(2023) Service Alert 22109 Rev B: Automatic Pitch Trim

REVISION B:

Added Resolution

PRODUCTS AFFECTED:

All Garmin GFC 500 Autopilots with an optional GSA 28 pitch trim servo including those installed by STC SA01866WI are affected.

NOTE
GFC Autopilots installed in Cirrus SR20/22 aircraft using STC SA01866WI are not affected.

NOTE
For Experimental and Light Sport installations refer to Garmin Service Bulletin 22112.

ISSUE:

An un-commanded automatic pitch trim runaway may occur when the autopilot is first engaged.

WARNING
Engagement of the autopilot with this condition may result in an un-commanded deviation from the intended or desired flight path

ACTION:

Before further flight, one of the following actions must be completed:

Disable the GFC 500 Autopilot by pulling the AUTOPILOT circuit breaker and placard the Autopilot ‘Inoperative.’

OR

Contact a Garmin dealer to disable the pitch trim as directed in Garmin STC SA01866WI Service Bulletin 22110.

RESOLUTION:

Refer to Garmin STC Service Bulletin 22123.