Garmin announced today (March 15) that it has received FAA Supplemental Type Certificates (STCs) for its GFC 500 autopilot for select Robertson STOL-equipped Cessna 206 models and Piper Twin Comanche PA30B and Cs and -39s. The current list of aircraft models approved for retrofit with the digital GFC 500 spans 26 lines, with multiple variants included within each STC.
This is a companion discussion topic for the original entry at https://www.avweb.com/aviation-news/garmin-adds-two-new-piston-aircraft-lines-to-its-gfc-500-market-list