Over the years, Piper introduced several different variants of the PA-31 Navajo. This includes the PA-31-300, which was powered by two Lycoming IO-540 engines, which were not turbocharged.

Piper's PA-31-350 is the latest aircraft certified to use the Garmin GFC 600 autopilot. [Credit: Shutterstock] Availability of popular Garmin (NYSE: GRMN) autopilots in the general aviation ...