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In the early 70s, DC-10 planes had disastrous failures with cargo doors. It proved how massive a havoc faulty cargo doors can have on the planes. Despite those two incidents with Boeing 747 planes in the 80s prove that Boeing were not careful enough to avoid problem with the cargo doors. In fact, there is a striking similarity with what happened to DC planes in 1972(a warning) and in 1974(not learned from the warning) and what happened to Boeing 747 in 1985(warning) and in 1987(not learned from warning).

Why didn't Boeing learn from what happened to DC-10 planes?

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closed as primarily opinion-based by Federico, Terry, mins, GdD, Ralph J Aug 4 '15 at 8:34

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise. If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ "Why didn't Boeing learn from what happened to DC-10 planes?". The answer will be clearly an opinion, as I doubt anyone can know what were the decisions taken at the Boeing management level, and why they were taken. $\endgroup$ – mins Aug 4 '15 at 7:04
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Most probably because the failure modes were very different. In the DC-10 case the door could appear closed even though the locking mechanism was not properly engaged. On 747 that was not a problem; instead the electric motors opening the door had enough power to break the locking mechanism if electric power somehow made it around the switch that was part of the locking mechanism.

And then, 2 years are not really enough to analyse a problem like this, develop a fix, test it and deploy it. The NTSB investigations alone often take longer than 2 years.

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