The Piper PA-31 Navajo is a family of twin-engined utility aircraft designed and built by Piper Aircraft for small cargo and feeder airlines, and as a corporate aircraft. Production ran from 1967 to 1984. It was license-built in a number of Latin American countries.

The Piper PA-31T Cheyenne is a twin-engine turboprop development of the earlier PA-31P Pressurized Navajo. Originally, the aircraft was an upgraded version of the Pressurized Navajo equipped with two Pratt & Whitney Canada PT6 A-28 turboprop engines.

The Piper PA-31 Navajo was designed and produced by Piper Aircraft as a series of cabin-class twin-engined aircraft intended for the general aviation market. The aircraft was usually powered by Lycoming engines and was also license-built in some countries in Latin America.

PA-31: 2 x 310 HP Lycoming TIO-540-A turbocharged piston engines with 3 blade propellers. Corporate twin and commuter aircraft. In service since 1965 (Chieftain since 1973). Commuter and airliner development. Basic for a large series of developments that led to Cheyenne 400LS.

2022年9月30日 · The Piper PA31 Navajo is a twin-engined aircraft built on the orders of William Thomas Piper (the founder of Piper Aircraft). It is aimed at the small-scale cargo market, small feeder airlines, and the corporate class.

PA-31为轻型6座/8座级公务机，动力装置为两台莱卡明活塞发动机，最初以“纳瓦霍人(Navajo)”的名字于1964年9月30日首飞。 该机型逐渐改进，也瞄准了短程小客机和通勤飞机市场。

The first prototype PA-31 made the type's first flight on September 30 1964 and was Piper's largest aircraft to be built to that time. Deliveries began began in the first half of 1967. The first model was the PA-31-310, powered by two 230kW (310hp) turbocharged Lycoming TIO …

2001年3月7日 · In the mid-1960s Piper, flush with success, decided it was time to enter the burgeoning commuter airline/cabin-class twin market with a brand-new airplane. The result was the PA-31 Navajo, Pipers answer to the ubiquitous Cessna 400 series twins.

2009年6月1日 · The Chieftain's super-stretched 18-foot cabin allows it to perform as either an executive transport or light airliner. Powered by 350-hp Lycomings, it offers seating for six in an executive configuration or up to 10 in a commuter configuration. This latter aircraft was initially introduced as simply the PA-31-350 in 1973.

PA-31-350 Chieftain improved, stretched version for 9 passengers with more powerful counter rotating engines. Production of the Navajo ceased in 1983 (1800 aircraft built) and of the Chieftain in 1984 (1825 aircraft built).