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Opening Overwing Exit In Flight.  
User currently offlineErasmus From Italy, joined Jun 2007, 0 posts, RR: 0
Posted (12 years 4 months 2 weeks 13 hours ago) and read 2023 times:

I was reading this thread in the civil aviation forum:
http://www.airliners.net/discussions/general_aviation/read.main/791879/

Of course I know that an overwing can't be opened when there is a big differential pressure.

But what if the aircraft is at very low altitude and at very low differential pressure?

How much differential pressure should there be, to prevent an adult from opening a typical overwing exit?

6 replies: All unread, jump to last
 
User currently offlineJsuen From United States of America, joined Aug 2001, 211 posts, RR: 0
Reply 1, posted (12 years 4 months 2 weeks 13 hours ago) and read 1974 times:

The smallest exit allowed by the FAA is 19 inches by 26 inches, or 494 square inches. If an adult can exert 250 pounds, about 0.5 psi. That's around 1,000 feet.

User currently offlineDelta-flyer From United States of America, joined Jul 2001, 2676 posts, RR: 6
Reply 2, posted (12 years 4 months 2 weeks 7 hours ago) and read 1922 times:

But doesn't the cabin pressurize while still on the ground, so there is always a differential pressure? How much differential pressure are fuselages designed for, anyway?

Pete


User currently offlineAir2gxs From , joined Dec 1969, posts, RR:
Reply 3, posted (12 years 4 months 2 weeks 6 hours ago) and read 1909 times:

Most aircraft types are rated for 8.5 to 9.5 psid. It just depends on the aircraft type. Also some aircraft beginning pressurization on the ground but it isn't really that much, probably arourd .25 psid as the aircraft screams down to the runway. Any more than that on the ground and the pax start feeling it.

User currently offlineDelta-flyer From United States of America, joined Jul 2001, 2676 posts, RR: 6
Reply 4, posted (12 years 4 months 1 week 6 days 7 hours ago) and read 1830 times:

Thanks air2gxs

Pete  Smile


User currently offlineDc10hound From United States of America, joined Dec 2000, 463 posts, RR: 5
Reply 5, posted (12 years 4 months 1 week 5 days 15 hours ago) and read 1787 times:

>>Also some aircraft beginning pressurization on the ground but it isn't really that much, probably arourd .25 psid as the aircraft screams down to the runway. Any more than that on the ground and the pax start feeling it<<

It's called "Pre-Pressurization". When the throttles are advanced, the Cabin Outflow Valve(s) modulate towards the closed position. Sometimes you can feel it.



"Eagles soar. But weasels never get sucked into jet intakes.."
User currently offlineContact_tower From Norway, joined Sep 2001, 536 posts, RR: 1
Reply 6, posted (12 years 4 months 1 week 5 days 14 hours ago) and read 1777 times:

The airliners with outwards opening exits (like the B737) has bolt locks that activate when the engines are running or something like that.

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