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