Honeywell T55 Turboshaft Engine

T55

Honeywell's T55-GA-714A turboshaft engine on a CH-47 Chinook
Type  | Turboshaft
National origin | United States
Manufacturer  | Lycoming Engines
Honeywell Aerospace
First run  | 1950s
Major applications | CH-47 Chinook
Bell 309
Piper PA-48 Enforcer
Number built | 6,000+
Developed from | Lycoming T53
Developed into | Lycoming/Vericor TF40

Lycoming ALF 502

The Honeywell T55 is a turboshaft engine used on American helicopters and fixed-wing aircraft (in turboprop form) since the 1950s, and in unlimited hydroplanes since the 1980s. Today, there have been more than 6,000 of these engines built.[1] It is produced by Honeywell Aerospace, a division of Honeywell based in Phoenix, Arizona, and was originally designed by 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, and the T55 serves as the engine on several major applications including the CH-47-Chinook, the Bell 309, and the Piper PA-48 Enforcer. 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.[2][3][4]

## Contents

* 1 Variants
* 2 Applications
* 3 Specifications (T55-L-714A)
* 3.1 General characteristics
* 3.2 Components
* 3.3 Performance
* 4 See also
* 5 References
* 6 External links

## Variants

LTC4A-1
1,651 shp (1,232kW)
LTC4B-1

LTC4B-7
company designation for L-5
LTC4B-8
company designation for L-7
LTC4B-8D
2,970 shp (2,216 kW)
LTC4B-11
similar to L-7 with two-stage gas generator turbine
LTC4B-12
4,600 shp (3,432 kW)
LTC4G-3
company designation for L-9
LTC4G-4

LTC4K
9-stage compressor
LTC4K-2

LTC4M-1

T5508D
2,930 shp (2,186 kW):Commercial version of the LTC4-8D
AL5512
4,200 shp (3,133 kW)
T55-L-1

T55-L-5
2,200 shp (1,641 kW)
T55-L-7
2,650 shp (1,977 kW)
T55-L-9
2,595 eshp (1,936 kW)
T55-L-11
3,750 shp ( 2,798 kW)
T55-L-712
3,750 shp ( 2,798 kW)
T55-L-714
4,110 shp (3,066 kW)
T55-GA-714A
5,000 shp (3,729 kW)
T55-L-714A
5,000 shp (3,729 kW)
T55-GA-714C
6,000 shp (4,474 kW)
T55-L-714C
6,000 shp (4,474 kW)
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

* Bell 214
* Bell 309
* Boeing CH-47 Chinook
* Boeing Chinook (UK variants)
* Boeing Model 360
* Boeing RC-135 \- One T55 was fitted to the RC-135E derivative to provide power to the aircraft's phased array radar.[citation needed]
* Curtiss-Wright X-19
* North American YAT-28E Trojan
* Piper PA-48 Enforcer
* Sikorsky–Boeing SB-1 Defiant
* unlimited hydroplanes

## Specifications (T55-L-714A)

#### General characteristics

* Type: Turboshaft
* Length: 1,196.3 mm (47.10 in)
* Diameter: 615.9 mm (24.25 in)
* Dry weight: 377 kg (831 lb)

#### Components

* Compressor: 7-stage axial and 1-stage centrifugal
* Combustors: reverse flow
* Turbine: 2-stage gas producer and 2-stage free power

#### Performance

* Maximum power output: Engine Shaft Horsepower Class: 5,000 shp (3,729 kW)
* Overall pressure ratio: 9.32[5]
* Turbine inlet temperature: 815 °C (1,499 °F) (power turbine inlet temperature)
* Power-to-weight ratio: (4,867 shp / 831 lbs) ~ 5.8568:1 shp/lb

## See also

Comparable engines

* Allison T56
* Bristol Proteus
* Napier Eland
* Rolls-Royce Tyne

Related lists

* List of aircraft engines

## References

1. ↑ "Honeywell to provide more T55 engines for Chinooks - Shephard Media" (in en). https://www.shephardmedia.com/news/defence-helicopter/honeywell-provide-more-t55-engines-chinooks/.
2. ↑ "sherpa | college | aeronautics | 1957 | 0430 | Flight Archive". Flightglobal.com. https://www.flightglobal.com/pdfarchive/view/1957/1957 - 0430.html?search=T55.
3. ↑ "helicopter engine | american airlines | dry weight | 1959 | 0813 | Flight Archive". Flightglobal.com. https://www.flightglobal.com/pdfarchive/view/1959/1959 - 0813.html?search=T55.
4. ↑ "1996 | 2830 | Flight Archive". Flightglobal.com. 1996-10-29. https://www.flightglobal.com/pdfarchive/view/1996/1996 - 2830.html?search=T55-L-714A.
5. ↑ "CH-47D Power Plants (714) (AQC/IPC/MOI/FEIC)". http://www.chinook-helicopter.com/standards/Army_D_Model_AQC_Classes/Engine_714.pdf.

* 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.

## External links

* Honeywell T55 page

* v
* t
* e

Garrett/AlliedSignal/Honeywell aircraft engines

Turboprops/Turboshafts|

* AGT1500*
* HTS900
* LTS101/LTP101*
* T53*
* T55*
* TPE331
* TPF351

Turbofans|

* ALF 502/LF507*
* ATF3
* F109
* FX5
* HTF7000 (AS907)
* TFE731

Joint development|

| CFE Company:|

* CFE738 (Turbofan)

|

GE/Honeywell:|

* LV100 (Turboshaft)

ITEC:|

* F124/TFE1042
* F125 (Turbofans)

LHTEC:|

* CTS800 (Turboshaft)

ATEC:|

* T900 (Turboshaft)

Note: AVCO Lycoming/Textron Lycoming engines marked with *

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