Why Soviet aircraft doors opened inward (5 photos)

Not everyone, but the passenger sides of the 1950-1960s. And then the design changed.





There is not so much space inside the plane, so open the door inside is just uncomfortable. However, the designers proceeded from the fact that altitude, the pressure outside the aircraft is much less than in the cabin. So the door cannot open under any circumstances and the aircraft cannot danger of depressurization.

So the engineering thought was sound: the greater the pressure difference, the more the door closed.



But Western manufacturers took a different path - they have doors opened out. They motivated it in the first place, security. Expert groups met and they considered that passengers behave sometimes irrationally. If an emergency occurs situation and it will be necessary to leave the board - they will create a real mess for doors.

If the door opens inwards, and there are crowds of people and rear rows press on the front, then they may simply not open it. And this sounds logical.





It is believed that Western aircraft manufacturers have carried out a series of psychological experiments on people's behavior in extreme situations. And after that they made conclusions about the design of the doors. And by about the pressure difference outside and inside the cabin, they acted simply - Strengthened the locks on the doors.

But Soviet engineering thought did not stand still - appeared IL-62. His doors also opened inward, while the mechanism is larger like a slider. The doors did not open wide open, but moved inward and to the side. It was an intermediate option.



Well, in the 1970s, the situation changed - they developed the Tu-154. At the doors were already opening outwards. With this model, the engineers abandoned old door opening design. And a problem with a possible depressurization was decided in the same way as in the west - they strengthened the shut-off mechanisms.