4 ms·

Source on door over wings? The brand new design A220 (Bombardier C-Series) has an over wing exit. I just couldn’t find anything in a couple of quick searches ba

Source on door over wings? The brand new design A220 (Bombardier C-Series) has an over wing exit. I just couldn’t find anything in a couple of quick searches banning it. That’s just one example though and you’re likely right. The thing is though most of these systems have modern adaptations that could be applied. They just haven’t been because of the desire to keep it a 737. They’re things that can be changed/fixed whereas the aerodynamics of the design cannot be be changed easily.

the_mitsuhiko 7y ago
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.
- bronco21016 7y ago
  Today I Learned... Thanks!
- nemetroid 7y ago
  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 https://www.youtube.com/watch?v=2gZ22iQBlmc 0: https://rr-spotter.de/im-airbus-a220-300-von-air-baltic-nach-riga/a220_safetycard/ https://rr-spotter.de/im-airbus-a220-300-von-air-baltic-nach...
  - inferiorhuman 7y ago
    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 https://www.airliners.net/forum/viewtopic.php?t=761051
  - the_mitsuhiko 7y ago
    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-emergency-exit-on-new-737-21088/ 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.
  - epc 7y ago
    The A220 is in service today, on Delta. I flew one this afternoon.
joe_the_user 7y ago
The 737 Max "still" uses paper manuals for technical support and has a variety of features no longer found in modern planes. "It is the only modern Boeing jet without an electronic alert system that explains what is malfunctioning and how to resolve it. Instead pilots have to check a manual." https://theworldnews.net/au-news/paper-manuals-and-1960s-design-why-the-boeing-737-max-is-not-a-good-airplane-for-the-current-environment https://theworldnews.net/au-news/paper-manuals-and-1960s-des...
- lathiat 7y ago
  This scares me far more than the MCAS issue generally to be honest. The fact that all this modern technology is being thrown out for economics and we’re basically building 50 year old planes en masse. It makes me very sad.
  - RhodesianHunter 7y ago
    Oh boy... Wait till you learn about the backbone of our military air forces.

the_mitsuhiko 7y ago

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.

bronco21016 7y ago
Today I Learned... Thanks!
nemetroid 7y ago
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 https://www.youtube.com/watch?v=2gZ22iQBlmc 0: https://rr-spotter.de/im-airbus-a220-300-von-air-baltic-nach-riga/a220_safetycard/ https://rr-spotter.de/im-airbus-a220-300-von-air-baltic-nach...
- inferiorhuman 7y ago
  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 https://www.airliners.net/forum/viewtopic.php?t=761051
- the_mitsuhiko 7y ago
  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-emergency-exit-on-new-737-21088/ 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.
- epc 7y ago
  The A220 is in service today, on Delta. I flew one this afternoon.

joe_the_user 7y ago

The 737 Max "still" uses paper manuals for technical support and has a variety of features no longer found in modern planes. "It is the only modern Boeing jet without an electronic alert system that explains what is malfunctioning and how to resolve it. Instead pilots have to check a manual." https://theworldnews.net/au-news/paper-manuals-and-1960s-design-why-the-boeing-737-max-is-not-a-good-airplane-for-the-current-environment https://theworldnews.net/au-news/paper-manuals-and-1960s-des...

lathiat 7y ago
This scares me far more than the MCAS issue generally to be honest. The fact that all this modern technology is being thrown out for economics and we’re basically building 50 year old planes en masse. It makes me very sad.
- RhodesianHunter 7y ago
  Oh boy... Wait till you learn about the backbone of our military air forces.