![]() Certification had been granted on May 3 1972, while the first production aircraft, powered by Pratt and Whitney 462kW/620shp PT6A-28s with three bladed, constant speed, fully feathering Hartzell propellors, first flew on October 22 1973. ![]() Production deliveries were further delayed due to flooding at Piper’s Lock Haven plant in June 1972. The prototype of the Cheyenne flew for the first time on August 29 1969, but Piper had to redesign the flight controls to handle the increased loads on the airframe due to the higher speeds. Although the first Cheyenne was not delivered until mid 1974, work on a turboprop version of the Pressurised Navajo, from which it is derived, dates back almost a decade earlier to the mid 1960s. Information from, rocket route and Wikipedia states that the Piper Cheyenne family of turboprop corporate aircraft is based on the popular Navajo and Chieftain piston twins. Carenado Piper PA-31T Cheyenne Introduction
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