In response to this thread. Can Aircraft Doors Be In Open In The Air. (by Djmatthews Aug 15 2004 in Tech Ops)
It has been bugging me for day. How many times does this question have to be asked.
An aircraft door can not be opened, while in the air, or the cabin is pressurised. The reason for this is because the hole in the fuselage is smaller than the door it self.
The door fits through the hole because there are sections of the door that fold in on them self's. They are at the top and bottom of the door. The fold in on them self's when the hand on the door is turned or lifted, depending on the type of aircraft.
The reason it does not open in the air, is because of the door being bigger than the hole. This means that when the aircraft is pressurised and the aircraft is several thousand feet in the air. The pressure is differant and the aircraft's door is being pushed, by the pressure against the fuselage, so it can't be opened.
I hope you can understand this, and this thread is for reference when people search for this topic.