Pratt & Whitney JT9D
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The Pratt & Whitney JT9D engine was the first high bypass ratio jet engine to power a wide-body aircraft. Its first initial application was the Boeing 747-100, the original "Jumbo Jet". As Pratt & Whitney's first high-bypass-ratio turbofan, it introduced many advanced technologies in the areas of structures, aerodynamics and materials to maximize fuel efficiency and component durability.
Today, the JT9D family of engines consists of three distinct series. The JT9D-7 engine covers the 46,300- to 50,000-pound-thrust range, and the JT9D-7Q series has a 53,000 pound thrust rating. Later models, the -7R4 series, cover the 48,000- to 56,000-pound-thrust range. These three engine types power 747, 767, A300, A310 and DC-10 aircraft. For JT9D-7R4 twinjet installations, the engines are approved for 180-minute ETOPS (Extended-range Twin-engine Operations).
Although production ended in 1990, Pratt & Whitney continues to support the JT9D family. Upgrade programs are in place to enable operators to improve durability, increase thrust and reduce noise. With Pratt & Whitney's commitment to the JT9D program, these engines will continue to serve commercial aviation well into the 21st century.
Pratt & Whitney's designated successor to the JT9D family is the PW4000, which features fewer parts, greater reliability, and lower base selling price.
Engine Characteristics Fan tip diameter: 93.4 in Length, flange to flange: 132.7 in Takeoff thrust: 48,000 - 56,000 lb Flat rated temperature: 86° F Bypass ratio: 0.36 Overall pressure ratio: 26.7 Fan pressure ratio: 1.67
[edit] Leading Particulars
| JT9D Engine Family | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| JT9D-3A | JT9D-7 | JT9D-20 | JT9D-7Q/7Q3 | JT9D-59A/70A | JT9D-7R4D/D1 | JT9D-7R4H1 | ||||||||
| Static Thrust (lbf) | 45800 | 47900 | 49400 | 53000 | 53000 | 48000 | 56000 | |||||||
| Basic Engine Weight (lb) | 8608 | 8850 | 8450 | 9295 | 9155 | 8905 | 8885 | |||||||
| Length (in) | 128.2 | 128.2 | 128.2 | 132.1 | 132.2 | 132.7 | 132.7 | |||||||
| Fan Diameter (in) | 92.3 | 92.3 | 92.3 | 93.6 | 93.6 | 93.4 | 93.4 | |||||||
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