circuitry.  

Flight Control Failures

Loss of the required number of satellites for P-GPS mode, resulting in the aircraft reverting to ATTI (Non-GPS) Mode

• A site survey is conducted before every flight. Areas of GPS loss risks will be identified by the Remote and mitigated.

• The Remote Pilot will fly the aircraft in ATTI mode. Following a dynamic risk assessment, the Remote Pilot will either return the aircraft to TOLS or continue to mission in ATTI Mode. 

• All Drone Ag Limited Pilots are trained to fly in ATTI Mode. This skill is revalidated by the accountable manager every year. 

Loss of command signal between the Command Unit and the Unmanned Aircraft will cause the aircraft to enter Return to Home mode.

• Before a flight is conducted, a minimum level of satellites will be located before take-off, to ensure the aircraft enters ‘P-GPS’ mode. 

Flight Controller Failure will cause the aircraft to become difficult to control. 

• The UA will self-check its systems before each flight. If an error with the Flight Controller is detected, the UA will not take off.

• Remote Pilots are taught in emergency procedures and will return the aircraft home immediately.  

Compass error or failure will cause the aircraft to become difficult to control

• The UA will self-check its systems before each flight. If an error with the Flight Controller is detected, the UA will not take off.

• Remote Pilots are taught in emergency procedures and will return the aircraft home immediately. 

Maintenance Check

Pre-Flight Checks

Every 20 Hours or Every 3 Months (Whichever comes first)

Airframe 

• Visual Inspection of the entire Airframe for damage

• Physical Inspection of all areas

• Check correct assembly.

• Checking all Screws & bolts, ensuring tightness. Where required, if screws or bolts are discovered to be loose, thread locker will be utilised. 

Antennas

• Visual check of aircraft antennas

• Visual check for damage.

Rotor Arms

• Visual Check

• Ensure collar arms are correctly positioned where applicable

• Physical inspection.

• Where applicable, check collar arms are showing no signs of wear or damage. 

• Fully assemble rotor arms, ensuring collar arms do not allow significant play or movement. 

Motors

• Visual Check

• Physical Checks to ensure moving freely.

• Dry Running, listening for any mechanical grinding sounds. 

• Following dry running, the temperature of each motor is checked to ensure uniformity. This is complete by touch and does not require any tool. 

Propeller

• Visual Check

• Physical Check

• Replaced if damage noted

• Visual Check

• Physical Check 

• Replaced if damage noted

Spray System

• Visual Check

• Physical Check

• Pre-spray checks as required

• Visual Check

• Physical Check

• Replacements as required (Lines etc)

Battery

• Visual Check for swelling 

• Visual Check for damage

• Visual Check for swelling 

• Visual Check for damage

• Full discharge of battery if required. 

Gimbal

• Visual Check for Damage

• Visual check for damage

• Recalibration

• Check correct function.

• Check gimbal dampeners for correct function.

Compass 

• Status Checked via DJI Application

• Recalibrated if required

• Recalibrated Completed

IMU 

• Status Checked via DJI Application

• Recalibrated if required

• Recalibrated Completed

Radar

• Status Checked via DJI Agras App

• Recalibrated if required

• Status Checked via DJI Agras App

• Recalibrated Completed if required.

Payloads

• Visual check for damage

• Check secure attachment

• Physical inspection. 

• Ensure correct function.

Command Unit

• Check battery level.

• Check function.

• Check antennas correctly installed, and unfolded. 

• Check battery levels.

• Check function.

• Check for damage.

• Complete stick calibration

Information

DJI Agras T25

DJI Agras T50

Manufacturer Standard External Lighting

Adequate lighting is installed on each arm of the UAS. These consist of solid green LEDs at the rear and solid red LEDs at the front of the UA. These allow for conspicuity at night, sufficient to track the path of the UA and to allow for deconfliction.   

Adequate lighting is installed on each arm of the UAS. These consist of solid green LEDs at the rear and solid red LEDs at the front of the UA. These allow for conspicuity at night, sufficient to track the path of the UA and to allow for deconfliction.   

Non-Standard External Lighting

If the remote Pilot deems that additional conspicuity lighting is required following a risk assessment, a flashing white LED will be attached underneath the UA via 3M Dual Lock. A further LED can be attached on the top of the UA if required.  

External LED Specifications

Strobon Cree Standalone

Dimensions: 20mm x 16mm x 8mm

Weight: 4grams

Battery Life: 2 Hours continuous operation. 

Manufacturers rated visibility distance: 3km

If the remote Pilot deems that additional conspicuity lighting is required following a risk assessment, a flashing white LED will be attached underneath the UA via 3M Dual Lock. A further LED can be attached on the top of the UA if required.  

External LED Specifications

Strobon Cree Standalone

Dimensions: 20mm x 16mm x 8mm

Weight: 4grams

Battery Life: 2 Hours continuous operation. 

Manufacturers rated visibility distance: 3km