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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Heavy (aeronautics) ： ウィキペディア英語版 Heavy (aeronautics) The term ''heavy'' is used, with exceptions noted below, during all radio transmissions between air traffic control and any aircraft which has been assigned a maximum takeoff weight (MTOW) rating of or more. Aircraft with a MTOW rating between 7 t and 136 t are considered ''medium'' and aircraft with a MTOW rating less than 7 t are considered ''light''. In the US, the FAA uses a slightly different categorization. Aircraft capable of maximum takeoff weights more than and less than 300,000 pounds are considered ''large''.〔(FAA Notice N JO 7110.525 )〕 Such "heavy" aircraft over 136 t create wake turbulence from the wings. The term is mostly used around airports during take off and landing, incorporated into their call sign so as to warn other aircraft that they need extra distance to avoid this wake turbulence. All wide-body aircraft, except for the Airbus A300B1 (MTOW of , only two built and retired in 1990) and the Airbus A380 and Antonov An-225 (which are classified in the even larger category of ''super''), are thus classified as heavy. Certain variants of the narrow-bodied Boeing 707 and Douglas DC-8 also were considered "heavy" based on MTOW. Of special note here is the narrow-bodied Boeing 757. Under current guidance, the 757 is considered large, as it has a maximum MTOW of . After a number of accidents where smaller aircraft following closely behind a 757 crashed, however, the rules were changed so that controllers are required to apply the special wake turbulence separation criteria specified in paragraph 5-5-4 in the FAA guidelines for aircraft separation, as though the 757 were heavy.〔 ==References== 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「Heavy (aeronautics)」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.