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