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The 737 overwing exits have a non plug style door which are not permitted any more. It uses a few sensor inputs to engage a lock so you can’t open it during flight.



Do you have a source for this? From what I can find, the up-and-coming A220 has the same design[0] for the overwing exit as the 737, which was added in the 737NG redesign. Earlier 737s had plug doors: https://www.youtube.com/watch?v=2gZ22iQBlmc

0: https://rr-spotter.de/im-airbus-a220-300-von-air-baltic-nach...


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.


The issue is probably the other doors. The 737 doesn't have any sort of gas assist to help in opening the main doors in an emergency.

https://www.airliners.net/forum/viewtopic.php?t=761051


The A220 is in service today, on Delta. I flew one this afternoon.


Today I Learned... Thanks!




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