Lycoming ALF 502
| ALF 502/LF 507 | |
|---|---|
 | |
| 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.[1] 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 Honeywell LF 507 was used on the Avro RJ update of the BAe 146.
Variants
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 :[2]
- ALF502R-3 (single-stage supercharger)
- 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 supercharger)
- 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
Applications
- YF102
- ALF 502
- LF 507
Specifications
| Variant | ALF502R-3 | ALF502R-4/5/3A | ALF502L/L-2/L-3/L-2A/L-2C/R-6 | LF507-1H/1F | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Configuration | High bypass turbofan, geared fan | |||||||||||
| Fan diameter | 40.25 in (1,022 mm)[3] | |||||||||||
| Gear ratio | 2.3:1[4] | |||||||||||
| Bypass ratio | 5.7:1 | |||||||||||
| Compressor | 1 LP, 7-stage axial[3] + centrifugal HP | 2 LP, 7-stage axial[3] + centrifugal HP | ||||||||||
| Combustor | reverse flow annular | |||||||||||
| Turbine | two-stage HP, two-stage LP | |||||||||||
| Takeoff thrust | 6,700 lbf (30 kN) | 6,970 lbf (31.0 kN) | 7,500 lbf (33 kN) | 7,000 lbf (31 kN) | ||||||||
| Length | 63.66 in (1,617 mm) | 65.57 in (1,665 mm) | ||||||||||
| Height | 55.5 in (1,410 mm) | 54.5 in (1,380 mm) | ||||||||||
| Width | 47.8 in (1,210 mm) | 48.6 in (1,230 mm) | ||||||||||
| Weight [lower-alpha 1] | 1,336 lb (606 kg) | 1,375 lb (624 kg) (1F: 1,385 lb (628 kg)) | ||||||||||
| LP RPM | 7,184 - 7,374 | |||||||||||
| HP RPM | 19,280 - 19,760 | |||||||||||
| TSFC | 0.406 lb/lbf (41.4 kg/kN)/h[3] | |||||||||||
| Thrust/weight | 5.01 | 5.22 | 5.45 | 5.09 | ||||||||
See also
- Comparable engines
- Garrett TFE731
- Pratt & Whitney PW1000G
- Turbomeca Aspin/Astafan
- IAE SuperFan
- Rolls-Royce/SNECMA M45SD
- Related lists
Notes
- ↑ includes essential engine accessories but excludes starter, hydraulic pump, integrated drive generator and exhaust nozzle
References
- ↑ 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 1-56347-332-1.
- 1 2 "Type Certificate Data Sheet E6NE" (PDF). FAA. June 7, 2002.
- 1 2 3 4 "ALF 502 Turbofan Engine -Honeywell Aerospace". November 29, 2010. Archived from the original on March 5, 2012.
- ↑ Graham Warwick (25 August 1993). "Engine for Change". Flight International.
External links
 |
Wikimedia Commons has media related to Lycoming ALF 502. |
- Honeywell propulsion products page
- Technical details from Swiss International Air Lines
- Dale Raunch (July 1972). "Design study of an air pump and integral lift engine ALF-504 using the Lycoming 502 core" (PDF). NASA.