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Lycoming ALF 502
High bypass turbofan aircraft engine
ALF 502/LF 507
ALF 502 removed from a Bombardier Challenger 600-1A11
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:
ALF502R-3 (single-stage LP compressor)
ALF502R-4: R-3 with higher thrust
ALF502R-5: R-4 with improved first-stage and second-stage turbine nozzle assemblies
ALF502R-3A: R-3 with gas producer turbine improvements, but operated at higher thrust
ALF502L (two-stage LP compressor)
ALF502L-2: L with fan blade modification for increased altitude performance
ALF502L-3: L-2 with turbine improvements and automatic power reserve features
ALF502L-2A: L-2 with gas producer turbine improvements and automatic power reserve features
ALF502L-2C: L-2A without automatic power reserve
ALF502R-6: L-2C with R-5 accessory gearbox
LF507-1H: R-6 with lower, flat-rated thrust
LF507-1F: 507-1H with a single-channel FADEC with hydromechanical backup
In 1972, Lycoming and NASA published a study describing the ALF504, a 12.5 bypass ratio engine producing 8,370 lbf (3,800 kgf; 37.2 kN) of sea-level thrust at a specific fuel consumption of 0.302 lb/(lbf?h) (8.6 g/(kN?s)) and a fan tip diameter of 48.0 in (1,220 mm).
Lycoming announced its LF500 family of turbofans in September 1988, starting with the LF507-1H and LF507-1F, which were certificated in October 1991 and March 1992, respectively. In June 1992, the company outlined improvements to the LF500 family's core, which included a wide-chord fan to move more air, uprated fan gearbox, three-stage power turbine (an increase from two stages), more lighter-weight composite materials, increased diameter in the first three stages of the axial compressor to increase airflow by 17 percent, an improved impeller (centrifugal compressor) with lean-back vanes, a 16-lobe forced exhaust mixer to reduce noise and specific fuel consumption (SFC), an advanced combustor, and a temperature margin increase of 248 °F (120 °C) in the turbine. Lycoming introduced the 500 Series of common core engines of turboprops and turbofans in February 1994 as a derivative of the LF507 to power regional aircraft in the late 1990s. A turboprop version also was planned for the European Future Large Aircraft military transport (which would eventually become the Airbus A400M). AlliedSignal, which took over Lycoming in October 1994, demonstration tested the common core in December; the core was capable of producing 20,000 lbf (89 kN) of thrust. After losing the competition to power the de Havilland Dash 8-400 regional turboprop, AlliedSignal abandoned the common core effort in July 1995.
Common Core engines (LF500 family/Lycoming 500 Series/AlliedSignal AS800)
LF508B2: A 7,900 lbf thrust (35 kN) engine offered for the quad-turbofan powered, 120-seat British Aerospace Regional JetLiner (formerly BAe 146) in 1992
LF509: A 9,000 lbf thrust (40 kN) turbofan engine for the Avro RJ100
LF511D: An 11,000 lbf thrust (49 kN) turbofan with a 43 in diameter (1.09 m) wide-chord fan, a three-stage power turbine, and a three-stage low-pressure booster compressor
LF512 / LF514: Additional turbofan engines of 12,000-14,000 lbf (53-62 kN) thrust, possibly for Avro's proposed 120-seat RJX twin airliner or for a stretched version of the 50-seat Canadair Regional Jet
^ ab"Textron Lycoming studies 9,000 lb-thrust LF509 for 'developed' RJ100". Commuter Regional Airline News. Vol. 12 no. 28. July 18, 1994. p. 2. ISSN1040-5402 – via Gale Research.
^Sweetman, Bill (October 1994). "New power for regionals". Finance, markets & industry. Interavia. Vol. 49 no. 583. Minneapolis, Minnesota, U.S.A. pp. 16-18. ISSN1423-3215. OCLC199793280 – via EBSCOhost.