Overview:
The Pratt & Whitney PW4000 is a family of dual-spool, axial-flow, high-bypass turbofan aircraft engines produced by Pratt & Whitney as the successor to the JT9D. It was first run in April 1984, was FAA certified in July 1986, and was introduced in June 1987. With thrust ranging from 50,000 to 99,040 lbf (222 to 441 kN), it is used on many wide-body aircraft like the Airbus A300-600, A310-300, Boeing 747-400, 767-200/300, and McDonnell Douglas MD-11. In 2000, over 2,000 PW4000 engines had accumulated over 40 million hours of service with 75 operators. In 30 years between June 1987 and 2017, more than 2,500 engines have been delivered, logging more than 135 million flight hours. The average PW4000 engine stays on wing 13,500 flight hours before a shop visit.

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Like other modern aircraft power plants, it has a Full Authority Digital Engine Control (FADEC), for better fuel economy and reliability. Furthermore, single-crystal alloys allows higher temperature capability and PW's Floatwall combustor liners improve durability and maintainability. Also, the Talon ("Technology for Affordable Low NOx") single-row combustor improves fuel-air mixing, for over 10% better NOx, CO, and HC emissions.

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The PW4000 series engine family uses a numbering systematic with the last three digits (PW 4XYZ) as identification of the application and thrust power: X describes the aircraft manufacturer for which the engine is approved. A "0" stands for Boeing; "1" for Airbus; and "4" for the McDonnell Douglas MD-11. YZ denotes the certified thrust in US pounds (lbf) in pro-mile fraction. Example: A PW4090 identifies a PW4000 series engine certified for Boeing (777-200ER) and has a certified thrust of 90,000 lbf.

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The PW4098 variant specifically wasn't as desirable as previous versions since the PW4000 core was being pushed to its limits. Unlike the GE90 engine, which was designed for high-powered thrust to start with, and the Rolls-Royce Trent 800, which had demonstrated over 104,000-115,000 lbs. of thrust.

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Our Example:
This engine powered a Korean Air Lines Boeing 777-300 aircraft before being retired and donated by Pratt & Whitney.