Garmin’s (GRMN) GFC 500 Autopilot STC to Aid Aviation Unit Posted byShilpa Mete January 7, 2022 Leave a comment on Garmin’s (GRMN) GFC 500 Autopilot STC to Aid Aviation Unit Garmin (GRMN) receives a Certification from FAA for GFC 500 digital autopilot use in Beechcraft 35 models C-G and select Cirrus SR20 models.