Date Released: Feb 17 2020
Effectivity: All Alta X
INTRODUCTION
This service bulletin is being issued to alert all Alta X pilots of an intermittent failure of Motors to start spinning upon initial startup.
BACKGROUND
Freefly has received ~5 reports of Motor 1 not starting properly in the field. Freefly has completed the first stage of our investigation into the issues. We developed an automated test that power cycles the Alta X and initiates a startup command. Over the course of 8,396 test cycles we detected 19 instances in which a motor did not start properly. We have traced the condition back to the Motor Drive and have observed that occasionally the motor drive will falsely signal a ‘phase error’ failure. We do not understand the conditions for this error to occur and are working to understand the root cause.
DISCUSSION
Some key points to convey regarding this issue:
RECOMMENDATION
See attached PDF for full details
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