Pratt & Whitney PW4000

The Pratt & Whitney PW4000 is a family of dual-spool, axial-flow, high-bypass turbofan engines that succeeded the JT9D, with thrust ranging from 50,000 to 99,040 pounds-force. It first ran in April 1984, received FAA certification in July 1986 and was introduced in June 1987. Different fan sizes suit different aircraft: the 94 inch version powers the Airbus A300-600 and A310-300, Boeing 747-400 and 767 and the McDonnell Douglas MD-11, a 100 inch version was developed for the Airbus A330, and the 112 inch version, the launch engine of the Boeing 777, entered service on 7 June 1995 with United Airlines. More than 2,500 engines were delivered between 1987 and 2017.