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Rolls-Royce Trent 500
The Rolls-Royce Trent 500 is a turbofan engine, developed from the RB.211 and is one of the family of Trent engines.
==Design and development==
In 1995, Airbus began considering an engine for two new long-range derivatives of its four-engined A340 aircraft, designated A340-500/-600. The existing -200 and -300 models were powered by CFM International CFM56 engines (which had been selected in April 1987 before the Trent family was launched). However, the CFM56 was at the limit of its development capability, and would be unable to power the new A340-500/-600. In April 1996, Airbus signed an agreement with General Electric to develop a suitable engine, but decided not to proceed when GE demanded an exclusivity deal on the A340. After a contest with Pratt & Whitney, Airbus announced on 15 June 1997 at the Paris Air Show that it had selected the Trent 500 to power the A340-500 and -600.〔(【引用サイトリンク】 url = http://www.flug-revue.rotor.com/frtypen/FRA34060.htm )〕
The Trent 500 first ran in May 1999 and achieved certification in December 2000. It entered service on the A340-600 with Virgin Atlantic Airways in July 2002 and on the ultra-long range A340-500 with Emirates in December 2003.〔Air Canada had been expected to be the launch customer for the A340-500 in May 2003, but just before this on 1 April 2003 the airline filed for bankruptcy protection which resulted in delivery of its two A340-500s being delayed. This allowed Emirates to be the first airline to operate the type.〕 After production of the Airbus A340 ended in 2011, a total of 131 A340-500/-600 have been delivered with 524 Trent 500 engines altogether; Lufthansa is the largest operator, with 24 delivered A340-600.
The Trent 500 powers the Airbus A340-500 and A340-600. It was certificated at thrust, but derated to as the Trent 553 to power the A340-500, and to as the Trent 556 for the A340-600 and A340-500HGW. However, a version is installed in the A340-600HGW ''(High Gross Weight)'', a higher-performance version of the A340-600. The Trent 500 has the same wide-chord fan as the Trent 700, together with a core scaled from the Trent 800.
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