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Piston twins
Retrofit AvionicsGarmin Gains STC for GFC 600 Autopilot in Piper Navajo Chieftain
The avionics company continues to add mode legacy aircraft to its certification list.
Jonathan Welsh![](https://www.flyingmag.com/uploads/2023/05/shutterstock_2099401144.jpg?auto=webp&auto=webp&optimize=high&quality=70&width=1440)
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