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次班机在严寒天气下从拉瓜迪亚机场(LaGuardia Airport)起飞。几分钟后飞机失速并紧急着陆，导致27名乘客死亡。一年后，美国交通运输安全委员会(NTSB)完成了对该事故的调查，发表了《飞机事故调查报告AAR-93/02》。NTSB在报告中得出结论认为，飞机坠毁是由飞机刚起飞后机翼结冰引起的。尽管在登机口已经喷洒了除冰液，但经过飞机在跑道上的滑行，加上起飞延迟，机翼重新结冰，导致了此次坠机事故。该报告发布后不久，全世界各地的机场迅速修改了规定——在起飞前而不是在登机口除冰。