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A controlled flight into terrain (CFIT, usually pronounced "''see-fit''") is an accident in which an airworthy aircraft, under pilot control, is unintentionally flown into the ground, a mountain, a body of water or an obstacle. In a typical CFIT scenario, the crew is unaware of the impending disaster until too late. The term was coined by engineers at Boeing in the late 1970s.〔()〕 Accidents where the aircraft is out of control at the time of impact, because of mechanical failure or pilot error, are not considered CFIT (they are known as ''uncontrolled flight into terrain''), nor are accidents resulting from the deliberate action of the person at the controls, such as acts of terrorism or suicide by pilot. According to Boeing, CFIT is a leading cause of airplane accidents involving the loss of life, causing over 9,000 deaths since the beginning of the commercial jet age.〔(【引用サイトリンク】title=Boeing )〕 CFIT was identified as a cause of 25% of USAF Class A Mishaps between 1993 and 2002.〔Air Force Magazine, February 2004, Published by Air Force Association, 1501 Lee Highway, Arlington, VA 22209-1198, USA.〕 ==Causes== While there are many reasons why a plane might crash into terrain, including bad weather and navigation equipment problems, pilot error is the most common factor found in CFIT accidents.〔 The most common type of pilot error in CFIT accidents is the failure of pilots to know at all times what their position is, and how their actual position relates to the altitude of the surface of the Earth below and immediately ahead, on the course they are flying (a loss of situational awareness). Fatigue can cause even highly experienced professionals to make significant errors, which culminate in a CFIT accident.〔(Parmet, AJ and Ercoline, WR, Chapter 6, Spatial Orientation in Flight. In Fundamentals of Aerospace Medicine, 4th Edition, 2008, Davis, Johnson, Stepanek and Fogarty, Eds. Lippincott Williams & Wilkins)〕 CFIT accidents frequently involve a collision with terrain such as hills or mountains during conditions of reduced visibility, while conducting an approach to landing at the destination airport. Sometimes a contributing factor can be subtle navigation equipment malfunctions which, if not detected by the crew, may mislead them into improperly guiding the aircraft, despite other information received from properly functioning equipment. 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「Controlled flight into terrain」の詳細全文を読む スポンサード リンク
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