Engine Alliance GP7000
|A GP7270 installed on an Airbus A380.|
|First run||April 2004|
|Major applications||Airbus A380|
|Unit cost||$13.5 million (2006 USD)|
|Developed from||General Electric GE90
Pratt & Whitney PW4000
Design and development
Originally intended to power Boeing Commercial Airplanes's cancelled 747-500X/-600X, the engine has since been pushed for Airbus' A380-800 superjumbo. It is built around the GE90-110B/115B core 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. The American Federal Aviation Administration certified the engine for commercial operation on January 4, 2006. The engine was ground run for the first time on an A380 on August 14, 2006 in Toulouse. 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.
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.
- Type: two-spool high-bypass turbofan engine
- Length: 4.74 m (187 in)
- Diameter: 3.16 m (124 in), fan tip 2.95 m (116 in)
- Dry weight: 6,712 kg (14,797 lb)
- Compressor: hollow-titanium, 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
- 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: 5.508 (assuming 14,797 lbf weight of engine and 81,500 lbf of thrust)
- Comparable engines
- Related lists
- "GP7200 Takes to the Skies in First Flight Test" (Press release). GE Aviation. 2004-12-07. Retrieved 2012-06-25.
- "GP7200 Achieves FAA Certification" (Press release). Engine Alliance. 2006-01-04. Retrieved 2012-06-24.
- "Picture: Airbus begins engine runs on Engine Alliance GP7200-powered A380 in Toulouse". Flight Global. 2006-08-15. Retrieved 2012-06-24.
- John Croft (2011-06-22). "PARIS: Engine Alliance cuts another 50 pounds from GP7200". Flight Global. Retrieved 2012-06-24.
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