The Pratt & Whitney JT8D is a low-bypass (0.96 to 1) turbofan jet engine, introduced by Pratt & Whitney in February 1964 with the inaugural flight of Boeing's 727. It was a modification of the Pratt & Whitney J52 turbojet engine, which powered the US Navy A-6 Intruder attack aircraft. The Volvo RM8 is an afterburning version that was license-built in Sweden for the Saab 37 Viggen fighter. A "fixed" version for powerplant and ship propulsion is known as the FT12.

Design and development
The JT8D is an axial-flow front turbofan engine incorporating dual-spool design. Eight models comprise the JT8D standard engine family, covering the thrust range from 12,250 to 17,400 pounds-force (62 to 77kN) and power 727, 737-100/200, and DC-9 aircraft. More than 14,000 JT8D engines have been produced, totaling more than one-half billion hours of service with more than 350 operators making it the most popular of all low-bypass turbofan engines ever produced. The Kawasaki C-1, a Japanese military transport, is powered by the JT8D-M-9, manufactured by Mitsubishi.

- JT8D-9A
- JT8D-5
- JT8D-7
- JT8D-S
- JT8D-9
- JT8D-9A
- JT8D-11
- JT8D-15
- JT8D-17
- JT8D-17R

Jet engine overhaul

Jet engine maintenance