Garmin’s (GRMN) New GFC 500 Certification to Aid Aviation Unit Posted byShilpa Mete October 7, 2021 Leave a comment on Garmin’s (GRMN) New GFC 500 Certification to Aid Aviation Unit Garmin (GRMN) receives STC from the FAA for GFC 500 autopilot use in Beechcraft 19 Sport, Beechcraft 23 Musketeer/Sundowner, and Beechcraft 24 Musketeer/Sierra aircraft models.