Lycoming ALF 502

ALF 502
ALF 502 removed from a Bombardier Challenger 600-1A11
Type	Geared turbofan
National origin	United States
Manufacturer	Lycoming Engines Honeywell Aerospace
First run	1980
Major applications	Bombardier Challenger 600 British Aerospace 146 Northrop YA-9
Developed into	Honeywell LF 507

The Lycoming ALF 502 is a geared turbofan engine produced by Lycoming, AlliedSignal and then Honeywell Aerospace.

The original YF102 was developed at the Lycoming Turbine Engine Division in Stratford, Connecticut by adding a fan to the Lycoming T55 engine, which was used as the gas generator. Six engines were built for the Northrop YA-9 prototype ground-attack aircraft. These engines were later reused in the C-8A Quiet Short-Haul Research Aircraft (QSRA).

The ALF 502 was certified in 1980, and used on the British Aerospace 146 and Bombardier Challenger 600. The improved, higher-thrust LF 507 was used on the Avro RJ update of the BAe 146.

The ALF502 is a high bypass turbofan with geared fan, axial-centrifugal flow high pressure compressor, reverse flow annular combustor, two-stage high pressure turbine, two-stage low pressure turbine :

Leyes, Richard A., II; William A. Fleming (1999). The History of North American Small Gas Turbine Aircraft Engines. Reston, VA: American Institute of Aeronautics and Astronautics. ISBN . 

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