Pratt & Whitney JT9D

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Pratt & Whitney JT9D
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Pratt & Whitney JT9D

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.

[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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