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Actually I misremembered. It was not the plug style that causes issues but the size of the exit. The change from the throw out door to the hinge version in the NG is apparently a change they made to satisfy JAA: https://www.flightglobal.com/news/articles/boeing-details-em...

Oddly enough that news bulletin says it's still a plug door which it clearly is not in the final design.

Overall the root cause I believe is generally weight of doors and evacuation time. I had a few conversations about this around the time the second accident happened and grandfather rights were brought up by people from the industry I talked to as an expensive problem for a new type rating.




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