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TFE731
	TFE731-4R of a Cessna Citation VII
Type	Geared turbofan
National origin	United States
Manufacturer	Garrett AiResearch ; Honeywell Aerospace
First run	1970
Major applications	AIDC AT-3 ; CASA C-101 ; Cessna Citation III ; Hongdu JL-8 ; Dassault Falcon 900 ; Hawker 800 ; Learjet 31 ; Textron AirLand Scorpion ; Lockheed Martin RQ-170 Sentinel
Number built	11,000+
Developed into	Honeywell/ITEC F124/F125

The Garrett TFE731 (now Honeywell TFE731) is a family of geared turbofan engines commonly used on business jet aircraft. Garrett AiResearch originally designed and built the engine, which due to mergers was later produced by AlliedSignal and now Honeywell Aerospace.

Since the engine was introduced in 1972, over 11,000 engines have been built, flying over 100 million flight-hours.^[1]

Development

The TFE731 was based on the core of the TSCP700, which was specifically developed for use as the auxiliary power unit (APU) on the McDonnell Douglas DC-10. The design featured two important factors: low fuel consumption, and low noise profiles that met the newly established U.S. noise abatement regulations.

The first test run of the TFE731 occurred in 1970 at Garrett's plant in Torrance, California.^[2] The first production model, the TFE731-2, began rolling off the assembly line in August, 1972, and was used on the Learjet 35/36 and Dassault Falcon 10, both of which entered production in 1973.

The TFE731-3 was developed for use in the Lockheed JetStar re-engining program, and subsequent versions of it have been used on a number of aircraft, including the Learjet 55.

In 1975, the TFE731 was named Aviation Product of the Year by Ziff-Davis Publishing Company.^[3]

The -5 model was certified in 1982, and a decade later, an engine utilizing the TFE731-5 power section and a TFE731-3 fan was built and designated the TFE731-4, intended to power the Cessna Citation VII aircraft.^[4]

The most recent version is the TFE731-50, based on the -60 used on the Falcon 900DX, which underwent its flight test program in 2005. Honeywell has developed this engine complete with nacelle as a candidate to retrofit a number of aircraft equipped with older engines.^[5]

Design

The TFE731-60 has an inlet diameter of 0.787 m. The fan consists of 22 fan blades, 52 exit-guide vanes, and ten struts, and is driven by a gearbox. The five-stage compressor has four axial (LP) stages and one radial or centrifugal (HP) stage.

Variants

TFE731-2
TFE731-3
TFE731-4
TFE731-5
TFE731-20
TFE731-40
TFE731-50
TFE731-60
TFE731-1100

Applications

Jet trainers

Business jets

Specifications

Data from FAA^[6]

General characteristics

Type: Geared turbofan
Length: 49.7 in (126 cm)^[7]
Diameter: 39.4 in (100 cm)^[7]
Dry weight: 743–899 lb (337–408 kg)

Components

Compressor: 1 stage fan, 1.8:1 gearbox,^{[citation needed]} 4 axial LP stages, 1 centrifugal HP stage
Combustors: Annular
Turbine: 1 stage HP turbine (N2 max. 29,692-30,540 RPM), 3 stage LP turbine (N1 max. 20,688-21,000 RPM)

Performance

Maximum thrust: 3,500–4,750 lbf (15.6–21.1 kN)
Overall pressure ratio: 13:1^[7]
Bypass ratio: 2.8:1^{[citation needed]}
Fuel consumption: 875 lb/h (397 kg/h)^[8]
Specific fuel consumption: 0.469–0.517 lb/lbf/h (0.0133–0.0146 kg/kN/s)^[7]
Thrust-to-weight ratio: 4.7-5.3

Notes

^ "TFE731". Honeywell. Archived from the original on 2006-11-03. Retrieved 2006-12-05.
^ Schoneberger, William A.; Scholl, Robert R. H. (1985). Out of Thin Air: Garrett's First 50 Years. Phoenix: Garrett Corporation. p. 205. ISBN 0-9617029-0-7.
^ Schoneberger, p. 204.
^ "An Historical Look at the TFE731 Engine" (PDF). Duncan Debrief. Summer 2001. p. 11.
^ "Honeywell TFE731-50 Turbofan Engine Completes First Flight" (Press release). Honeywell. 2005-05-18. Archived from the original on 2016-03-03. Retrieved 2006-12-05.
^ "type-certificate data sheet no. E6WE" (PDF). FAA. May 9, 2000. Archived from the original (PDF) on November 15, 2016. Retrieved September 3, 2020.
^ ^a ^b ^c ^d "Gas Turbine Engines". Aviation Week & Space Technology. Jan 26, 2009. p. 119.
^ David Esler (Oct 27, 2016). "Honeywell's Super-Midsize HTF7000 Engine". Business & Commercial Aviation. Aviation Week.

References

Gunston, Bill (2006). World Encyclopedia of Aero Engines, 5th Edition. Phoenix Mill, Gloucestershire, England, UK: Sutton Publishing Limited. ISBN 0-7509-4479-X.
Leyes II, Richard A.; William A. Fleming (1999). "10". The History of North American Small Gas Turbine Aircraft Engines. Washington, DC: Smithsonian Institution. ISBN 1-56347-332-1.