国际民航组织1959～1994年飞行事故调查统计表明,着陆阶段是飞行事故的多发阶段。按不同飞行阶段的统计,加载、滑行、减载阶段的事故率只占2％;起飞阶段的事故率占14.4％;初始爬升段占10.4％;爬升段占6.9％;巡航段占4.4％;下降段占7.2％;起始进近段占11.3％;五边进近阶段的事故率占24.2％;接地段占19.2％。其中五边进近和接地阶段的时间只有 The statistics of the ICAO flight accidents from 1959 to 1994 show that the landing phase is the multiple stages of a flight accident. According to the statistics of different flight stages, the accident rate of loading, taxiing and unloading is only 2%; the accident rate of takeoff stage is 14.4%; the initial climb is 10.4%; the climb is 6.9%; the cruise is 4.4% The descending segment accounted for 7.2%; the initial approach segment accounted for 11.3%; the accident rate in the five-way approach phase accounted for 24.2%; the earth segment accounted for 19.2%. Five of the five stages of approach and grounding are the only ones