Rolls-Royce Trent 800

By 1990, as Boeing was studying the enlarged 767-X, Rolls-Royce was proposing its Trent engine with a larger fan driven by a new, bigger LP turbine, a modified IP compressor, and no exhaust mixer. Certification was applied for on 2 April 1992. Certification was granted by the EASA on 27 January 1995. The first Boeing 777 with Trent 800 engines flew on 26 May 1995, and ETOPS approval was granted by the FAA on 10 October 1996. The Trent 800 entered service on the Boeing 777 in 1996, After being rebuffed by British Airways, who selected the GE90 for their initial batch of Boeing 777s, Rolls-Royce launched the Trent 800 in September 1991 with a £250 million ($432.5 million) order from Thai Airways for their 15 Boeing 777s, with first deliveries for January 1996. In 1995, the Trent 800 won a large order from Singapore Airlines, a traditional Pratt & Whitney customer. The Singapore order was followed by large orders from American Airlines and Delta Air Lines. British Airways announced in September 1998 that it was returning to Rolls-Royce for its second batch of 777s, and did so again in April 2007. By July 1999, Rolls had won 45% of all engine orders for the 777. The Trent 800 later reached a 40% share of the engine market on the 777 variants for which it is available. The last Trent 800-powered 777 was delivered in 2010. Rolls-Royce had unsuccessfully offered the Trent 8104 for the second-generation 777 (originally 777-X, eventually produced for the -300ER, -200LR, 777-200LRF and 777F). However Boeing selected GE Aviation as the exclusive engine supplier for the second-generation 777 with high-output derivatives of the General Electric GE90, and again for the third-generation Boeing 777X (-8, -9) which will be equipped by the General Electric GE9X. ==Design==

fan blades. and the PW4000 is . Japanese Kawasaki Heavy Industries (KHI) and Marubeni Corporation are risk and revenue sharing partners on the Trent 800. ==Incidents==

On 17 January 2008, a British Airways Boeing 777-236ER, operating as British Airways Flight 38 (BA038) from Beijing to London, crash-landed at Heathrow after both Trent 800 engines lost power during the aircraft's final approach. The subsequent investigation found that ice released from the fuel system had accumulated on the fuel-oil heat exchanger, leading to a restriction of fuel flow to the engines. On 26 November 2008, Delta Air Lines Flight 18 from Shanghai to Atlanta, a Trent 895-powered Boeing 777, experienced an "uncommanded rollback" of one engine while in cruise at . The National Transportation Safety Board (NTSB) concluded the cause of both incidents was the same - ice clogging the inlet side of the fuel-oil heat exchanger (FOHE) of the affected engines. These incidents, along with a similar incident in May 2009 involving an Airbus A330 with Rolls-Royce Trent-700 engines, resulted in Airworthiness Directives mandating the replacement of the fuel-oil heat exchangers in similar Rolls-Royce Trent series engines. Rolls-Royce developed a modification to prevent the problem recurring that involved replacing a face plate that had many small protruding tubes with one that is flat. ==Variants==

• RB211 Trent 875-17 (Trent 875-17): Certified 27 January 1995, pressure ratio of 33.9, takeoff thrust of . • RB211 Trent 877-17 (Trent 877-17): Certified 27 January 1995, pressure ratio of 34.7, takeoff thrust of . • RB211 Trent 884-17 (Trent 884-17): Certified 27 January 1995, pressure ratio of 37.5, takeoff thrust of . • RB211 Trent 884B-17 (Trent 884B-17): Certified 26 November 1999, pressure ratio of 37.5, takeoff thrust of . • RB211 Trent 892-17 (Trent 892-17): Certified 13 November 1996, pressure ratio of 39.6, takeoff thrust of . • RB211 Trent 892B-17 (Trent 892B-17): Certified 16 April 1997, pressure ratio of 39.6, takeoff thrust of . • RB211 Trent 895-17 (Trent 895-17): Certified 22 June 1999, pressure ratio of 40.7, takeoff thrust of . ==Engines on display==

• A Trent 800 is on display at the Rolls-Royce Heritage Trust Collection, Derby • A Trent 800 is on display at the Imperial War Museum Duxford, in the first hall ==Specifications (Trent 800)==