Originally Posted by
ScouseJon
I will dig the AMM out if you are really interested, but there is a slight inward movement on the door before it moves upwards from the stops.
Yes, having had a closer look at some clips of door opening from the outside, I see that there is a barely detectable inward movement (appears to be about one millimeter) before the door starts to lift. Obviously, given that the door is supposedly flush with the fuselage skin when closed, it can't move significantly inwards and then immediately upwards (unless it's an L1011-type door that retracts into the ceiling).
So the $64K question is whether, even with a modest amount of cabin pressure hindering that mm of inward movement, it's still possible to graunch the door up while overcoming the friction between the stops until it's free to move outwards, at which point the actuator takes over and drives the door forwards.
No doubt other explanations for what happened are available.
I would indeed be interested in seeing the AMM.