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. The YF102-LD-100 was tested on an AJ Savage in the early 1970s. 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 geared turbofan 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.
Applications:
YF102 Northrop YA-9 C-8A Quiet Short-Haul Research Aircraft (QSRA)
ALF 502 Bombardier Challenger 600 British Aerospace 146
LF 507 Avro RJ
Specifications:
ALF502-R5 Type: High bypass geared turbofan Length: 63.6 in (162 cm) Diameter: Fan: 40.25 in (102 cm) Dry weight: 1336 lb (606 kg) 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 Maximum thrust: 6,970 lbf (31 kN) Bypass ratio: 5.7:1 Specific fuel consumption: 0.406 lb/lbf-h (41.4 kg/kN-hr) Thrust-to-weight ratio: 5.1:1