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The Lycoming T55, (Company designation Lycoming LTC-4), is a turboshaft engine used on American helicopters and fixed-wing aircraft (in turboprop form), since the 1950s. It was designed at the Lycoming Turbine Engine Division in Stratford, Connecticut as a scaled-up version of the smaller Lycoming T53. Both engines are now produced by Honeywell Aerospace. The T55 also serves as the core of the Lycoming ALF 502 turbofan.
- Commercial version of the LTC4-8D
- variable vane control : under development.
- Type: Turboshaft
- Length: 1,196.3 mm (47.1 inches)
- Diameter: 615.9 mm (24.3 inches)
- Dry weight: 377kg (831 lbs)
- Comparable engines
- Related lists
- Gunston, Bill (2006). World Encyclopedia of Aero Engines, 5th Edition. Phoenix Mill, Gloucestershire, England, UK: Sutton Publishing Limited. p. 132. ISBN 0-7509-4479-X.