Originally Posted by
ManaAdaSystem
When you bend the wings, surely that will affect the body as well?
Well yes, but beyond the centre wing box probably not that much. It's possible, of course, that the reason the door let go isn't connected with the wing flexing.
The "least worst" outcome for Boeing, it terms of its effect on the development programme, would be if it turns out to be an unrelated defect with the locking system that manifested itself at 150% of max cabin diff (still not good news, of course). I'm not familiar with the 777 cargo door, but looking at photos it appears to use a fairly standard combination of C-latches and shoot-bolts, which are normally pretty robust and reliable.