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Piper Navajo Pa-31 - Side View. Twin Piston Engine Powered Aircraft. Maximum Passengers 7. Speed 175Kts (325Km/H). Endurance 5 Hours. Range 1460Km With Required Fuel Reserves. The Piper Pa-31 Navajo, A Twin-Engine Aircraft Designed And Built By Piper Aircraft For The General Aviation Market, Most Using Lycoming Engines. Production Of The Pa-31 Ceased In 1984.