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Garmin GFC 500 Autopilot Notice

Ken Kueny

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Received this notice this morning from FAA/Garmin. For those folks with G3X Touch planes (F2, others?) and a Garmin autopilot, this is pretty serious. The software patch is available via links to Garmin. It was easy to install with an SD card. 



Notice Number: NOTC2741

Garmin has identified an issue with GFC 500 autopilots with optional auto trim installed in certified, experimental and Light-Sport Aircraft, including certified installations installed with optional GSA 28 pitch trim in accordance with Garmin STC SA01866W. This issue may result in an uncommanded automatic trim runaway when the autopilot is first engaged. This condition could result in a sudden and significant deviation from the intended flight path. 

Garmin Service Alert 22109 Revision A requires operators of certified installations to pull and collar the autopilot circuit breaker and placard the autopilot as “inoperative” prior to further flight.  Operators may contact a Garmin dealer regarding reactivation of the GFC 500 autopilot with the optional pitch trim configured off in accordance with recommended service bulletin 22110 Revision A.

Garmin is working to fix this issue for certified installations in a future software update expected in Q4 2022.

Garmin Service Bulletin 22112 Revision A requires operators of Experimental and Light-Sport Aircraft to update system software or disable the autopilot or trim control prior to further flight.

Service Alert 22109 Rev A is available at:

The recommended Service Bulletin 22110 Rev A is available at:

For non-certified aircraft, Service Bulletin 22112 Rev A is available at:

If you have any questions or comments, contact the Wichita ACO Branch at:
Phil Petty
1801 Airport Rd.
Wichita, KS 67209
(316) 946-4139

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