1971年9月13日,林彪等人叛逃的“九一三”事件,震惊中外。作为我党历史上的重大事件,除载着林彪的256三叉戟飞机坠毁在蒙古外,还有一架3685直升机被迫降在北京怀柔地区,已经有大量文章披露256三叉戟飞机坠毁的真相,但3685直升机是如何被“偷”走的?北京沙河机场的那一夜发生了什么?直升机迫降现场又发生了怎样惊心动魄的一幕?40年过去了,历史的真相逐渐被岁月的烟尘蒙上了一层神秘的面纱。时隔事件40年,笔者采访了当时多位当事人,从他们的视角回顾了这一历史事件…… On September 13, 1971, Lin Biao and others defected from the “September 13” incident, which shocked both China and foreign countries. As a major event in our party’s history, except for the 256 Trident plane carrying Lin Biao crashed outside Mongolia, there was also a 3685 helicopter forced to land in Huairou, Beijing. There have been numerous articles disclosing the truth of the 256 Trident plane crash, but 3685 How the helicopter was “stolen”? What happened that night in Beijing’s Shahe airport? Helicopter landing scene and what happened to the soul-stirring scene? 40 years later, the truth of history is gradually cast over the years of dust Layer mysterious veil. After a lapse of 40 years, I interviewed many parties at that time and reviewed the historical events from their perspectives.