Pratt & Whitney JT9D
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The Pratt & Whitney JT9D engine is the first high-bypass-ratio engine to power a wide-bodied aircraft. Its first initial application is the Boeing 747-100, the original "Jumbo-jet". It is also the first high-bypass turbofan for Pratt & Whitney.
The JT9D family of engines consists of three distinct series. The JT9D-7 engine covers the 46,300 to 50,000 pound-force (206 to 220 kN) thrust range, and the JT9D-7Q series has a 53,000 pound force (236 kN) thrust rating. Later models, the JT9D-7R4 series, cover the 48,000 to 56,000 pound force (214 to 249 kN) thrust range.
These three engine types power 747, 767, A300, A310 and DC-10 aircraft. For JT9D-7R4 installed in A300-600, A310 and 767, the engines are approved for 180-minute ETOPS operation.
The JT9D is the basis for development of its successful successor, the Pratt & Whitney PW4000 which features lower number of parts, greater reliability and lower base selling price.
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