Lycoming ALF 502

Source: Wikipedia, the free encyclopedia.
This article is about the American turbofan engine. For the Chinese rocket engine, see 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
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 in the early 1970s.

The Lycoming ALF 502/LF 507 (later Honeywell ALF 502/LF 507) is a

Honeywell Aerospace
. The U.S. military designation for the ALF 502 is YF102.

Development

In mid-1970, Avco Lycoming was advertising two

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

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, 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-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 CFS Aeroproducts Ltd (UK), then transferred in January 2021.[5]

Proposed variants

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).[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.

de Havilland Dash 8-400 regional turboprop, AlliedSignal abandoned the common core effort in July 1995.[10]

Design

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)

Applications

Avro RJ
YF102
ALF 502
LF 507

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
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
 0.406 lb/lbf/h (41.4 kg/kN/h)[15]
Thrust/weight 5.01 5.22 5.45 5.09

See also

Related development

Comparable engines

Geared turbofans

Related lists

Notes

  1. ^ includes essential engine accessories but excludes starter, hydraulic pump, integrated drive generator and exhaust nozzle

References

  1. ^
    OCLC 247550535.{{cite book}}: CS1 maint: multiple names: authors list (link
    )
  2. ISSN 0730-6784
    .
  3. OCLC 980678030
    .
  4. ISSN 0015-3710
    . Retrieved January 30, 2022.
  5. ^ "CFS Aeroproducts Inc. Chooses ATP as Exclusive Partner for ALF502 and LF507 Series Engine Publications" (Press release). ATP. July 27, 2021.
  6. hdl:2060/19730004744. alternate url
  7. ^
    Gale A12271580
    .
  8. ISSN 0005-2175
    .
  9. Gale A16362047
    .
  10. ^ "AlliedSignal plans turbine closure". FlightGlobal. July 11, 1995. Retrieved July 16, 2020.
  11. ^ a b "Type certificate data sheet E6NE" (PDF) (15th ed.). Department of Transportation, Federal Aviation Administration (FAA). June 7, 2002.
  12. ^
    Gale A15618034
    .
  13. OCLC 199793280
    .
  14. Gale A12736619
    .
  15. ^
    Honeywell Aerospace. November 29, 2010. Archived from the original
    on March 5, 2012.
  16. Gale A14335274
    .

Further reading

External links

Wikimedia Commons has media related to Lycoming ALF 502.
Retrieved from "https://en.wikipedia.org/w/index.php?title=Lycoming_ALF_502&oldid=1217010748"