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HTF7000

Type	Turbofan
National origin	United States
Manufacturer	Honeywell Aerospace
First run	1999
Major applications	Bombardier Challenger 300/350 Cessna Citation Longitude Embraer Legacy 500/450 Gulfstream G280
Number built	Approaching the 2,000th

The Honeywell HTF7000 is a turbofan engine produced by Honeywell Aerospace. Rated in the 6,540–7,624 lbf (29.09–33.91 kN) range, the HTF7000 is used on the Bombardier Challenger 300/350, Gulfstream G280, Embraer Legacy 500/450 and the Cessna Citation Longitude. Its architecture could be extended for a range of 8,000 to 10,000 lbf (36 to 44 kN) thrust.

Operational history

The engine was originally designated the AS907, which was changed in 2004 to HTF7000; the AS907 designation is still used for legal and regulatory use. By October 2016, 2.6 million hours had been logged by 1,400 in service engines and it has a 99.9% dispatch reliability rate. Average fuel consumption is about 950 lb. per hour for a 7,765 lbf engine on a G280, to be compared to 875 lb. per hour for a 4,420 lbf TFE731 on a G150. More than 3.5 million flight hours have been logged till October 2017, and the 2,000th engine should be delivered in 2018.

Honeywell maintenance program is $447 for two engines per hour. Borescope inspections extends time between overhaul and some engines have remained installed for up to 10,000 hr. It has line replaceable components installed with hand tools and is designed for condition-based maintenance.

Variants

HTF5000 / AS905: A 5,000 lbf (22 kN; 2,300 kgf) thrust variant, unsuccessfully targeted toward the Dassault Falcon 7X.

HTF7000 / AS907-1-1A: 6,826 lbf (30.36 kN) original variant of the engine. Developed for the Bombardier Challenger 300.

AS977: Higher thrust variant of the AS907, designed at the same time, intended to power BAE System's Avro RJX. The aircraft was cancelled after three airframes were built and flown; subsequently this variant never entered production.

HTF7250G / AS907-2-1G: 7,624 lbf (33.91 kN) variant developed for use on the Gulfstream G280.

HTF7350 / AS907-2-1A: 7,323 lbf (32.57 kN) Variant developed for use on the Bombardier Challenger 350.

HTF7500E / AS907-3-1E: 6,540–7,036 lbf (29.09–31.30 kN) variant developed for the Embraer Legacy 500/450 business jets and the Praetor 500/600.

HTF7700L / AS907-2-1S: 7,550 lbf (33.6 kN) for the Cessna Citation Longitude.

HTF10000: A 10,000 lbf (44 kN; 4,500 kgf) nominal thrust variant.

Applications

Specifications

Data from FAA.

General characteristics

Type: Turbofan
Length: 92.4 in (234.7 cm)
Diameter: 34.2 in (87 cm) fan
Dry weight: 1,514–1,534 lb (687–696 kg)

Components

Compressor: 22 internally reinforced blades fan, 16:1 pressure ratio HP: four stage axial + one stage centrifugal
Combustors: Annular
Turbine: Two stage HP turbine, three stage LP turbine
Oil system: Pressure spray with scavenge and dry sump

Performance

Maximum thrust: 6,944–7,638 lbf (30.89–33.98 kN)
Cruise thrust: 1,910 lbf (8.5 kN)
Overall pressure ratio: 28.2
Bypass ratio: 4.4:1
Fuel consumption: 950 lb/h (430 kg/h)
Specific fuel consumption: Static sea level: 0.42 lb/(lbf⋅h) (12 g/(kN⋅s)); Cruise: 0.642 lb/(lbf⋅h) (18.2 g/(kN⋅s))
Power-to-weight ratio: 4.53 - 4.98

References

"AlliedSignal powers up AS900 turbofan". Flight Global. 18 August 1999.
^ "Honeywell Engine Receives Certification for Textron Aviation's Cessna Citation Longitude" (Press release). Honeywell. October 5, 2017. Archived from the original on October 6, 2017. Retrieved October 6, 2017.
^ David Esler (Oct 27, 2016). "Honeywell's Super-Midsize HTF7000 Engine". Business & Commercial Aviation. Aviation Week.
^ "Honeywell gives AS907 turbofan redesignation". Flight International. 13 January 2004.
Fred George (Nov 1, 2014). "Pilot Report: Bombardier Challenger 350". Business & Commercial Aviation. Aviation Week.
"The 7X factors". Flight Daily News. June 14, 2003. Retrieved July 17, 2020.
^ "Honeywell AS907 engine service bulletin: Reduced intervals for oil filter analysis & ECU". September 2019. Retrieved July 29, 2020.
Lowe, Paul (April 23, 2008). "Honeywell's AS907 gets nod, production begins". Aviation International News. Vol. 34, no. 18 (published August 2002). pp. 32–33.
- Lowe, Paul (31 July 2002). "Honeywell's AS907 gets Nod, Production Begins". Aviation International News (Catalog record).
"G280 Specifications" (PDF). Gulfstream. 2015. Archived from the original (PDF) on 2016-07-05. Retrieved 2016-06-27.
Guy Norris (24 May 2010). "Embraer's Legacy 450/500 Engine Enters Test At Honeywell". Aviation Week & Space Technology.
"Cessna showcases new Citation Longitude at NBAA 2015; announces large cabin Citation Hemisphere" (Press release). Textron Aviation. 16 November 2015.
Epstein, Curt (May 31, 2007). "HTF10000 moves toward late-'08 core run". Business Aviation. AINonline. Retrieved July 17, 2020.
"AS907 Type Certificate Data Sheet, Revision 7" (PDF). FAA. 22 March 2016. Archived from the original (PDF) on 15 November 2016. Retrieved 27 June 2016.
"Honeywell HTF7000". Flug Revue. 18 April 2013. Archived from the original on 1 December 2016. Retrieved 1 December 2016.
^ "NBAA 2006: Engine giants power up for growth". Flight Global. 17 October 2006.
Fred George (Feb 25, 2016). "Honeywell HTF7700L Turbofans". Business & Commercial Aviation. Aviation Week.
^ "Honeywell HTF7000" (PDF). Aviation gas turbine forecast. Forecast International (Report). September 2010. p. 2.
Élodie Roux (2007). "AS907". Turbofan and turbojet engines: Database handbook. Elodie Roux. p. 67. ISBN 9782952938013. OCLC 879328119.

External links

"HTF7000 Turbofan Engine". Honeywell.
Winstanley, David K. (September 25, 2013). HTF7000 engine design, development and uses. SAE 2013 AeroTech Congress & Exhibition. SAE International Journal of Aerospace. Vol. 6, no. 2. Montreal, Quebec, Canada: Society of Automotive Engineers (SAE). pp. 545–554. doi:10.4271/2013-01-2228. ISSN 1946-3855. OCLC 5817999777.