Pratt & Whitney JT3D
| JT3D/TF33 | |
|---|---|
| JT3D-3B on a Royal Australian Air Force Boeing 707 | |
| Type | Turbofan |
| National origin | United States |
| Manufacturer | Pratt & Whitney |
| First run | 1958 |
| Major applications | Boeing 707 Boeing B-52H Stratofortress Boeing KC-135E Stratotanker Douglas DC-8 Lockheed C-141 Starlifter |
| Number built | c. 8,600 |
| Developed from | Pratt & Whitney J57/JT3C |
The Pratt & Whitney JT3D is an early turbofan aircraft engine derived from the Pratt & Whitney JT3C turbojet. It was first run in 1958 and was first flown in 1959 under a B-45 Tornado test aircraft. Over 8,000 JT3Ds were produced between 1959 and 1985. Most JT3D engines still in service today are used on military aircraft, where the engine is referred to by its US military designation of TF33.