Pratt & Whitney Canada PT6-67A
| PT6 | |
|---|---|
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|
| A PT6A-20 on display at the Canada Aviation and Space Museum | |
| Type | Turboprop / turboshaft |
| National origin | Canada |
| Manufacturer | Pratt & Whitney Canada |
| First run | 1960 |
| Major applications |
Beechcraft Super King Air de Havilland Canada DHC-6 Twin Otter Pilatus PC-12 Sikorsky S-76 |
| Number built | 51,000 (as of November 2015) |
| Unit cost | 750 hp -135A: $560,000; 1,050 hp PT6A-60A: $955,000; 1,100 hp PT6A-68: $855,000 |
| Variants | Pratt & Whitney Canada PT6T |
The Pratt & Whitney Canada PT6, produced by Pratt & Whitney Canada, is a turboprop aircraft engine. Its development began in 1958, it was first run in February 1960, first flew on 30 May 1961, entered service in 1964 and is continuously updated since. It consist 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. Till November 2015, 51,000 have been produced and they 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 (430 and 1,450 kW) while the PT6B/C are turboshaft variants for helicopters.
In 1956, PWC's President, Ronald Riley, foreseeing the need for engines with much higher power-to-weight ratio, ordered engineering manager Dick Guthrie to establish a development group to create a turboprop engine designed to replace piston engines. Demand for the Wasp radial engine was still strong and its production line's output was robust and profitable. Riley gave Guthrie a modest budget of C$100,000. Guthrie recruited young engineers from the National Research Council in Ottawa and from Orenda Engines in Ontario. In 1958, the group began development of a turboprop engine intended to deliver 450 shaft horsepower. The first engine was powered up and run successfully in February 1960. It first flew on 30 May 1961, mounted on a Beech 18 aircraft at de Havilland Canada's Downsview, Ontario facility. Full-scale production started in 1963, entering service the next year.
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