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MD Helicopters, Inc. is an American aerospace manufacturer that produces helicopters primarily for commercial use. Coverage here includes the company's tenure as McDonnell Douglas Helicopter Systems, a subsidiary of McDonnell Douglas. ==Background== The company began in 1947 as a unit of Hughes Aircraft, then was part of the Hughes Tool Company after 1955. It became the helicopter division of Hughes' Summa Corporation in 1972,〔(【引用サイトリンク】work = Post-War Developments: 1946-1956 )〕 and was finally reformed as Hughes Helicopters, Inc. in 1981. However, throughout its history, the company was informally known as Hughes Helicopters. The company was sold to McDonnell-Douglas in 1984. Hughes Helicopters produced three major designs during its 37-year history. The Model 269/300 was Hughes' first successful helicopter design.〔(【引用サイトリンク】publisher=SpruceGoose.org )〕 Built in 1956, and entering production in 1957, it would eventually become part of the Army inventory as a primary trainer, designated TH-55 Osage. In 1983, the company licensed Schweizer Aircraft to produce the Model 300C, which Schweizer continues to produce to this day. In May 1965, the company won the contract for a new observation helicopter for the U.S. Army, and produced the OH-6 Cayuse (Hughes Model 369).〔(【引用サイトリンク】publisher=Boeing )〕 The OH-6 was later developed into the civilian Model 500, variants of which remain in production to this day. In 1975, the company won the contract for the AH-64 Apache attack helicopter.〔(【引用サイトリンク】title=The Boeing Logbook: 1971-1976 )〕 By December 1981, six AH-64A prototypes had been built and the Army had awarded a production contract to the company.〔(【引用サイトリンク】title=The Boeing Logbook: 1977-1982 )〕 Production would reach more than 1,100 by 2005. 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「MD Helicopters」の詳細全文を読む スポンサード リンク
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