Garrett TFE731

{{Short description|Turbofan aircraft engine}}  {{infobox aero engine |name= TFE731 |image= File:TFE731-4R one.JPG |caption= TFE731-4R of a Cessna Citation VII |engine_type= Geared turbofan |national_origin = United States |manufacturer= {{ubl | Garrett AiResearch | Honeywell Aerospace }} |first_run= 1970 |major_applications= {{ubl|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_from = |variants_with_their_own_articles = |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.<ref>{{cite web |url=http://www.honeywell.com/sites/aero/Turbofans3_C67D99379-5387-BE15-B14A-CEC340B87662_HBAD5694B-4CA1-AFC7-FFF9-80390091EFE5.htm |publisher=Honeywell |title=TFE731 |access-date=2006-12-05 |archive-url=https://web.archive.org/web/20061103212418/http://www.honeywell.com/sites/aero/Turbofans3_C67D99379-5387-BE15-B14A-CEC340B87662_HBAD5694B-4CA1-AFC7-FFF9-80390091EFE5.htm |archive-date=2006-11-03 |url-status=dead }}</ref>

==Development== [[File:Dassault Falcon 900EX, Italy - Air Force JP6346097.jpg|thumb|Honeywell TFE731 and S-duct intake of a Dassault Falcon 900EX exposed during maintenance]] thumb|View of a TFE731-4R in maintenance with cowlings, afterbody and thrust reverser removed The TFE731 was based on the core of the TSCP700, which was developed for use as the auxiliary power unit (APU) on the McDonnell Douglas DC-10.<ref name="DuncanDebrief1">{{citation|title=An Historical Look at the TFE731 Engine|work=Duncan Debrief|date=Summer 2001|pages=10–11|url=http://www.duncanaviation.aero/files/debrief/2001-Summer.pdf|publisher=Duncan Aviation|archive-url=https://web.archive.org/web/20101224013930/http://www.duncanaviation.aero/files/debrief/2001-Summer.pdf|archive-date=2010-12-24}}</ref>{{rp|p=11}} The design featured two important factors: low fuel consumption, and low noise profiles that met the newly established U.S. noise abatement regulations.<ref name="DuncanDebrief1" />{{rp|p=11}}

The first test run of the TFE731 occurred in 1970 at Garrett's plant in Torrance, California.<ref>{{cite book|first1=William A. |last1=Schoneberger |first2= Robert R. H. |last2=Scholl|title=Out of Thin Air: Garrett's First 50 Years|location= Phoenix|publisher= Garrett Corporation|year= 1985 |isbn=0-9617029-0-7|page= 205}}</ref> 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,<ref name="DuncanDebrief1" />{{rp|p=11}} 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.<ref>Schoneberger, p. 204.</ref>

The -5 model was certified in 1982,<ref name="DuncanDebrief1" />{{rp|p=11}} 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.

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.<ref>{{cite press release |url=http://www51.honeywell.com/honeywell/news-events/press-releases-details/06.03.05TFE73150_Turbofan_Engine_Completes.html?c=31 |title=Honeywell TFE731-50 Turbofan Engine Completes First Flight |access-date=2006-12-05 |date=2005-05-18 |publisher=Honeywell |archive-date=2016-03-03 |archive-url=https://web.archive.org/web/20160303232542/http://www51.honeywell.com/honeywell/news-events/press-releases-details/06.03.05TFE73150_Turbofan_Engine_Completes.html?c=31 |url-status=dead }}</ref>

==Design== The TFE731-60 has an inlet diameter of 0.787 m. The fan consists of 22 fan blades, 52 exit-guide vanes, and 10 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 {{columns-list|colwidth=15em| * Aero L-139 (prototype only) * AIDC AT-3 * Boeing Skyfox * CASA C-101 * FMA IA 63 Pampa * Hongdu JL-8 * Textron AirLand Scorpion }}

Business jets {{columns-list|colwidth=15em| * BAe 125/Hawker 800 * Cessna Citation III/VI/VII * Dassault Falcon 10 * Dassault Falcon 20 (retrofit) * Dassault Falcon 50 * Dassault Falcon 900 * Gulfstream G100 (ex IAI Astra) * IAI Westwind * Learjet 31 * Learjet 35 * Learjet 40 * Learjet 45 * Learjet 55 * Learjet 70 * Lockheed JetStar/Jetstar II * North American Sabreliner 65 * Experimental Yak-40MS upgrade }}

==Specifications== {{jetspecs   |ref=FAA<ref>{{cite web |url= https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgMakeModel.nsf/0/39439532f4272527862568f7006f821d/$FILE/E6we.pdf |title= type-certificate data sheet no. E6WE |date= May 9, 2000 |publisher= FAA |access-date= September 3, 2020 |archive-date= November 15, 2016 |archive-url= https://web.archive.org/web/20161115131008/http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgMakeModel.nsf/0/39439532f4272527862568f7006f821d/$FILE/E6we.pdf |url-status= dead }}</ref> |type=Geared turbofan |length={{cvt|49.7|in|cm|0|lk=on}}<ref name=AvWeek26jan2009/> |diameter={{cvt|39.4|in|cm|0}}<ref name=AvWeek26jan2009/> |weight={{cvt|743-899|lb|kg|0|lk=on}} |compressor=1 stage fan, 1.8:1 gearbox,{{citation needed|date=November 2019}} 4 axial LP stages, 1 centrifugal HP stage |combustion=Annular |turbine=1 stage HP turbine (N2 max. 29,692-30,540 RPM), 3 stage LP turbine (N1 max. 20,688-21,000 RPM) |fueltype= |oilsystem= |thrust={{cvt|3500-4750|lbf|kN|lk=on}} |compression=13:1<ref name=AvWeek26jan2009/> |bypass=2.8:1{{citation needed|date=November 2019}} |turbinetemp= |fuelcon={{cvt|875|lb/h}}<ref name=AW161027>{{cite web |url= http://aviationweek.com/bca/honeywell-s-super-midsize-htf7000-engine |title= Honeywell's Super-Midsize HTF7000 Engine |date= Oct 27, 2016 |author= David Esler |work= Business & Commercial Aviation |publisher= Aviation Week}}</ref> |specfuelcon={{cvt|0.469-0.517|lb/lbf/h|kg/kN/s}}<ref name=AvWeek26jan2009>{{cite magazine|title=Gas Turbine Engines|magazine=Aviation Week & Space Technology |date= Jan 26, 2009|page=119|url=https://archive.aviationweek.com/issue/20090126#!&pid=119 |url-access= subscription}}</ref>

|power/weight= |thrust/weight={{#expr:3500/743round1}}-{{#expr:4750/899round1}} }}

==See also== {{Aircontent |related= * Honeywell/ITEC F124/F125

|lists= * List of aircraft engines

|see also= * Geared turbofan }}

==Notes== {{reflist}}

==References== * {{cite book |last= Gunston |first= Bill |title= World Encyclopedia of Aero Engines, 5th Edition |year= 2006 |publisher= Sutton Publishing Limited |location= Phoenix Mill, Gloucestershire, England, UK |isbn= 0-7509-4479-X }} * {{cite book|last=Leyes II|first=Richard A.|author2=William A. Fleming|title=The History of North American Small Gas Turbine Aircraft Engines|publisher=Smithsonian Institution|location=Washington, DC|date=1999|chapter=10|isbn=1-56347-332-1 }}

==External links== {{Commons category|Honeywell TFE731}} * [https://aerospace.honeywell.com/en/products/engines/tfe731-turbofan-engine Honeywell TFE731 official website] {{Webarchive|url=https://web.archive.org/web/20161119150452/https://aerospace.honeywell.com/en/products/engines/tfe731-turbofan-engine |date=2016-11-19 }}

Category:Centrifugal-flow turbojet engines Category:Geared turbofan engines Category:Honeywell Category:Medium-bypass turbofan engines Category:Mixed-compressor gas turbines Category:1970s turbofan engines