Originally Posted by
EXDAC
I was thinking that there is a tapped hole in each upper guide fitting and the headless screw lies just under the fuselage side guide pin. Any upward movement of the door would be blocked by contact of the screw and the guide pin. (To be clear - this is speculation.)
Yes I think we are on the same page on that bolt/screw under the pin. I had read elsewhere in the thread that someone had suggested that there was a tapped hole in the actual pin that could show evidence of a surface defect indicating a snapped bolt.
I agree all speculation. But on the face of it there doesn't seem to be much redundancy or a clear flag/indicator that the door.is flight ready and secure like the normal human operated doors.