America Military Turboshaft Designations

Pratt & Whitney XT57 (top) and J57 (bottom).

The following table provides a brief reference list of U.S. turboshaft engines in order by their military designation. The following information is provided:

• Manufacturer: The designer and builder of the engine; some engines were developed and built by multiple companies.
• Model: The manufacturer's internal model designation of the engine.
• Designation: The military designation of the engine, which consists of a Type designation (T = Turbofan) and sequence number. For unknown reasons, the numerical sequence was started at 30, with even numbers being assigned to US Navy projects and odd numbers being assigned to US Army and Air Force projects. These were followed by a manufacturer's code and subtype; for example J79-GE-19 indicates 79th turbojet procured, designed and/or manufactured by General Electric, 19th subvariant of this design. The subtype numbers were again assigned to military branch, with even numbers being used for US Navy projects and odd numbers being used for US Army and Air Force projects. Sometimes further changes were signified by an additional letter (J79-GE-19A), with 'W' being used for engines with water injection and 'WA' being used for engines with water-alcohol injection; the letters 'I' and 'O' were not used. Around 1968, the designation system was revised slightly. The numerical sequence and model suffixes are assigned as follows:
  • 100 - 399: US Air Force.
  • 400 - 699: US Navy.
  • 700 - 999: US Army.
• Aircraft: US military aircraft or projects which utilized the engine (other aircraft not listed).

T = Turboshaft       Manufacturer Model Designation Aircraft Westinghouse ? T30 ? General Electric TG-100 T31 F-81, F2R Pratt & Whitney ? T32 ? Frederick Flader Brigadier T33 ? Pratt & Whitney PT2 T34 C-97, C-133 Wright ? T35 ? Chrysler ? T36 ? Northrop Turbodyne T37 EB-35B Allison 501F-1 T38 F-88 Allison 504 T39 ? Allison 500 T40 F-84, H-28, X-18, FY, A2D, A2J, FV, P5Y, R3Y General Electric TG-110 T41 ? De Laval ? T42 ? Wright GTC-1 T43 ? Allison 503 T44 ? Pratt & Whitney PT4 T45 ? Fairchild ? T46 ? Wright ? T47 ? Pratt & Whitney ? T48 ? Wright TP51A2 T49 XB-47D Boeing 502-2E T50 XL-19B, QH-50 Teledyne CAE 220 T51 ? Pratt & Whitney ? T52 ? Lycoming LTC1 T53 AH-1, UH-1, OV-1, H-43, VZ-4DA Allison ? T54 ? Lycoming LTC4, AL55 T55 CH-47, X-19 Allison 501D T56 E-2, C-2, C-130, P-3, HCH, HRH Pratt & Whitney PT5 T57 C-124C, C-132 General Electric CT58 T58 CH-46, SH-2, SH-3, H-21, HH-52, X-22 ? ? T59 ? ? ? T60 ? ? ? T61 ? Solar Mercury T62 ? Allison 250 T63 OH-58, OH-6, TH-57, XV-11 General Electric ? T64 CH-53, AH-56, C-27, C-142, XV-9 Continental TS325 T65 ? Solar ? T66 ? Continental 217 T67 ? Rolls-Royce ? T68 ? Continental ? T69 ? Westinghouse ? T70 ? Allison ? T71 ? Continental ? T72 ? Pratt & Whitney JFTD12 T73 CH-54 Pratt & Whitney Canada PT6 T74 U-21 -- -- T75 not assigned? Garrett TPE331 T76 OV-10 -- -- T77 not assigned? Allison 545 T78 ? -- -- T79 not assigned? Allison ? T80 ? Sunstrand ? T100 ? Pratt & Whitney PT6A-45A T101 C-23 Pratt & Whitney Canada PT6T Twin Pac T400 UH-1, AH-1, H-59 ? ? T401 ? ? ? T402 ? ? ? T403 ? ? ? T404 ? Avco Lycoming PLT27 T405 LAMPS Mk III Allison AE1107, 501-M80C T406 V-22 General Electric GE38 T407 P-7 General Electric ? T408 LAMPS Mk III General Electric GE12 T700 AH-64, H-60, AH-63, AH-1, SH-2, UH-61 Allison 501-M62 T701 CH-62 Avco Lycoming LTS101 T702 HH-65 Allison 250 T703 OH-58D ? ? T704 ? ? ? T705 ? ? ? T706 ? ? ? T707 ? General Electric ? T708 ? LHTEC (Allison, Garrett) CTS800 T800 RAH-66, UH-1H Manufacturer Model Designation Aircraft

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