Avionics
Garmin Resolves GFC 500 Runaway Trim Issue
Pending the latest fix, owners of aircraft affected by the potential Garmin GFC 500 runaway trim issue had to disable elevator pitch trim systems.
Trim wheel on Garmin GFC 500 being adjusted by pilot
Garmin has resolved "potential runaway pitch trim issues" affecting some GFC 500 autopilot systems. (Photo: Garmin)

The FAA has approved Garmin’s software update and service bulletin to fix the “potential runaway pitch trim issue” that has affected some GFC 500 autopilots. The situation applies to aircraft that are equipped with the GFC 500 and optional pitch trim.

Garmin explained that the software update for the GFC 500 with G5 instruments and G3X Touch displays “allows pitch trim to be enabled as a closing action to Service Alert 22109 and STC Service Bulletin 22110." The Olathe, Kansas, avionics manufacturer expects to release software to cover GI 275 instrument installations “in the coming weeks.”

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