I never understood exit door standards. . .when to have less. . .when to have more. . .widebody or narrowbody. . .how does someone determine these necessary, or unnecessary? I do know it has a lot to do with emergency drill times for the pax to deplane. . .but just look at that DC-8! C'mon. . .what gives?
Was it different during the DC-8 production era compare to now? I think there are probably other examples of a/c that are similar to hte DC-8 example.
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PiedmontGirl From United States of America, joined Nov 2003, 1124 posts, RR: 13 Reply 4, posted (9 years 11 months 3 days 6 hours ago) and read 2823 times:
There are several reasons for this. For one thing, the FAA standards on how far apart the exits could be changed. Also, the materials that the slides are made of became tougher and the inflation mechanisms of the slides became more reliable.
Also, the slides on the big birds like 74s are double width. You can send two people at a time down side by side. The slides on the DC-8s were single width, just like the slides on 737s, 312s and what not.
Ultrapig From United States of America, joined exactly 10 years ago today! , 564 posts, RR: 0 Reply 5, posted (9 years 11 months 3 days 6 hours ago) and read 2800 times:
I believe that there must be sufficient doors for the full load to exit within 90 seconds with 3/4 of the doors operating. I may be off on the actual numbers but if you are as old as I you will remember that when the 747 was about to be certified there was a picture in the press of 490 boeing employees each with a numbered vest having a grand time sliding off shoots in certitification tests.
NorthStarDC4M From Canada, joined Apr 2000, 2903 posts, RR: 39 Reply 6, posted (9 years 11 months 3 days 6 hours ago) and read 2797 times:
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you have to remember its not the number of seats per exit, its the time it takes to get all the passengers and crew out through half of them. Narrow body aircraft tend to have more exits per passenger because the single aisle slows down movement in the cabin. Also most of the time, there are more seats per row per aisle on a narrowbody than on a widebody (narrowbody will be 5 or 6, widebody 4 or 5). The more per row, the less room there is in the aisle, the longer it takes everyone to get to an exit.
I recall a story i heard once, about back when the 747 was entering service, Boeing demonstrated a 747 and 707 evacuation side by side. They used 4 exits on the 747, and all 8 on the 707. With 150 on the 707 and 450 on the 747, everyone was off the 747 10 seconds before the last was off the 707.
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PiedmontGirl From United States of America, joined Nov 2003, 1124 posts, RR: 13 Reply 7, posted (9 years 11 months 3 days 6 hours ago) and read 2764 times:
I believe that there must be sufficient doors for the full load to exit within 90 seconds with 3/4 of the doors operating.
You numbers are correct. When an airplane is certified it is within 90 seconds with 3/4 of the exits operational. Also, when an airline is getting ready to put an airplane into operation, they have to demonstrate the carrier's ability to hit those numbers.
Flashmeister From United States of America, joined Apr 2000, 2892 posts, RR: 7 Reply 8, posted (9 years 11 months 3 days ago) and read 2571 times:
Isn't it true that the number of doors isn't really relevant, but the number of paths out doors that's measured (along with distance, time, etc.)? Meaning that if you have bigger doors that can accomodate 2 people at once, that counts as two paths, where a slimmer door that's single-person-at-once is only 1?
My understanding was that the paths out the door play a bigger role than the number of aisles, seats per aisle, etc.