Garrett TFE731

TFE731
Honeywell TFE731 and S-duct intake of a Dassault Falcon 900EX exposed during maintenance
Type	Geared turbofan
National origin	United States
Manufacturer	Garrett AiResearch Honeywell Aerospace
First run	1970
Major applications	CASA C-101 Cessna Citation III Dassault Falcon 900 Hawker 800 Learjet 31
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.

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. 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.

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 650 Citation VII aircraft.

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.

Design

The TFE731-60 has an inlet diameter of 0.787 m. The fan consists of 30 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

• Aero L-139 (prototype only)
• AIDC AT-3
• Boeing Skyfox
• British Aerospace BAe 125 Series 700
• CASA C-101
• Cessna Citation III
• Cessna Citation VI
• Cessna Citation VII
• Dassault Falcon 10
• Dassault Falcon 20 (retrofit)
• Dassault Falcon 50
• Dassault Falcon 900
• FMA IA 63 Pampa
• Gulfstream C-38 Courier
• Gulfstream G100/G150 (formerly IAI 1125 Astra SPX)
• Hawker 800/850XP
• Hawker 900XP
• Hongdu JL-8
• IAI 1124 Westwind I
• Learjet 31
• Learjet 35/Learjet C-21
• Learjet 40
• Learjet 45
• Learjet 55
• Learjet 70
• Lockheed 731 Jetstar/Jetstar II
• Textron AirLand Scorpion

Specifications (TFE731-2)

Data from

General characteristics

• Type: Turbofan
• Length: 50 in (127 cm)
• Diameter: 39 in (100 cm)
• Dry weight: 734 lb (333 kg)

Components

• Compressor: 1 stage fan, 4 axial high pressure compressor stages, 1 centrifugal high pressure compressor stage
• Combustors: Annular
• Turbine: 1 stage high pressure turbine, 3 stage low pressure turbine

Performance

• Maximum thrust: 3500 lbf (15.6 kN)
• Overall pressure ratio: 13:1
• Specific fuel consumption: 0.5 lb/lbf-hr
• Thrust-to-weight ratio: 4.7:1

See also

• Geared turbofan

Related development

• Honeywell/ITEC F124/F125

Comparable engines

• Honeywell ALF 502/LF 507
• Pratt & Whitney PW1000G
• Turbomeca Aspin/Astafan
• IAE SuperFan
• Rolls-Royce/SNECMA M45SD

Related lists

• List of aircraft engines

External links

• Honeywell TFE731 official web page