Engine Alliance GP7000

GP7000
A GP7270 installed on an Airbus A380.
Type	Turbofan
Manufacturer	Engine Alliance
First run	April 2004
Major applications	Airbus A380
Unit cost	$13.5 million (2006 USD)
Developed from	General Electric GE90 Pratt & Whitney PW4000

The Engine Alliance GP7000 is a turbofan jet engine manufactured by Engine Alliance. It is one of the powerplant options available for the Airbus A380, along with the Rolls-Royce Trent 900.

Design and development

Engine Alliance GP7000 turbofan awaiting installation on an Airbus A380

Originally intended to power Boeing Commercial Airplanes' cancelled 747-500X/-600X, the engine has since been pushed for Airbus' A380-800 superjumbo. It is built around an 0.72 scale of the GE90-110B/115B core ^[1] and contains a Pratt & Whitney fan and low-pressure system design.

The competing Rolls-Royce Trent 900 was named as the lead engine for the then-named A3XX in 1996 and was initially selected by almost all A380 customers. However the GE/PW engine increased its share of the A380 engine market to the point where as of September 2007 it will power 47% of the super-jumbo fleet. This disparity in sales was resolved in a single transaction, with Emirates' order of 55 GP7000-powered A380-800s, comprising over one quarter of A380 sales (as of September 2007). Emirates has traditionally been a Rolls-Royce customer. A380 aircraft powered by the GP7000s will have A380-86X model numbers as 6 is the code for Engine Alliance engines.

Ground testing of the engine began in April 2004 and was first flight tested as the number two engine on GE's 747 flying testbed over Victorville, CA in December 2004.^[2] The American Federal Aviation Administration certified the engine for commercial operation on January 4, 2006.^[3] The engine was ground run for the first time on an A380 on August 14, 2006 in Toulouse.^[4] On August 25, 2006, the same aircraft, A380-861 test aircraft (MSN 009), made the first flight of an Engine Alliance powered A380. The flight began and ended at Toulouse and lasted about four hours. Tests were performed on the engines' flight envelope, cruise speed, and handling. A day earlier, the same aircraft performed rejected takeoff tests on the engines.

The Engine Alliance offers the GP7200 for the Airbus A380 passenger and freighter configurations. The GP7270 is rated at 74,735 lbf (332.44 kN) of thrust whilst the GP7277 is rated at 80,290 lbf (357.1 kN). The engine is offered with two ratings appropriate for the various A380 configurations and take-off weights: GP7270 for the 560 tonne variant, and GP7277 for the 590 tonne A380-800 freighter. In mid-2011 an upgrade was announced which will lead to a cut in weight for each engine by 23 kg (51 lb). The new components come from Volvo Aero.^[5]

MTU Aero Engines is a major partner of the programme, with 22.5% share. The German company produces the high-pressure turbine, the low-pressure turbine and the turbine center frame. Techspace Aero (Safran) designs and produces the low-pressure compressor. MDS Aero is working hand in hand with MTU to develop next generation test beds.

MDS Aero in joint cooperation is building the facility to test the next version of this engine in France

Applications

• Airbus A380

Specifications (GP7270)

General characteristics

• Type: two-spool high-bypass turbofan engine
• Length: 4.74 m (15.6 ft; 187 in)
• Diameter: 3.16 m (10.4 ft; 124 in), fan tip 2.95 m (9.7 ft; 116 in)
• Dry weight: 6,712 kg (14,797 lb)

Components

• Compressor: 24 swept wide-chord hollow titanium fan blades, 8.7:1 by-pass ratio; five-stage low-pressure axial compressor; nine-stage high-pressure axial compressor
• Combustors: low-emissions single annular combustor
• Turbine: two-stage high pressure turbine, boltless architecture, single crystal blades, split blade cooling and thermal barrier coatings, axial flow; six-stage low-pressure axial flow

Performance

• Maximum thrust:
  
• 36,980 kgf, 363 kN, 81,500 lbf
• Overall pressure ratio: 43.9
• Air mass flow: 900 to 1,200 kg/s (2,000 to 2,600 lb/sec)
• Thrust-to-weight ratio: 5.197 (assuming 13,400 lbf weight of engine and 70,000 lbf of thrust)

See also

Comparable engines

• Rolls-Royce Trent 900

Related lists

• List of aircraft engines

References

1. "GE90-115 paves way for 'GEN X' Sonic Cruiser development". Flight Global. 2001-12-04. Retrieved 2016-02-14.
2. "GP7200 Takes to the Skies in First Flight Test" (Press release). GE Aviation. 2004-12-07. Retrieved 2012-06-25.
3. "GP7200 Achieves FAA Certification" (Press release). Engine Alliance. 2006-01-04. Retrieved 2012-06-24.
4. "Picture: Airbus begins engine runs on Engine Alliance GP7200-powered A380 in Toulouse". Flight Global. 2006-08-15. Retrieved 2012-06-24.
5. John Croft (2011-06-22). "PARIS: Engine Alliance cuts another 50 pounds from GP7200". Flight Global. Retrieved 2012-06-24.

• FAA certificate data sheet

External links

• Official site, Engine Alliance
• Official site, GE-Aviation
• Official site, Pratt & Whitney