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An Examination of Survival Rates Based on External Flotation Devices: A Helicopter Ditching Review from 1971 to 2005

机译：基于外部浮选设备的成活率检验：1971年至2005年的直升机起降审查

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摘要

The data set consists of 511 helicopter ditching cases in which we could determine the number of occupants, the final position of the aircraft, the presence of external flotation devices and the number of surviving occupants. The final position of the helicopters indicated that 56 floated upright, 326 inverted with 156 of those sinking. It appears that helicopters that invert and sink significantly reduce the survivability rate of the occupants (p < .001). In addition, 298 of the helicopters were equipped with external flotation devices, while 109 did not have flotation devices. External flotation devices appear to assist in keeping the helicopters floating on the surface of the water (p < .005). However, it is not clear that survivability in helicopters with external flotation devices is higher than without the devices. This result may be partially due to the fact that approximately 46.5% of all helicopter ditching events involve the helicopter sulking. The results also indicate that 42% of helicopters fitted with external flotation devices still sank. It appears that installation of external flotation devices alone is not sufficient to result in a higher level of survivability following a helicopter ditching.
机译：该数据集由511架直升机开沟案例组成，在这些案例中，我们可以确定乘员人数，飞机的最终位置，外部漂浮装置的存在以及幸存的乘员数量。直升机的最终位置表明，有56架直升飞机漂浮，有326架倒置，有156架下沉。看来，倾倒和下沉的直升机会大大降低乘员的生存率（p <.001）。此外，有298架直升机配备了外部漂浮装置，而109架没有漂浮装置。外部浮选装置似乎有助于使直升机保持漂浮在水面上（p <.005）。但是，尚不清楚具有外部漂浮装置的直升机的生存能力是否高于没有外部漂浮装置的直升机。该结果可能部分归因于所有直升机降落事件中大约46.5％涉及直升机俯冲的事实。结果还表明，装有外部漂浮装置的直升飞机仍有42％沉没。似乎仅安装外部浮选装置不足以在直升机抛弃之后导致更高的生存能力。

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