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The Pratt & Whitney PW1000G is a high-bypass geared turbofan engine family, currently selected as the exclusive engine for the Bombardier CSeries, Mitsubishi Regional Jet (MRJ), Embraer's second generation E-Jets, and as an option on the Irkut MC-21 and Airbus A320neo. The project was previously known as the Geared Turbofan (GTF), and originally the Advanced Technology Fan Integrator (ATFI). The engine took nearly 30 years to develop and is expected to deliver reductions in fuel use and ground noise when used in next-generation aircraft. The first engines are planned to begin commercial use before the end of 2015. ==Development== Pratt & Whitney first attempted to build a geared turbofan starting around 1998, known as the PW8000.〔(【引用サイトリンク】title=Pratt & Whitney's surprise leap. (starts design of PW8000 engine)(Turf Wars in the 10t Engine Market)(Cover Story) )〕 This essentially was an upgrade of the existing Pratt & Whitney PW6000 that replaced the fan section with a gearing system and new single-stage fan.〔(【引用サイトリンク】title=SAE International -- mobility engineering )〕 After several years of development the PW8000 essentially disappeared.〔(【引用サイトリンク】title=The Dougloid Papers )〕 Soon afterwards the ATFI project appeared, using a PW308 core but with a new gearbox and a single-stage fan. It had its first run on March 17, 2001. This led to the Geared Turbofan (GTF) programme, which was based around a newly designed core jointly developed with MTU Aero Engines of Germany. The German company provides the high-speed low-pressure turbine and various stages of the high-pressure compressor. In addition to the geared turbofan, the initial designs included a variable-area fan nozzle (VAFN), which allows improvements in propulsive efficiency across a range of the flight envelope.〔(【引用サイトリンク】accessdate=2011-02-27 )〕 However, the VAFN has since been dropped from production designs due to high system weight. In July 2008, the GTF was renamed the PW1000G, the first in a new line of "PurePower" engines. Pratt & Whitney claims the PW1000G is 10% to 15% more fuel efficient than current engines used on regional jets and single-aisle jets, as well as being up to 75% quieter.〔Garvey, William. (Pratt Gears Up for PW1000G ) ''Aviation Week''. Accessed: 9 January 2011.〕 〔 The engine was tested on the Pratt & Whitney Boeing 747SP,〔 and the second phase of flight testing for the PW1000G was conducted on an Airbus A340-600. The testbed aircraft, with the engine in the number two pylon position, flew for the first time in Toulouse on October 14, 2008.〔(Airbus-owned A340 flies P&W geared turbofan engine )〕 The PW1100G was first tested on the 747SP in 2013.〔(【引用サイトリンク】title=IN FOCUS: Pratt completes first flight of PW1100G engine )〕 Testing of the PW1524G model began in October 2010.〔(【引用サイトリンク】accessdate=2010-10-31 )〕 The PW1500G engine successfully achieved Transport Canada type certification on February 20, 2013.〔(News - Media Centre ). Bombardier. Retrieved on 2013-12-09.〕 The PW1100G engine successfully achieved FAA type certification on December 19, 2014.〔(FAA Certifies PurePower® Engine for A320neo Aircraft )〕 The first flight test on one of its intended production airframes, the Bombardier CS100, was on 16 September 2013.〔(【引用サイトリンク】accessdate=2015-08-02 )〕 The first flight of the Airbus A320neo followed a year later, on 25 September 2014.〔(【引用サイトリンク】accessdate=2015-05-20 )〕 The engine took an unusually long time to develop - roughly 30 years from the first conception - and required an investment of $10 billion over the project's lifetime. 〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Pratt & Whitney PW1000G」の詳細全文を読む スポンサード リンク
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