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The Ishikawajima-Harima Heavy Industries (IHI) F3 is a low bypass turbofan engine developed in Japan by Ishikawajima-Harima Heavy Industries for the Kawasaki T-4 jet trainer aircraft. The first prototype engine, the XF3, was manufactured in 1981 and first flew in the XT-4 in July 1985. ==Design and development== Ishikawajima-Harima began developing a small turbofan engine in the late 1970s as a competitor for the new jet trainer aircraft being developed by Kawasaki Heavy Industries. The developmental engine was named the XF3, and it was selected over the SNECMA Turbomeca Larzac in 1982 to power the XT-4 trainer. The early developmental models of the engine produced of thrust, but later models (including the model selected for the XT-4) produced of thrust.〔(Japanese trainer engine selected ). (1982, December 11). Flight International, 1677. Accessed February 4, 2010.〕 The production engine was designated the F3-30 (alternatively, the F3-IHI-30), and it first flew in the XT-4 aircraft in 1985. Production of the qualified engine also began in 1985.〔Hamada, T., Akagi, M., Toda, D., Shimazaki, H., & Ohmomo, M. (1989). T-4 Inlet/Engine Compatibility Flight Test Results. Presented at the ''AIAA/ASME/SAE/ASEE 25th Joint Propulsion Conference'', Monterey, CA: American Institute of Aeronautics and Astronautics.〕 After the engine and aircraft were in production there were several incidents where one or two of the high pressure turbine blades failed, forcing the aircraft to make emergency landings.〔(Japan Tackles F3 engine problems ). (1989, November 29). Flight International, 16. Accessed February 4, 2010.〕 An investigation revealed that the turbine section was suffering from a vibration resonance problem, leading to the turbine blade failures. The blades were strengthened and modified to dampen the vibrations. The engine, and the aircraft, returned to service in 1990.〔(Japan finds fix for T-4 trainer ). (1990, January 17). Flight International, 27. Accessed February 4, 2010.〕 Beginning in 1999, IHI began upgrading the fielded engines with a new high pressure turbine to increase their service life. This variant of the engine was known as the ''F3-IHI-30B''.〔IHI F3. ''Jane's Aero Engines''. ((subscription page )) Edited January 13, 2009. Accessed February 9, 2010.〕 In 2003, IHI began updating the engine with a more advanced Full Authority Digital Engine Control (FADEC). This updated engine was designated the ''F3-IHI-30C''.〔 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「Ishikawajima-Harima F3」の詳細全文を読む スポンサード リンク
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