The PA-31-300 was only produced in 19 and had the smallest production total for any PA-31 series model, with only 14 aircraft built. Following the introduction of the PA-31-300 the turbocharged model began to be known unofficially as the PA-31-310. A pair of 300 hp (224 kW) Lycoming IO-540-M1A5 engines were fitted to the PA-31-300, driving two-bladed propellers. This model was the only one of the PA-31 series not to have turbocharged engines. The PA-31-300 was the next model, certified by the FAA in June 1967. The PA-31, now named 'Navajo' after a Native American tribe, was not certified by the Federal Aviation Administration (FAA) until 24 February 1966, and deliveries did not begin until the following year, after the type was recertified in mid-1966 with an increase in maximum takeoff weight (MTOW) from 6,200 lb (2,812 kg) to 6,500 lb (2,948 kg). As testing proceeded two cabin windows were added to each side of the fuselage and the engines moved further forward. It was a low-wing monoplane with a conventional tail, powered by two 310 hp (231 kW) Lycoming TIO-540-A turbocharged engines in so-called 'tiger shark' cowlings, a feature shared with the Twin Comanche and also the PA-23 Aztec. The type, now designated the PA-31 and looking like a scaled-up Twin Comanche, was officially announced in late 1964 after its first flight on 30 September that year. Piper, Piper began development of a six- to eight-seat twin-engined corporate and commuter transport aircraft in 1962 under the project name Inca. At the request of company founder William T.
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