Troubleshooting
General Warnings
Symptom | Potential Cause | Potential Solution |
Boot Fail | Voltage limits exceeded | Check voltage of flight packs and replace as necessary |
Compass readings out of limits | Check surroundings and boot in an area away from ferrous objects. Recalibration of the compass. | |
Compass Warning | Invalid compass calibration | Calibrate the compass |
GPS Warning | GPS/Compass Unit has become disconnected | Check the GPS/Compass unit wiring for damage |
Accelerometer Warning | Hard landing | Reboot ALTA Pro |
Motor Warning | ESC or Motor failure or error | Contact Freefly Customer Support immediately. Do not continue flying ALTA Pro. |
Flight Controller
Symptom | Potential Cause | Potential Solution |
ALTA Pro will not arm | Radio not bound | Follow radio controller manufacturer’s binding procedure |
Radio not mapped properly | Check radio mapping charts for correct behavior. Adjust mapping as necessary in ALTA Pro QGroundControl | |
Flight Controller boot not successful | Power cycle ALTA Pro. Ensure it does not move during boot If ALTA Pro must move during boot (such as on a moving platform), use Motion Booting | |
Low Battery | A low battery error latches and does not allow further take off without a battery replacement. |
Flight Behavior
Symptom | Potential Cause | Potential Solution |
Unexpected flight behavior | Tuning too high or too low | Revert tuning to the last known working configuration Set tuning back to default values |
Alta Pro seems to "hop" or "dip" at the end of a climb | Hover throttle not set correctly | Change hover throttle to match weight of aircraft. 49% for ~10lb payload, closer to 40% for light aircraft. |
ALTA Pro does not maintain level pitch or roll | Pitch or Roll Trim position not set | Use the ALTA app to set the appropriate pitch and roll trim |
ALTA Pro oscillates or vibrates during flight | Tuning too high or too low | Check flight settings and tuning parameters in the App. Revert tuning to the last known working configuration. Re-tune. |
Propellor Damage | Check for damage to propeller blades. Replace with spares as required. | |
Propeller blades unbalanced | Replace with spares as required. Propeller blades are balanced and matched at the factory. | |
Hinge or motor misalignment | Thoroughly inspect ALTA Pro following any accident. Contact Freefly for further inspection and assessment. | |
Ice on Propellers | Ice build-up is causing vibrations due to unbalanced propellers. Remove ice from propellers before further flights. | |
ALTA Pro is sluggish in response to commands | Tuning too low | Check tuning in ALTA Pro and adjust as required |
Flight weight is over limit | Weigh the ALTA Pro and compare to the Allowable Gross Weight table in this manual. Remove weight. | |
ALTA Pro ascends or descends when switching between flight modes | Hover Throttle set incorrectly | Follow the instructions listed in the ALTA Pro Flight Parameters section of this manual to adjust Hover Throttle |
ALTA Pro does not maintain heading | Yaw during boot | Re-initialize ALTA Pro while keeping ALTA Pro stationary in all directions |
Unexpected behavior in Position Mode | Position lock not achieved | Monitor ALTA Pro QGroundControl and takeoff only after Position Lock has been achieved with strong GPS signal |
Incorrect heading due to yaw during boot | Re-initialize ALTA Pro while keeping ALTA Pro stationary in all directions | |
Compass corruption or calibration | Check surroundings for ferrous objects or magnetic interference. Calibrate the compass. | |
ALTA Pro circles a point in Position Mode | Compass calibration is invalid | Calibrate the compass |
Position tuning values too high | Reduce Position tuning values very slightly following the PX4 tuning guide. | |
ALTA Pro does not track straight in Position Mode | Compass calibration invalid | Perform a manual compass calibration. |
ALTA Pro does not Return-to-Land when commanded | Position Lock not achieved | Monitor the ALTA Pro QGroundControl to ensure position lock has been achieved with strong GPS signal |
ALTA Pro wobbles when descending | Vertical descent into turbulent air from propellers | Descend at a slight angle relative to vertical so the ALTA Pro does not fly into turbulent air from propeller downwash |
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