OSB Number: SOSB-24-V14
Date: 21 November 2024
Operational Impact: Operational Impact: In rare instances, one motor may start slower than others before launching, potentially causing minor delays. This behavior does not pose a safety risk, as it is an expected part of the system health check.
Products affected: Skydio X10, X10D, X2, X2D
Description, Identification, and Manifestation
Prior to launch, the drone initiates a health check by starting all four motors to verify they are in sync and ready to produce the necessary thrust for launch. In rare scenarios, one motor may spin up more slowly than the others, but will eventually reach normal speed. If syncing is successful, the autonomous launch will continue as expected. If synchronization is not achieved within a predetermined timeframe, the drone will autonomously abort the launch and all four motors will stop.
There is no risk of a launch proceeding without full motor synchronization.
Mitigation
Skydio Actions
Occasional delayed motor spin-up is anticipated within the motor and flight control system design. Skydio continuously reviews flight test data and makes incremental improvements that minimize delayed spin-up.
Operator Actions
Pilots should be trained to recognize delayed motor spin-up and to perform the following preflight checks:
- Unfold the propellers, position the drone on the ground, and ensure there are no obstructions that could interfere with spinning propellers.
- Ensure all propellers are firmly attached and the blades are free to swing around the hinges. When rotating by hand, each motor should have consistent, low resistance.
- Inspect the motor windings for any discoloration. Review the Damaged Motor Stator NTO for motor charring inspection instructions.
- If a motor produces a crunchy sound or rough sensation when turned by hand, this may indicate dust, sand, or other debris, or damage to the bearing, and should be resolved before flight. If cleaning with clean compressed air does not resolve the issue, the drone may require service or repair.
- If a delayed motor spin-up results in an aborted launch, and no mechanical damage or obstructions are found, it is safe to attempt another launch.