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In aviation, a tailstrike is an event in which the rear empennage of an aircraft strikes the runway. This can happen during takeoff of a fixed-wing aircraft if the pilot pulls up too rapidly, leading to the rear end of the fuselage touching the runway.〔(Preventing tailstrike at takeoff, Airbus Safety Lib )〕 It can also occur during landing if the pilot raises the nose too aggressively. This is often the result of an attempt to land nearer to the runway threshold.〔(Boeing definition of Tailstrike )〕 A tailstrike is physically possible only on an aircraft with tricycle landing gear; with a taildragger configuration, the tail is already on the ground. Some aircraft which require a high angle of attack on takeoff are fitted with small tailwheels (Concorde and the Saab Draken) or tailskids (Diamond DA20) to mitigate the effect of tailstrikes.〔(Tailstrike in Airbus Safety lib )〕 Tailstrike incidents are rarely dangerous in themselves but the aircraft must be thoroughly inspected and repairs may be difficult and expensive if the pressure hull is involved. Inadequate inspections and improper repairs to damaged airframes after a tailstrike have been known to cause catastrophic structural failure long after the tailstrike incident following multiple pressurization cycles . == Examples of notable tailstrikes == Tailstrikes on takeoff or landing: * Emirates Flight 407 * KLM Flight 4805 〔http://aviation-safety.net/database/record.php?id=19770327-1〕 Improper repairs after a tailstrike that resulted in catastrophic structural failure in a later flight: * Japan Airlines Flight 123 * China Airlines Flight 611 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「tailstrike」の詳細全文を読む スポンサード リンク
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