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Pratt & Whitney began developing its first production turbofan—the JT3D—during the late 1950s.

It was a low-bypass-ratio engine built around the J57's service-proven core. The JT3 made its first flight on a Boeing 707-120 aircraft on June 22, 1960. Shortly thereafter, McDonnell Douglas selected it for versions of the DC-8.

The military version of the JT3D—the TF33—powered the first flight of the Air Force's B-52H Stratofortress on March 6, 1961. The Air Force also used it for transports such as the Lockheed C-141 Starlifter and Boeing C-135B Stratolifter. In 1973, the Air Force selected a TF33 model for its E3A Airborne Warning and Control System (AWACS) airplane manufactured by Boeing.


  • First flight: 1958
  • Production years: 1959-1985
  • Engines produced: ~8,600

Airplanes Powered

  • Boeing 707-120B
  • Boeing 707-320B,C
  • Boeing 707-323C
  • McDonnell Douglas DC-8-50
  • McDonnell Douglas DC-8-60
  • McDonnell Douglas DC-8F
  • Boeing B-52H
  • Convair RB-57F
  • Boeing C-135B
  • Boeing KC-135B
  • Lockheed C-141A
  • Boeing VC-137B, C