Helicopter Engines

Lycoming T55

Lycoming T55

First instroduced in 1955, more than 6,000 T55 engines have been produced, logging some 12 million flight hours with different Chinook variants. The first T55 produced 1,600 shaft horsepower (SHP), after several decades and generations of development, the lastest variant -714 now offers 4,800 SHP and powers the Chinook to a maximum speed of 196 mph / 170 knots.
Lycoming is now part of Honeywell

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Type: Turboshaft


Honeywell to Upgrade Chinook’ T55 Engines, 16-Oct-19 : #T55 Honeywell is launching a new T55 engine upgrade for the US Army’s CH-47 Chinook helicopters which will offer over 20% more power at sea level. In operation since 1962, more than 6,000 T55 engines having been produced and logging 12 million hours of operation

T55 Engines Powers the SB>1 Defiant, 16-Apr-19 : #T55 A pair of Honeywell T55 engines powered the Future Vertical Lift (FVL) demonstrator Sikorsky/Boeing SB>1 Defiant intended to modernize the US Army Aviation branch

SB>1 Defiant Begun Ground Tests, 14-Jan-19 : #Defiant The Boeing/Sikorsky SB>1 Defiant demonstrator run first ground tests

Honeywell Overhauled 1000th T55 Engine, 15-Feb-18 : The Corpus Christi Army Depot completed the overhaul of the 1,000th T55 engine. More than 6,000 T55 have been produced and logged more than 12 million hours of operation on the CH/MH-47 Chinook

Depot Delivers 400th Honeywell T-55 Engine, 19-Nov-10 : Corpus Christi, TX by Ed Mickley, CCAD Public Affairs - Corpus Christ Army Depot with partner, Honeywell International, celebrated completion of the 400th T55-GA-714A engine overhaul with a small cake-cutting ceremony here Nov. 17, 2010.

Used by

Sikorsky SB>1 Defiant


LTC4B-8D / T55-08D2970

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