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Yakovlev Yak-40
The Yakovlev Yak-40 (NATO reporting name: Codling) is a small, three-engined airliner. It is the world's first commuter trijet. Maiden flight was made in 1966, and production took place from 1967 to 1981. Introduced in September 1968, the Yak-40 was exported since 1970.
==Development==
By the early 1960s, the Soviet state airline Aeroflot's international and internal trunk routes were flown by jet or turboprop powered airliners but their local services, many of which operated from grass airfields, were operated by obsolete piston engined aircraft such as the Ilyushin Il-12, Il-14 and Lisunov Li-2.〔Stroud 1968, p. 269–270.〕 Aeroflot wanted to replace these elderly airliners with a turbine-powered aircraft, with the Yakovlev design bureau being assigned to design the new airliner. High speed was not required, but it would have to operate safely and reliably out of poorly equipped airports with short (less than 700 m, (2,300 ft)) unpaved runways in poor weather.〔Gunston and Gordon 1997, p. 185.〕
Yakovlev studied both turboprop and jet-powered designs to meet the requirement, including Vertical Take-Off and Landing (VTOL) designs with lift jets in the fuselage or in wing-mounted pods, but eventually they settled on a straight-winged tri-jet carrying 20 to 25 passengers. Engines were to be the new AI-25 turbofan being developed by Ivchenko at Zaporozhye in Ukraine.〔Gunston and Gordon 1997, pp. 185–186.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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