Lycoming T55


The Lycoming T55 is a turboshaft engine used on American helicopters and fixed-wing aircraft 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. 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.

Variants

;LTC4A-1:1,651 shp
;LTC4B-1:
;LTC4B-7:company designation for L-5
;LTC4B-8:company designation for L-7
;LTC4B-8D:2,970 shp
;LTC4B-11:similar to L-7 with two-stage gas generator turbine
;LTC4B-12:4,600 shp
;LTC4G-3:company designation for L-9
;LTC4G-4:
;LTC4K:9-stage compressor
;LTC4K-2:
;LTC4M-1:
;T5508D: 2,930 shp :Commercial version of the LTC4-8D
;AL5512:4,200 shp
;T55-L-1:
;T55-L-5:2,200 shp
;T55-L-7:2,650 shp
;T55-L-9:2,595 eshp
;T55-L-11:3,750 shp
;T55-L-712:3,750 shp
;T55-L-714:4,110 shp
;T55-L-714A:4,867 shp
;T55-GA-715:6,500 shp :variable vane control : under development.
;PLF1A-2:Turbofan with T55 7-stage compressor gas generator core
;PLF1B-2:Turbofan with T55 / LTC4K 9-stage compressor gas generator core
;Textron Lycoming AL5512: civil T55

Applications