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The Pratt & Whitney Canada PT6 is a turboprop aircraft engine produced by Pratt & Whitney Canada.Its design was started in 1958, it first ran in February 1960, first flew on 30 May 1961, entered service in 1964, and has been continuously updated since.
The 715 shp TPE331-6 used in the Beech King Air B100 have a 400-hr. fuel nozzle cleaning interval, 1,800-hr. hot section inspection interval and a 5,400-hr. time between overhaul; approval is possible for 3,000-hr. HSIs and 6,000-hr. overhauls and engine reserves are cheaper than for the PT6A.
The availability of the 550 shaft horsepower (410 kW) Pratt & Whitney Canada PT6A-20 turboprop in the early 1960s made the concept of a twin feasible. A DHC-3 Otter with its piston engine replaced with two PT6A-4 [3] engines had already flown in 1963. It had been extensively modified for STOL research. [4]
Time between overhauls (abbreviated as TBO or TBOH) is the manufacturer's recommended number of running hours or calendar time before an aircraft engine or other component requires overhaul. [1] On rotorcraft, many components have recommended or mandatory TBOs, including main rotor blades, tail rotor blades and gearboxes. [2]
Model 90 with TOGW increased to 9300lb, two 550shp PT6A-20 engines, redesigned flightdeck and a new engine de-ice system, 206 built. [49] Model 65-A90-1 Based on the Model 87, unpressurised with square windows and 550shp PT6A-20 engines, 141 built and delivered to the US Army with the designation U-21A. [49] Model 65-A90-2
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Data from Jane's All the World's Aircraft 1976–77 General characteristics Crew: 2 Capacity: 4–6 passengers Length: 34 ft 8 in (10.57 m) Wingspan: 42 ft 8 + 1 ⁄ 4 in (13.011 m) (over tip tanks) Height: 12 ft 9 in (3.89 m) Wing area: 229 sq ft (21.3 m 2) Airfoil: NACA 63 2 -415 at root, 63A212 at tip Empty weight: 4,870 lb (2,209 kg) Max takeoff weight: 9,000 lb (4,082 kg) Fuel capacity ...
The PA-42-1000 Cheyenne IV was certified in 1984, 43 were built until 1991 and 37 remain in service in 2018. [3] Due to its top speed over 351 kn (404 mph; 650 km/h) it was renamed the Cheyenne 400LS when Lear Siegler owned Piper, then the Cheyenne 400. [3] Flat rated to ISA+37, the turboprops maintains its power to almost 20,000 ft (6,100 m).