Lycoming ALF 502

59187The Lycoming ALF 502 is a geared turbofan engine produced by Lycoming, AlliedSignal and then Honeywell Aerospace.

The Lycoming Turbine Engine Division in Stratford, Connecticut developed the original YF102 by adding a fan to the Lycoming T55 engine, which was used as the gas generator. In 1980 the ALF 502 was certified for use 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.

Six of the prototype, YF102’s were used for the Northrop YA-9 program in 1971. The YA-9 was a prototype attack aircraft developed for the United States Air Force A-X program. The YA-9 was passed over in preference for the Fairchild Republic YA-10 that entered production as the A-10 Thunderbolt II.  After the program was over these engines were reused in the C-8A Quiet Short-Haul Research Aircraft (QSRA). Both YA-9’s still survive in museums on the west coast, one of which, 71-1368 is on public display at March Field Air Museum, March Air Reserve Base, California.

General Specifications
Type: High bypass geared turbofan
Length: 63.6 inches
Diameter: Fan: 40.25 inches
Dry weight: 1336 pounds

Components
Compressor: Single stage fan, single stage axial low pressure compressor, 7 stage axial and single stage centrifugal high pressure compressor
Combustors: Annular
Turbine: Two stage high pressure turbine, two stage low pressure turbine

AVCO-MIT_0003_Layer 6

AVCO-Lycoming ALF502 turbofan which was installed on a Bombardier Challenger 600-1A11. Taken in Oberpfaffenhofen. Photo by SOVXX

Performance
Maximum thrust: 6,970 lbf
Bypass ratio: 5.7:1
Specific fuel consumption: 0.406 lb/lbf-h
Thrust-to-weight ratio: 5.1:1

Our museum would like at acquire an ALF 502  for display. Please contact casc@ctairandspace.org if you could help us make this happen. 

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