DJI Agras T70P: Preflight, Takeoff, Flight Modes y Return-to-Home
DJI Agras T70P: Preflight, Takeoff, Flight Modes y Return-to-Home
La sección 3 del DJI AGRAS T70P User Manual v1.0 (2025.11) describe el flujo normal de vuelo: compass calibration, preflight, motor start/stop, takeoff, landing, flight modes y los principales Return-to-Home paths. Esta guía conserva ese orden porque cada etapa depende de la anterior.
Resumen: cargue todos los devices, revise propulsion/sensors/antennas, asegure battery, tank, arm locks y cables, confirme que el spraying system no tenga blockage/leaks y revise cada DJI Agras warning. Calibre compass cuando la app lo solicite, preferiblemente con empty tank. Inicie motors con uno de los Combination Stick Commands del manual. Para emergency-only motor stop use C1 + C2 + Flight Pause. Smart RTH requiere Home Point recorded y strong GNSS. Low Battery RTH y Failsafe RTH siguen reglas separadas.
1. Compass calibration only when prompted
DJI says compass calibration affects flight safety and should be performed when DJI Agras requests it.
2. Avoid strong magnetic interference during calibration
Do not calibrate near utility poles, steel-reinforced walls or other strong magnetic sources.
3. Remove ferromagnetic objects
Keys, mobile phones and other ferromagnetic items can interfere with calibration.
4. Empty tank recommended
DJI recommends performing compass calibration with an empty tank.
5. Do not calibrate routinely without reason
The manual frames calibration as an app-prompted procedure, not something to repeat before every flight by default.
6. Fully charge all devices
Start preflight with sufficient power in aircraft, controller and related devices.
7. Use genuine components
DJI includes genuine components in its normal-flight preflight requirements.
8. Motors and propellers
Inspect for damage, obstruction and abnormal condition before takeoff.
9. Vision system
Make sure cameras/sensors are clean, unobstructed and in good condition.
10. Radar and antennas
These should also be unobstructed and physically normal.
11. Flight battery secure
Battery installation must be correct and firm.
12. Spray tank secure
Confirm the tank is correctly installed.
13. Arm locks
Verify each lock is fully engaged before takeoff.
14. Cables
Check that relevant cables are securely connected and undamaged.
15. Spraying system: no blockage
Blockage should be resolved before operation.
16. Spraying system: no leaks
Leaks are a preflight fail condition.
17. Sprinklers must operate normally
Function matters, not just visual presence.
18. Remove lightweight debris
Clear plastic bags, fertilizer bags and loose film from the task area so airflow cannot pull them toward propulsion or sensors.
19. Review every DJI Agras warning
Do not ignore an aircraft-status message because takeoff is still technically possible.
20. Payload recommendation
DJI Agras intelligently recommends a payload limit based on aircraft condition and surroundings. Do not exceed it.
21. Starting the motors
Use one of the Combination Stick Commands shown by DJI, then release both sticks once the motors begin spinning.
22. Do not improvise the start command
Use the manufacturer-defined CSC rather than experimenting with stick positions.
23. Emergency motor stop
DJI identifies C1 + C2 + Flight Pause held simultaneously as an emergency-only method to stop the motors mid-flight.
24. Emergency motor stop causes a crash
This action should only be used when deliberately crashing the aircraft reduces a greater risk of injury or property damage.
25. Takeoff surface
Use open, flat ground.
26. Aircraft orientation
The manual instructs the operator to take off with the rear of the aircraft facing the pilot.
27. DJI Agras must be functioning normally
Do not begin normal flight with app malfunction or unresolved aircraft-status errors.
28. Confirm Home Point before takeoff
Home Point status matters directly to Smart RTH and failsafe behavior.
29. Gentle takeoff input
Push the throttle upward gently and rise to a safe height.
30. Do not rush away immediately after liftoff
Use the initial hover to confirm aircraft response, telemetry and stable positioning before beginning the task.
31. Landing surface
Land on an open, flat area.
32. Stop motors after touchdown
Hold the throttle down until the motors stop.
33. Low battery before landing
If a low-battery warning appears before landing is complete, land as soon as possible.
34. Normal mode
Normal mode supports precise positioning when positioning data is healthy.
35. Attitude mode
Attitude mode maintains altitude but not precise horizontal position.
36. Wind matters more in Attitude mode
The aircraft can drift because precise position hold is unavailable.
37. Unexpected Attitude mode
DJI recommends landing in a safe place as soon as possible if weak positioning causes an unexpected mode transition.
38. Smart RTH requirements
Home Point must be recorded and GNSS sufficiently strong.
39. Start Smart RTH
Press and hold the RTH button on the remote controller.
40. Smart RTH can be cancelled
If conditions make manual flight safer, the operator can cancel RTH and control the aircraft.
41. Low Battery RTH
The aircraft calculates whether the current battery state is sufficient to return toward the Home Point.
42. Low Battery RTH is different from critical battery
Critical low battery belongs to the emergency branch and can force an automatic descent/landing that cannot be cancelled.
43. Failsafe RTH
If controller signal is lost and the configured lost-signal action is RTH, the aircraft enters Failsafe RTH.
44. Signal-loss threshold
The emergency chapter specifies that signal loss longer than 3 seconds triggers the configured lost-signal action.
45. Lost-signal options
Depending on configuration, the aircraft can RTH, land or hover.
46. Link restored during RTH
When the connection returns, the operator can cancel RTH and regain control if appropriate.
47. Obstacle avoidance during RTH is conditional
Do not assume RTH is an obstacle-proof autopilot mode.
48. Power lines and small obstacles remain hazards
Sensor blind spots and environment-specific limitations still apply during return.
49. Landing Protection
During automatic landing, Landing Protection normally causes the aircraft to descend to 3 m above ground and hover for landing-area verification.
50. Fixed RTK exception
With fixed RTK positioning, the aircraft lands directly instead of entering the 3 m hover step described by DJI.
51. Full preflight checklist
- compass status normal;
- devices charged;
- propulsion inspected;
- vision/radar/antennas clear;
- battery/tank secure;
- arm locks engaged;
- cables secure;
- spray system no blockage/leak;
- task area clear;
- DJI Agras warnings reviewed;
- payload recommendation reviewed;
- Home Point recorded.
52. Takeoff acceptance checklist
- open/flat ground;
- rear of aircraft facing operator;
- app normal;
- no aircraft-status errors;
- Home Point valid;
- motors started with correct CSC;
- initial hover stable.
53. RTH planning should happen before takeoff
Know the configured lost-signal action, expected RTH route and obstacles before a link or battery event occurs.
54. Do not treat Home Point as permanent
If your operation changes location, verify the Home Point shown in DJI Agras before relying on RTH.
55. Common error: compass calibration beside steel structures
DJI warns against magnetic interference.
56. Common error: ignoring one app warning because everything else looks normal
Review all messages before takeoff.
57. Common error: using emergency motor stop as a normal stop method
It is for emergency risk reduction only.
58. Common error: assuming RTH will automatically avoid every obstacle
The manual does not support that assumption.
59. Questions
When should I calibrate the compass?
When DJI Agras prompts you.
How do I start the motors?
Use one of DJI's Combination Stick Commands.
What is the emergency motor-stop command?
Hold C1 + C2 + Flight Pause; use only when crashing is safer than continued uncontrolled flight.
What triggers Failsafe RTH?
Controller-signal loss with RTH configured as the lost-signal action.
What does Landing Protection do?
Normally pauses auto landing at about 3 m so the landing area can be verified.
Source and revision
Primary source: DJI AGRAS T70P User Manual v1.0, 2025.11, sections 3.3–3.7.
