On March 22 1992, USAir flight 405 departed from LaGuardia Airport in icy conditions and a few minutes later stalled and crash-landed, killing 27 passengers. A year later, the National Transportation Safety Board (NTSB) completed its investigation and published Aircraft Accident Report AAR-93/02 in which it concluded that the crash had been caused by a build-up of ice on the aeroplane's wings just after take-off. In spite of the fact that de-icing fluid had been applied at the gate, a departure delay after the aircraft taxied on to the runway allowed ice to re-form on the wings, leading to the crash. Shortly after that report was published, airports round the world quickly modified their protocols, de-icing aircraft just prior to take-off rather than at the gate.
1992年3月22日，全美航空公司(USAir)405次班機在嚴寒天氣下從拉瓜迪亞機場(LaGuardia Airport)起飛。幾分鐘后飛機失速并緊急著陸，導致27名乘客死亡。一年后，美國交通運輸安全委員會(NTSB)完成了對該事故的調查，發表了《飛機事故調查報告AAR-93/02》。NTSB在報告中得出結論認為，飛機墜毀是由飛機剛起飛后機翼結冰引起的。盡管在登機口已經噴灑了除冰液，但經過飛機在跑道上的滑行，加上起飛延遲，機翼重新結冰，導致了此次墜機事故。該報告發布后不久，全世界各地的機場迅速修改了規定——在起飛前而不是在登機口除冰。