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军用直升机以其良好的机动性、隐蔽性以及突击能力和强大的火力装备,在现代化战争中起了重要作用。但由于直升机结构特点,座舱环境十分恶劣,飞行员经常在高噪声、强振动、高低温等环境因素下作高难度飞行,极易引起疲劳。据美国陆军统计,1971～1977年间因飞行疲劳造成直升机飞行事故42次,死亡51人、伤63人。同期固定翼飞机事故仅10次,死亡3人,伤5人。各国对直升机救生曾相继提出许多离机方案,如切除旋翼向上弹射,水平弹射、牵引救生、降落伞锥等。但是由于巨大旋翼位于直升机上方,实施都比较困难。
With its good maneuverability, concealment and assault capability and powerful firepower, the military helicopters played an important role in the modern war. However, due to the structural characteristics of helicopters, cockpit environment is very poor, pilots often in high noise, strong vibration, high temperature and other environmental factors for difficult flight, can easily lead to fatigue. According to the statistics of the U.S. Army, helicopter flying accidents were caused by flight fatigue between 1971 and 1977 with 42 deaths, 51 deaths and 63 injuries. Fixed-wing aircraft accident over the same period only 10 times, 3 people were killed and 5 injured. Various helicopter lifesaving countries have successively proposed many off-plan solutions, such as removal of rotor ejection, horizontal ejection, traction life-saving, parachute cone and so on. However, due to the huge rotor located above the helicopter, the implementation is more difficult.