Honeywell T55 Turboshaft Engine

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About the Honeywell T55-714A:

The Honeywell T55 is a Family of military turboshaft engines. The most prominent aircraft application is the Boeing CH-47 Chinook and MH-47 helicopters. The new CH-47F uses more powerful Honeywell T55-GA-714A engines that improve fuel efficiency and enhance lift performance. The T55-714A uses the latest engine technology and provides 4,168 continous shp - powering the CH-47F to speeds of up to 163 mph (263 km/h). To date, more than 6,000 T55 engines have been produced and the engine has accumulated over 12 million engine operating hours.

The T55-714A features a seven-stage axial compressor, a two-stage free power turbine, a two-stage gas producer turbine, centrifugal compressor, and a reverse-flow atomizing combustor. All models can be configured with a Full Authority Digital Electronic Control (FADEC) system.

Upgrade kits are currently available from Honeywell for the T55 Family of engines. These will update the engine with latest technology standards. Compared to older T55 engines, the T55-714A upgrade provides a 22% power increase, a 7% improvement in fuel efficiency and a significant enhancement of reliability and maintainability. Altogether, the upgrade results in a 25% reduction in operation and support costs. Also, the time between engine overhauls will increase to 3,000 hours. The goal is to go to on-condition maintenance in the future.

Honeywell's next generation T55-L-71X engines will offer the flexibility of even more power with improved SFC.

Sources Used: U.S. Department of Defense (DoD) and Honeywell International, Inc.

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Engine Type:

Military Turboshaft Engine


CH-47 Chinook
MH-47 Special Operations


In Production


Honeywell International, Inc.

Price/Unit Cost:

$1.06 million

Honeywell T55 Turboshaft Engine

By Joakim Kasper Oestergaard Balle /// Contact Forecast International

External Resources:

Honeywell: T55 Turboshaft Engine

YouTube: T55 Turboshaft Engine | YouTube Videos

Fact Sheet: Honeywell T55
Fact Sheet: T55 Upgrade for the CH-47


Engine Specifications: Honeywell T55-714A

Manufacturer: Honeywell International, Inc.
(originally produced by Lycoming Engines - Textron)
Power: Continous: 4,168 shp; Max: 4,867 shp
Overall Pressure Ratio at Maximum Power: 9.32
Compressor: Axial flow/centrifugal
Compressor Stages: 7-stage axial/1-stage centrifugal
Turbine: 2 HP + 2 PT
Engine Control: FADEC
Length: 47.1 in (1.2 m)
Diameter: 24.3 in (61.6 cm)
Dry Weight: 830 lbs (376 kg)
Platforms: CH-47 Chinook; MH-47 Special Forces Chinook
Price/Unit Cost: $1.06 million
Introduced: 1950s (first T55 model)
First Run: 1950s (first T55 model)
First Flight: September 21, 1961

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