a handle moves l-shaped arms called locking sectors up against the c-latches to keep them in place. in addition, there are pins up and down both sides of the door. normally, all of this holds the door shut, but in the case of united flight 811, something goes horribly wrong. forensic analysis of the door indicated that there was actually a short circuit. it s an electrical problem that had caused unexpectedly a command to unlock the door, to actually come open. so that it was a design issue. finding that cargo door was obviously critical to answering this question. it was so critical that the national transportation safety board actually reissued the report with a different and more up-to-date cause as well as causing all 747s to be redesigned to prevent this kind of failure from occurring again. so, it was a case where the industry learned a very valuable
and the best estimate of facts at that time said he didn t close the door properly. is it human error or is there another explanation? it wasn t until a year and a half later when the navy went down and actually found the cargo door, the two pieces of the cargo door, brought them back up and they were examined. that the real cause or the true cause of the event was identified. to follow the cargo door failure on united flight 811, it s important to understand the two-snap locking system that secures 747 cargo doors. first, a series of c-shaped latches electronically rotates around pins in the bottom of the door frame. then for further reinforcement a handle moves l-shaped arms up against the c-latches to keep them in place. in addition, there are pins up and down both sides of the door.
at that time said he didn t close the door properly. is it human error or is there another explanation? it wasn t until a year and a half later when the navy went down and actually found the cargo door, the two pieces of the cargo door, brought them back up and they were examined. the real cause or the true cause of the event was identified. to follow the cargo door failure on united flight 811, it s important to understand the two-snap locking system that secures 747 cargo doors. first, a series of c-shaped latches electronically rotates around pins in the bottom of the door frame. then for further reinforcement a handle moves l-shaped arms up against the c-latches to keep them in place. in addition, there are pins up and down both sides of the door. normally all of this holds the door shut.
to the contrary, the ntsb is bound by facts. and the best estimate of facts at that time said he didn t close the door properly. is it human error or is there another explanation? it wasn t until a year and a half later when the navy went down and actually found the cargo door, the two pieces of the cargo door, brought them back up and they were examined. the real cause or the true cause of the event was identified. to follow the cargo door failure on united flight 811, it s important to understand the two-snap locking system that secures 747 cargo doors. first, a series of c-shaped latches electronically rotates around pins in the bottom of the door frame. then for further reinforcement a handle moves l-shaped arms up against the c-latches to keep them in place.
then for further reinforcement a handle moves l-shaped arms up against the c-latches to keep them in place. in addition, there are pins up and down both sides of the door. normally all of this holds the door shut. in the case of united flight 811, something goes horribly wrong. forensic analysis of the door indicated that there was actually a short circuit. it s an electrical problem that had caused unexpectedly a command to unlock the door, to actually come open. so that it was a design issue. finding that cargo door was critical to answering this question, obviously. it was so critical that the ntsb actually reissued the report with a different and more up to date cause as well as causing all 747s to be redesigned to prevent this kind of failure from occurring again. it was a case where the industry learned a very valuable lesson. the final cause, according to