Honeywell's T55-GA-714A turboshaft engine on a CH-47 Chinook
Type
Turboshaft
National origin
United States
Manufacturer
Lycoming Engines Honeywell Aerospace
First run
April 1955
Major applications
Bell 309 KingCobra Boeing CH-47 Chinook Piper PA-48 Enforcer
Number built
6,000+
Developed from
Lycoming T53
Developed into
Lycoming ALF 502
The Honeywell T55 (formerly Lycoming; company designation LTC-4) is a turboshaft engine used on American helicopters and fixed-wing aircraft (in turboprop form) since the 1950s, and in unlimited hydroplanes since the 1980s. As of 2021, more than 6,000 of these engines have been built.[1] It is produced by Honeywell Aerospace, a division of Honeywell based in Scottsdale, Arizona, and was originally designed by the Turbine Engine Division of Lycoming Engines in Stratford, Connecticut, as a scaled-up version of the smaller Lycoming T53. The T55 serves as the engine on several major applications including the CH-47-Chinook, the Bell 309, and the Piper PA-48 Enforcer. The T55 also serves as the core of the Lycoming ALF 502 turbofan. Since the T55 was first developed, progressive increases in airflow, overall pressure ratio, and turbine inlet temperature have more than tripled the power output of the engine.[2][3][4]
^"Honeywell to provide more T55 engines for Chinooks - Shephard Media". www.shephardmedia.com. Retrieved 2021-10-28.
^"1,500 s.h.p. Lycoming". Flight International. April 5, 1957. p. 432. ISSN 0015-3710. Archived from the original on April 26, 2019.
^"Aero engines 1959..." Flight International. March 20, 1959. p. 406. ISSN 0015-3710. Archived from the original on April 26, 2019.
^"Congress supports Chinook upgrade". Flight International. October 23–29, 1996. p. 22. ISSN 0015-3710. Archived from the original on April 3, 2016.
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