Pratt & Whitney J75
| J75 / JT4A | |
|---|---|
| Two JT4As installed on a KLM DC-8 with hush kits installed. | |
| Type | Turbojet |
| National origin | United States |
| Manufacturer | Pratt & Whitney |
| First run | 1955 |
| Major applications | Boeing 707 Convair F-106 Delta Dart Douglas DC-8 Lockheed U-2 Republic F-105 Thunderchief |
| Developed from | Pratt & Whitney J57 |
| Developed into | Pratt & Whitney FT4 |
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The Pratt & Whitney J75 (civilian designation: JT4A) is an axial-flow turbojet engine first flown in 1955. A two-spool design in the 17,000 lbf (76 kN) thrust class, the J75 was essentially the bigger brother of the Pratt & Whitney J57 (JT3C). It was known in civilian service as the JT4A, and in a variety of stationary roles as the FT4.