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The critical engine of a multi-engine, fixed-wing aircraft is the engine whose failure would most adversely affect the performance or handling abilities of an aircraft(§1.1). On propeller aircraft, there is a difference in the remaining yawing moments after failure of the left or the right (outboard) engine when all propellers rotate in the same direction due to the P-factor. On turbojet/ turbofan aircraft, there usually is no difference between the yawing moments after failure of a left or right (outboard) engine. == Description == When one of the engines on a typical multi-engine aircraft becomes inoperative, a thrust imbalance exists between the operative and inoperative sides of the aircraft. This thrust imbalance causes several negative effects in addition to the loss of one engine's thrust. During the design phase of the aircraft, the tail design engineer sizes the vertical stabilizer/ tail to comply with the controllability and performance requirements after engine failure in Aviation Regulations. During the experimental flight test phase of a multi-engine aircraft, the Experimental Test Pilot and Flight Test Engineer determine which of the engines is the critical engine. Definitions of the critical engine can also be found in Flight Test Guides for Part 23 and Part 25 airplanes, issued by the FAA〔(【引用サイトリンク】title=Advisory Circular 23-8C, Flight Test Guide )〕〔(【引用サイトリンク】title=Advisory Circular 25-7B. Flight Test Guide )〕 and by EASA.〔(【引用サイトリンク】title=Certification Specification 23 Flight Test Guide )〕 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「critical engine」の詳細全文を読む スポンサード リンク
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