Originally Posted by
DaveReidUK
It would be more accurate to say that it's impossible to open a door that initially moves inwards against a fully pressurised cabin, for obvious reasons.
Doors like those on narrow-body Airbuses, that move upwards and then outwards, are subject to different considerations. It may be that cruise diff pressure is sufficient to prevent the upwards movement of the door, but I wouldn't want to bet on that. Nor, presumably, would Asiana.
This comment is from this very thread, not far above yours.
"
Imagine trying to open a car door at 100mph...impossible. Now try opening a door 2 x the size and weight at nearly 200mph. Also impossible unless the door opens backwards"