# Why doesn't the pressure inside an airliner push the doors open? [duplicate]

When flying at cruise altitude, the pressure inside the aircraft is higher than outside and that means a lot of air is pushing the door outwards. So how does the door stay in place and not open?

I'm not asking if a passenger could open a door, because that's almost impossible. I'm asking how does the door not open if there is a lot of air pushing it outwards?

## marked as duplicate by SMS von der Tann, kepler22b, J Walters, David Richerby, SimonApr 2 '16 at 6:31

• I don't understand the question. Obviously doors can be opened, because people go in and out of them on the ground. If it's impossible for a passenger to open a door, what do you think is going to open the door? Most airliner doors (cargo doors generally excepted) open inwards (plug doors). Since there's a lot of force pushing the door outwards while the aircraft is pressurized, as you note, it requires a lot of force to pull the door inwards. – Zach Lipton Apr 2 '16 at 0:13
• aviation.stackexchange.com/questions/15011/… – SMS von der Tann Apr 2 '16 at 0:17
• @ZachLipton My question is: in-flight, when the cabin pressure is higher than outside, how does the door stay in place and not open? Because there is a lot of air pushing the door outwards – kepler22b Apr 2 '16 at 0:17
• What stops anything breaking when it's used? The fact that it's been designed to be used in the way that it's designed to be used. – David Richerby Apr 2 '16 at 4:35

• Most of the airline doors are plug type - not for long. Most of the current generation don't use plug doors. – Simon Apr 2 '16 at 6:40