The Pratt & Whitney Canada PT6 is a turboprop aircraft engine produced by Pratt & Whitney Canada.
Its development began in 1958, it was first run in February 1960, first flew on 30 May 1961, entered service in 1964 and has been continuously updated since.
It consists of two sections: a gas generator supplying hot gas to a free power turbine, and is often mounted backwards with the intake at the rear and the exhaust on the sides.
By November 2015, 51,000 had been produced logged 400 million flight hours from 1963 to 2016, it is known for its reliability with an in-flight shutdown rate of 1 per 651,126 hours in 2016.
The PT6A covers the power range between 580 and 1,940 shp while the PT6B/C are turboshaft variants for helicopters.
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