Preparing for Flight
This section describes preflight preparations, including powering on the equipment, connecting QGC Ground Station, and performing preflight checks.
3 min read · English documentationThis section describes preflight preparations, including powering on the equipment, connecting QGC Ground Station, and performing preflight checks.
Remote Controller Channels
Note: Before the UAV takes off, switches SWA/SWB/SWC/SWD on the remote controller must be in their default top positions. Check before takeoff that all channel switches are in the top position.

| Name | Switch | Top Position | Middle Position | Bottom Position |
|---|---|---|---|---|
| H16 Remote Controller | SW1 | Disarm the UAV | Unused | Arm the UAV |
| SW2 | POSCTL remote controller Position mode in INIT control state; the coordinate frame is based on the aircraft body frame |
Remote controller control mode in Offboard mode under RC_POS_CONTROL control state; the coordinate frame is based on the ENU inertial frame |
Autonomous control mode in Offboard mode under COMMAND_CONTROL control state |
|
| SW3 | Disable emergency landing | Unused | Enable emergency landing (locks the propellers immediately) | |
| SW4 | Disable landing | Unused | Enable landing (slow descent) |
Power On
- Power on the aircraft
- Power on: Briefly press the aircraft power button. After power-on, the LED under each of the four motors illuminates.
- Power off: Press and hold the aircraft power button. After power-off, the LEDs under the four motors turn off.
- Power on the remote controller
- Check the battery level: Briefly press the remote controller power button to display the remaining battery percentage.
- Power on the remote controller: Press and hold the remote controller power button. The remote controller starts and displays the main interface.
- Power off the remote controller: Press and hold the remote controller power button. When the options appear, tap Power Off. The remote controller displays the power-off screen.
Connect QGC Ground Station
- To connect QGC, see Preparing the Communication Link—H16 Remote Controller Integrated Data Link Communication.
Preflight Check
- Place the aircraft outdoors on level, open ground. Ensure there are no obstacles, buildings, trees, or other obstructions nearby. The pilot must stand 5 m from the aircraft and face its tail.
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Check the battery level and install the battery.
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Check that the aircraft's exterior is intact, with no visible collision damage or abnormalities.
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Confirm that the safety tether is ready.
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Ensure that the aircraft's gimbal camera faces forward.
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Ensure that the remote controller antennas are unfolded.
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Power on the remote controller and ensure that all its switches are in their default positions: SWA–SWD are in the top position by default. Power on the aircraft. Check the signal-strength indicator in the remote controller status bar to confirm that it has paired successfully with the aircraft receiver and has control authority over the aircraft.
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Connect to QGC Ground Station and open the flight interface. Check the satellite count, flight mode, battery level, remote controller settings, flight-mode settings, and other flight-related parameters. Ensure that parameter settings and calibrations meet your requirements to maintain flight safety.
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If multiple aircraft are being tested simultaneously, divide the airspace between them to prevent midair collisions and serious safety accidents.
Correct RTK Data Deviation
Note: This Operation Can Be Performed Only While the UAV Is Disarmed!
QGC Ground Station procedure
- Click MAVLink Inspector.
- Scroll down and locate LOCAL_POSITION_NED.
- When the X, Y, and Z values are close to 0, calibration is successful and the UAV can take off normally.
Prometheus Ground Station Pro procedure
- Click Feature Scripts in the ground station.
- Click ekf2 stop.
- Click ekf2 start.

Clear the Alarm
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Move SW1 to the bottom position to arm the UAV. The beeping alarm will stop.
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Move SW1 to the top position to disarm the UAV, or move SW3 to the bottom position to lock the propellers and disarm the UAV with one action.
