Rolls-Royce T406

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T406 / AE 1107C-Liberty
V-22 main engine closeup.jpg
A T406 engine Nacelle on a V-22
Type Turboshaft
National origin United States
Manufacturer Allison Engine Company
Rolls-Royce plc
Major applications V-22 Osprey

The Rolls-Royce T406 (company designation AE 1107C-Liberty) is a turboshaft engine that powers the Bell-Boeing V-22 Osprey tiltrotor. The Osprey is in service with the United States Marine Corps and United States Air Force. The engine delivers 6,000 shp (4,470 kW).


The T406/AE1107C Liberty shares a common core with the AE 3007 and AE 2100 series of engines.

The V-22's T406 powerplants are housed in wing-tip tilting nacelles, allowing the distinctive flight characteristics of the V-22. For take off and landing the nacelles are directed vertically (90° to fuselage), while for forward flight they are rotated parallel to fuselage. The engine has been considered as a cost-effective upgrade for existing heavylift helicopters such as the CH-47 Chinook and the CH-53.[1]

In 2009 the GAO found that the engines failed after less than 400 hours of service, as compared to the estimated life of 500–600 hours.[2] Multiple updates to the engine platform in 2012-2013 have increased the lifespan significantly.

In April 2012, the DoD ordered 70 AE 1107C engines for the Osprey, with options for up to 268 engines.[3]

Engines with a future block 4 upgrade are expected to deliver ten thousand horsepower.[4]

The MT7 gas turbines that will be used to power the Ship-to-Shore Connector are a derived design of the T406.[5]


Specifications (T406)[edit]

General characteristics

  • Type: Turboshaft
  • Length: 78.1 in (1,980 mm)
  • Diameter: 34.2 in (890 mm)
  • Dry weight: 971 lb (440 kg)



See also[edit]

Related development
Related lists


  • Leyes II, Richard A.; William A. Fleming (1999). The History of North American Small Gas Turbine Aircraft Engines. Washington, DC: Smithsonian Institution. ISBN 1-56347-332-1. 

External links[edit]