# Lycoming ALF 502

> Mediated Wiki article. Canonical URL: https://mediated.wiki/source/Lycoming_ALF_502
> Markdown URL: https://mediated.wiki/source/Lycoming_ALF_502.md
> Source: https://en.wikipedia.org/wiki/Lycoming_ALF_502
> Source revision: 1321532321
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

High-bypass turbofan aircraft engine

This article is about the American turbofan engine. For the Chinese rocket engine, see [YF-102 (rocket engine)](/source/YF-102_(rocket_engine)).

ALF 502/LF 507 ALF 502 removed from a Bombardier Challenger 600-1A11 Type Geared turbofan National origin United States Manufacturer Lycoming AlliedSignal Honeywell Aerospace First run June 1971[1]: 191 Major applications Bombardier Challenger 600 British Aerospace 146 Northrop YA-9 Number built 1,843 Developed from Lycoming T55

The YF102-LD-100 was tested on an [AJ Savage](/source/North_American_AJ_Savage) in the early 1970s.

The **Lycoming ALF 502/LF 507** (later **Honeywell ALF 502/LF 507**) is a [geared turbofan](/source/Geared_turbofan) [engine](/source/Aircraft_engine) produced by [Lycoming Engines](/source/Lycoming_Engines), [AlliedSignal](/source/AlliedSignal), and [Honeywell Aerospace](/source/Honeywell_Aerospace). The U.S. military designation for the ALF 502 is **YF102**.

## Development

In mid-1970, [Avco](/source/Avco) [Lycoming](/source/Lycoming_Engines) was advertising two [Lycoming T55](/source/Lycoming_T55)-derived engines, an LTC4B-12 turboprop and an ALF 502A turbofan, as possible powerplants for the [U.S. Air Force](/source/U.S._Air_Force)'s [A-X](/source/A-X) [close air support](/source/Close_air_support) aircraft program.[2] [Northrop Corporation](/source/Northrop_Corporation) signed a contract with Avco Lycoming to use the ALF 502A for its entry into the A-X competition, the [Northrop YA-9](/source/Northrop_YA-9), in January 1971. The engine was given a [United States military aircraft engine designation](/source/United_States_military_aircraft_engine_designation) of YF102-LD-100.[1]: 190 Six YF102 engines were built for the YA-9. The 7,500 lbf (33 kN) thrust engines powered the A-9A prototypes for seven months of [flight tests](/source/Flight_test) in 1972, recording 238 flights and 652 flight hours.[3] These engines were later reused in the [C-8A Quiet Short-Haul Research Aircraft](/source/C-8A_Quiet_Short-Haul_Research_Aircraft) (QSRA).

The commercial ALF 502D engine was developed from the military YF102 in 1971. Its 6,500 lbf (29 kN) derated engine had just one booster compressor stage instead of the YF102's two stages, and operated under a lower turbine temperature to improve reliability. The ALF 502D powered the [Dassault Falcon 30](/source/Dassault_Falcon_30) prototype from May 1973 into 1975, logging 270 flight hours until Dassault discontinued development of the aircraft model. The ALF 502D was also chosen for the [LearStar 600](/source/LearStar_600) executive transport aircraft, which eventually became the [Canadair CL-600 Challenger](/source/Canadair_CL-600_Challenger). The CL-600 Challenger first flew in November 1978 and was powered by the 7,500 lbf (33 kN) ALF 502L-2, ALF 502L-2A, and ALF 502L-3 variants. The 6,700 lbf (30 kN) ALF 502R-3 variant initially powered the quad-engine [British Aerospace 146](/source/British_Aerospace_146), which entered service in 1983 and became the ALF 502's biggest customer. A total of 1,019 ALF 502 engines of all variants were produced. The LF 507 series based on the ALF 502R was announced in September 1988. The series initially consisted of the hydromechanically controlled LF 507-1H and the [FADEC](/source/FADEC)-controlled LF 507-1F, both offering 7,000 lbf (31 kN) of thrust. Both variants were used on the Avro RJ update of the BAe 146, and the LF 507-1F was also used on the BAe 146.[1]: 192–199, 203 818 LF 507 engines were produced.[4]

In 2020, Honeywell sold the type certificate to CFS Aeroproducts Inc. (Arizona), a subsidiary of [MRO provider](/source/Aircraft_maintenance) CFS Aeroproducts Ltd (UK), then transferred in January 2021.[5]

### Proposed variants

In 1972, Lycoming and [NASA](/source/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](/source/Thrust-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).[6]

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.[1]: 198 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](/source/Gearbox), three-stage power [turbine](/source/Turbine) (an increase from two stages), more lighter-weight [composite materials](/source/Composite_materials), increased diameter in the first three stages of the [axial compressor](/source/Axial_compressor) to increase airflow by 17 percent, an improved [impeller](/source/Impeller) (centrifugal compressor) with lean-back vanes, a 16-lobe forced [exhaust mixer](/source/Exhaust_mixer) to reduce noise and specific fuel consumption (SFC), an advanced [combustor](/source/Combustor), and a temperature margin increase of 248 °F (120 °C) in the turbine.[7] Lycoming introduced the 500 Series of common core engines of [turboprops](/source/Turboprops) and turbofans in February 1994 as a derivative of the LF507 to power regional aircraft in the late 1990s.[1]: 198, 199, 200 A turboprop version also was planned for the European [Future Large Aircraft](/source/Future_Large_Aircraft) military transport (which would eventually become the [Airbus A400M](/source/Airbus_A400M)). AlliedSignal, which took over Lycoming in October 1994,[8] demonstration tested the common core in December; the core was capable of producing 20,000 lbf (89 kN) of [thrust](/source/Thrust).[9] After losing the competition to power the [de Havilland Dash 8](/source/De_Havilland_Dash_8)-400 regional turboprop, AlliedSignal abandoned the common core effort in July 1995.[10]

## Design

Honeywell ALF 502 on an early [Challenger 600](/source/Challenger_600)

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.[11]

## Variants

**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

### Proposed 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](/source/BAe_146)) in 1992[7]

- LF509: A 9,000 lbf thrust (40 kN) turbofan engine for the [Avro RJ100](/source/Avro_RJ100)[12]

- 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[7]

- LF512 / LF514: Additional turbofan engines of 12,000–14,000 lbf (53–62 kN) thrust, possibly for [Avro](/source/Avro)'s proposed 120-seat RJX twin airliner or for a stretched version of the 50-seat [Canadair Regional Jet](/source/Canadair_Regional_Jet)[12]

- LF518: An 18,000 lbf (80 kN) turbofan variant.[13]

- LP512: Turboprop engines targeted for the [de Havilland Dash 8](/source/De_Havilland_Dash_8)-400 and the proposed [ATR 82](/source/ATR_72), having an initial power output of 7,500 shp (5,600 kW) but with uprate capability to 11,000 shp (8,200 kW)[1]: 200

## Applications

Lycoming LF 507s on a [Brussels Airlines](/source/Brussels_Airlines) [British Aerospace 146](/source/British_Aerospace_146).

**YF102**

- [Northrop YA-9](/source/Northrop_YA-9)

- [C-8A Quiet Short-Haul Research Aircraft](/source/C-8A_Quiet_Short-Haul_Research_Aircraft)

**ALF 502**

- [Bombardier Challenger 600](/source/Bombardier_Challenger_600): early CL-600 (1A11) series, 81 built from 1978 to 1982

- [British Aerospace 146](/source/British_Aerospace_146)

- [Dassault Falcon 30](/source/Dassault_Falcon_30) (prototype)

**LF 507**

- [Avro RJ](/source/Avro_RJ)

- [British Aerospace 146](/source/British_Aerospace_146)

- [Yakovlev Yak-40](/source/Yakovlev_Yak-40)TL (proposed reengine)[14]

## Specifications

Type Certificate Data Sheet[11] Variant ALF502R-3 ALF502R-4/5/3A ALF502L/L-2/L-3/L-2A/L-2C/R-6 LF507-1H/1F Configuration High bypass, geared fan Fan diameter 40.25 in (1,022 mm)[15] Gear ratio 2.3:1[16] Bypass ratio 5.7:1 Compressor 1 LP, 7-stage axial[15] + centrifugal HP 2 LP, 7-stage axial[15] + 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 [a] 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 (SLS ISA) 0.406 lb/(lbf⋅h) (11.5 g/(kN⋅s))[15] Thrust/weight 5.01 5.22 5.45 5.09

## See also

**Related development**

- [Lycoming T55](/source/Lycoming_T55)

- [Honeywell HTF7000](/source/Honeywell_HTF7000) (AS907), ALF502/LF507 successor

**Comparable engines**

- [GE CF34](/source/GE_CF34)

- [Pratt & Whitney Canada PW300](/source/Pratt_%26_Whitney_Canada_PW300)

- [Rolls-Royce AE 3007](/source/Rolls-Royce_AE_3007)

**Geared turbofans**

- [Garrett TFE731](/source/Garrett_TFE731)

- [Turbomeca Aspin](/source/Turbomeca_Aspin)/[Astafan](/source/Turbomeca_Astafan)

- [Rolls-Royce/SNECMA M45SD](/source/Rolls-Royce%2FSNECMA_M45H)

**Related lists**

- [List of aircraft engines](/source/List_of_aircraft_engines)

## Notes

1. **[^](#cite_ref-17)** includes essential engine accessories but excludes starter, hydraulic pump, integrated drive generator and exhaust nozzle

## References

1. ^ [***a***](#cite_ref-LeyesFleming_1-0) [***b***](#cite_ref-LeyesFleming_1-1) [***c***](#cite_ref-LeyesFleming_1-2) [***d***](#cite_ref-LeyesFleming_1-3) [***e***](#cite_ref-LeyesFleming_1-4) [***f***](#cite_ref-LeyesFleming_1-5) Leyes, Richard A., II; Fleming, William A. (1999). [*The history of North American small gas turbine aircraft engines*](https://books.google.com/books?id=V0SnFt8JGokC&pg=frontcover). Reston, VA: [National Air and Space Museum](/source/National_Air_and_Space_Museum) and [American Institute of Aeronautics and Astronautics](/source/American_Institute_of_Aeronautics_and_Astronautics) (AIAA). [ISBN](/source/ISBN_(identifier)) [1-56347-332-1](https://en.wikipedia.org/wiki/Special:BookSources/1-56347-332-1). [OCLC](/source/OCLC_(identifier)) [247550535](https://search.worldcat.org/oclc/247550535).{{[cite book](https://en.wikipedia.org/wiki/Template:Cite_book)}}: CS1 maint: multiple names: authors list ([link](https://en.wikipedia.org/wiki/Category:CS1_maint:_multiple_names:_authors_list))

1. **[^](#cite_ref-AFM197007_2-0)** [Avco Lycoming Division](/source/Avco_Lycoming) (July 1970). ["Proven power, turbofan or turboprop, for any AX configuration"](https://books.google.com/books?id=w-U9AQAAIAAJ&pg=RA6-PA45). *[Air Force Magazine](/source/Air_Force_Magazine)*. p. 45. [ISSN](/source/ISSN_(identifier)) [0730-6784](https://search.worldcat.org/issn/0730-6784).

1. **[^](#cite_ref-A-9A_3-0)** Anderson, Fred (1976). ["A-X / A-9A close air support aircraft"](https://books.google.com/books?id=-YEEDgAAQBAJ&pg=PA251). *Northrop: An aeronautical history*. Wipf & Stock Publishers. pp. 251–256. [ISBN](/source/ISBN_(identifier)) [9781532601460](https://en.wikipedia.org/wiki/Special:BookSources/9781532601460). [OCLC](/source/OCLC_(identifier)) [980678030](https://search.worldcat.org/oclc/980678030).

1. **[^](#cite_ref-FI20040816_4-0)** Learmount, David; Norris, Guy (August 16, 2004). ["Uncontained failure dogs Honeywell LF507 engine"](https://www.flightglobal.com/uncontained-failure-dogs-honeywell-lf507-engine/56071.article). *[Flight International](/source/Flight_International)*. [ISSN](/source/ISSN_(identifier)) [0015-3710](https://search.worldcat.org/issn/0015-3710). Retrieved January 30, 2022.

1. **[^](#cite_ref-5)** ["CFS Aeroproducts Inc. Chooses ATP as Exclusive Partner for ALF502 and LF507 Series Engine Publications"](https://www.atp.com/cfs-aeroproducts-inc-chooses-atp-as-exclusive-partner-for-alf502-and-lf507-series-engine-publications/) (Press release). ATP. July 27, 2021.

1. **[^](#cite_ref-NASA19730004744_6-0)** Rauch, Dale (July 1972). [Design study of an air pump and integral lift engine ALF-504 using the Lycoming 502 core](https://archive.org/details/NASA_NTRS_Archive_19730004744/page/n0) (Report). [National Aeronautics and Space Administration](/source/National_Aeronautics_and_Space_Administration) (NASA). [hdl](/source/Hdl_(identifier)):[2060/19730004744](https://hdl.handle.net/2060%2F19730004744). [alternate url](https://ntrs.nasa.gov/search.jsp?R=19730004744)

1. ^ [***a***](#cite_ref-FI19920617_7-0) [***b***](#cite_ref-FI19920617_7-1) [***c***](#cite_ref-FI19920617_7-2) Warwick, Graham (June 17, 1992). "Lycoming outlines LF500 power increase". *[Flight International](/source/Flight_International)*. Vol. 141, no. 4323. p. 8. [ISSN](/source/ISSN_(identifier)) [0015-3710](https://search.worldcat.org/issn/0015-3710). [Gale](/source/Gale_(publisher)) [A12271580](https://go.gale.com/ps/anonymous?id=GALE%7CA12271580).

1. **[^](#cite_ref-AW19941107_8-0)** Kandebo, Stanley (November 7, 1994). ["AlliedSignal completes Lycoming acquisition"](https://archive.aviationweek.com/issue/19941107/#!&pid=35). *[Aviation Week & Space Technology](/source/Aviation_Week_%26_Space_Technology)*. Vol. 141, no. 19. p. 35. [ISSN](/source/ISSN_(identifier)) [0005-2175](https://search.worldcat.org/issn/0005-2175).

1. **[^](#cite_ref-CRAN19941226_9-0)** "AlliedSignal runs demo test on former Lycoming 'Common Core' engine". *Commuter Regional Airline News*. Vol. 12, no. 50. December 26, 1994. pp. 6+. [ISSN](/source/ISSN_(identifier)) [1040-5402](https://search.worldcat.org/issn/1040-5402). [Gale](/source/Gale_(publisher)) [A16362047](https://go.gale.com/ps/anonymous?id=GALE%7CA16362047).

1. **[^](#cite_ref-FG19950711_10-0)** ["AlliedSignal plans turbine closure"](https://www.flightglobal.com/alliedsignal-plans-turbine-closure/15488.article). *[FlightGlobal](/source/FlightGlobal)*. July 11, 1995. Retrieved July 16, 2020.

1. ^ [***a***](#cite_ref-TCDS_11-0) [***b***](#cite_ref-TCDS_11-1) ["Type certificate data sheet E6NE"](https://web.archive.org/web/20220419142043/https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgMakeModel.nsf/0/3f30606514a3b28086256bea006c249c/%24FILE/e6ne.pdf) (PDF) (15th ed.). Department of Transportation, [Federal Aviation Administration](/source/Federal_Aviation_Administration) (FAA). June 7, 2002. Archived from [the original](https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgMakeModel.nsf/0/3f30606514a3b28086256bea006c249c/$FILE/e6ne.pdf) (PDF) on April 19, 2022. Retrieved July 25, 2020.

1. ^ [***a***](#cite_ref-CRAN19940718_12-0) [***b***](#cite_ref-CRAN19940718_12-1) "Textron Lycoming studies 9,000 lb-thrust LF509 for 'developed' RJ100". *Commuter Regional Airline News*. Vol. 12, no. 28. July 18, 1994. p. 2. [ISSN](/source/ISSN_(identifier)) [1040-5402](https://search.worldcat.org/issn/1040-5402). [Gale](/source/Gale_(publisher)) [A15618034](https://go.gale.com/ps/anonymous?id=GALE%7CA15618034).

1. **[^](#cite_ref-Interavia199410p16_13-0)** Sweetman, Bill (October 1994). "New power for regionals". Finance, markets & industry. *[Interavia](/source/Interavia_(magazine))*. Vol. 49, no. 583. Minneapolis, Minnesota, U.S.A. pp. 16–18. [ISSN](/source/ISSN_(identifier)) [1423-3215](https://search.worldcat.org/issn/1423-3215). [OCLC](/source/OCLC_(identifier)) [199793280](https://search.worldcat.org/oclc/199793280).

1. **[^](#cite_ref-ATW199210_14-0)** Donoghue, J.A.; Moorman, Robert W.; Reed, Arthur; Woolsey, James P. (October 1992). "Russian deals at Farnborough". *[Air Transport World](/source/Air_Transport_World)*. Vol. 29, no. 10. pp. 36+. [ISSN](/source/ISSN_(identifier)) [0002-2543](https://search.worldcat.org/issn/0002-2543). [Gale](/source/Gale_(publisher)) [A12736619](https://go.gale.com/ps/anonymous?id=GALE%7CA12736619).

1. ^ [***a***](#cite_ref-specs_15-0) [***b***](#cite_ref-specs_15-1) [***c***](#cite_ref-specs_15-2) [***d***](#cite_ref-specs_15-3) ["ALF 502 turbofan engine"](https://web.archive.org/web/20120305232900/http://www.honeywell.com/sites/portal?smap=aerospace&page=Propulsion_Engines3&theme=T5&catID=CDAB5CA0F-004C-6DBB-B50C-20859E156C16&id=H8D86112E-572B-E3ED-33CB-C2D8ED91628F&sel=1g). *[Honeywell Aerospace](/source/Honeywell_Aerospace)*. November 29, 2010. Archived from [the original](http://www.honeywell.com/sites/portal?smap=aerospace&page=Propulsion_Engines3&theme=T5&catID=CDAB5CA0F-004C-6DBB-B50C-20859E156C16&id=H8D86112E-572B-E3ED-33CB-C2D8ED91628F&sel=1g) on March 5, 2012.

1. **[^](#cite_ref-FI19930825_16-0)** Warwick, Graham (25 August 1993). ["Engine for change"](https://www.flightglobal.com/pdfarchive/view/1993/1993%20-%202096.html). *[Flight International](/source/Flight_International)*. Vol. 144, no. 4384. pp. 39+. [ISSN](/source/ISSN_(identifier)) [0015-3710](https://search.worldcat.org/issn/0015-3710). [Gale](/source/Gale_(publisher)) [A14335274](https://go.gale.com/ps/anonymous?id=GALE%7CA14335274).

## Further reading

- Whitaker, Richard (January 30, 1982). ["ALF502: Plugging the turbofan gap"](https://web.archive.org/web/20221231004242/https://ptacts.uspto.gov/ptacts/public-informations/petitions/1516455/download-documents?artifactId=169822875). *[Flight International](/source/Flight_International)*. Cutaway by Frank Munger. pp. 237–241. [ISSN](/source/ISSN_(identifier)) [0015-3710](https://search.worldcat.org/issn/0015-3710). Archived from [the original](https://ptacts.uspto.gov/ptacts/public-informations/petitions/1516455/download-documents?artifactId=169822875) on December 31, 2022. Retrieved December 30, 2022.

- [*The ALF 502R turbofan: Technology, ecology, economy*](https://web.archive.org/web/20221231010815/https://ptacts.uspto.gov/ptacts/public-informations/petitions/1485234/download-documents?artifactId=169514603). *Avco Lycoming Textron* (brochure). Archived from [the original](https://ptacts.uspto.gov/ptacts/public-informations/petitions/1485234/download-documents?artifactId=169514603) on December 31, 2022. Retrieved December 30, 2022.

## External links

Wikimedia Commons has media related to [Lycoming ALF 502](https://commons.wikimedia.org/wiki/Category:Lycoming_ALF_502).

- [Honeywell propulsion products page](https://web.archive.org/web/20080216183330/http://www.honeywell.com/sites/aero/Propulsion_Engines.htm)

- [Technical details from Swiss International Air Lines](https://web.archive.org/web/20080517224926/http://www.swiss-technical-services.com/tsindex/print/pr-honeywell-alf_502_507-technical-details)

v t e Lycoming aircraft engines Opposed piston engines O-145 O-233 IO-233 O-235 O-290 O-320 O-340 O-360 (O-360 variants) IO-390 O-435 O-480 O-540 TIO-541 GSO-580 IO-580 IO-720 O-1230 Radial engines and H engines R-680 XR-7755 XH-2470 Aircraft diesel engines DEL-120 Turbofans PLF1 ALF 502/YF102 LF 507 Turboprops/Turboshafts AGT1500 LTS101/LTP101 T53 T55 Aero-derivative marine gas turbines TF-40 Joint development Avco (Lycoming)/Pratt & Whitney: T800-APW (Turboshaft) See also AlliedSignal Aerospace/Honeywell Aerospace

v t e Garrett/AlliedSignal/Honeywell aircraft engines Turboprops/Turboshafts AGT1500* HTS900 LTS101/LTP101* T53* T55* TPE331 TPF351 Turbofans ALF 502/LF507* ATF3 F109 FX5 HTF7000 (AS907) TFE731 Joint development CFE Company: CFE738 (Turbofan) GE/Honeywell: LV100 (Turboshaft) ITEC: F124/TFE1042 F125 (Turbofans) LHTEC: CTS800 (Turboshaft) ATEC: T900 (Turboshaft) Note: AVCO Lycoming/Textron Lycoming engines marked with *

v t e United States military gas turbine aircraft engine designation system Turbojets J30 J31 J32 J33 J34 J35 J36 J37 XJ38 J39 J40 XJ41 J42 J43 J44 J45 J46 J47 J48 XJ49 J51 J52 J53 J54 J55 J56 J57 J58 J59 J60 J61 J63 J65 J67 J69 J71 J73 J75 J79 J81 J83 J85 J87 J89 J91 YJ93 J95 J97 J99 J100 YJ101 J102 J400 J401 J402 J403 J700 Turboprops/ Turboshafts T30 T31 T33 T34 T35 T36 T37 T38 T39 T40 T41 T42 T43 T44 T45 T46 T47 T48 T49 T50 T51 T52 T53 T54 T55 T56 (variants) T57 T58 T60 T61 T62 T63 T64 T65 T66 T67 T68 T69 T70 T71 T72 T73 T74 T76 T78 T80 T100 T101 T400 T405 T406 T407 T408 T700 T701 T702 T703 T706 T708 LHTEC T800 APW T800 T900 T901 Turbofans TF30 TF31 TF32 TF33 TF34 TF35 TF37 TF39 TF41 F100 F101 F102 F103 F104 F105 F106 F107 F108 F109 F110 F112 F113 F117 F118 F119 YF120 F121 F122 F124 F125 F126 F127 F128 F129 F130 F135 F136 F137 F138 F400 F401 F402 F404 F405 F408 F412 F414 F415 Adaptive cycle engines XA100 XA101 XA102 XA103

---
Adapted from the Wikipedia article [Lycoming ALF 502](https://en.wikipedia.org/wiki/Lycoming_ALF_502) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Lycoming_ALF_502?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.