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Airliner Door Questions  
User currently offlineUA752 From United States of America, joined Jan 2001, 142 posts, RR: 2
Posted (13 years 4 months 1 week 3 days 2 hours ago) and read 1043 times:

Ive noticed that on most airliners there is some sort of "strip" of metal that proceeds diagonaly along the fuselage...what is this and what's its purpose?

Also I have noticed that on lots of jets that the metal directly below the door is not painted...why is that?

Heres a good example of what Im talking about...


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Photo © Bill Paulsen



Thanks

MSN


6 replies: All unread, jump to last
 
User currently offlineFlight152 From United States of America, joined Nov 2000, 3413 posts, RR: 6
Reply 1, posted (13 years 4 months 1 week 3 days 2 hours ago) and read 1012 times:

It channels the water around the door so the passnegers don't get wet when leaving/boarding the plane. Kinda like a gutter, in fact my mom's Volvo S90 has them too!

User currently offlineJSchultz From United States of America, joined Oct 2000, 9 posts, RR: 0
Reply 2, posted (13 years 4 months 1 week 3 days 2 hours ago) and read 1012 times:

That metal strip at the bottom of the door is a scuff plate. They aren't painted for obvious reasons...(Jetways, boarding stairs bump up against them).

Jim


User currently offlineUA752 From United States of America, joined Jan 2001, 142 posts, RR: 2
Reply 3, posted (13 years 4 months 1 week 3 days 2 hours ago) and read 1001 times:

hmm....simpler than I thought...thanks again

MSN


User currently offlineMusang From United Kingdom, joined Apr 2001, 872 posts, RR: 7
Reply 4, posted (13 years 4 months 1 week 3 days 1 hour ago) and read 996 times:

Those rain gutters above the doors are, on some types, angled to align with the local airflow, to cause less drag.

Therefore you might see one at a forward door sloping down towards the front, and one on a rear door sloping down towards the rear. On other types they're all horizontal.

To get an illustration of the direction of flow along a fuselage, look for one with toilet fluid leaking from the forward servicing panel!

Regards - Musang


User currently offlineKlaus From Germany, joined Jul 2001, 21521 posts, RR: 53
Reply 5, posted (13 years 4 months 1 week 3 days ago) and read 982 times:

UA752: Also I have noticed that on lots of jets that the metal directly below the door is not painted...why is that?

Another possible explanation is given here: http://www.concordesst.com/model102/pop9.html

I don´t know if this problem is also relevant on subsonic planes; But helicopter rotors are known to pick up static electricity while they are moving through the air.

So this unpainted area below the airbus door might be used to discharge the fuselage in a controlled way in order to spare an unsuspecting passenger...
Seems a little small for mechanical protection.

Do jetways usually have brush contacts in this area?


User currently offlineNotar520AC From United States of America, joined Jul 2001, 1606 posts, RR: 4
Reply 6, posted (13 years 4 months 1 week 2 days 19 hours ago) and read 958 times:

"Helicoper rotors tend to pick up static..."

Yes- they do. From a helicopter pilot, we have static discharge areas aft and fore on the fuselage. They're very small though- only about the size of a half dollar and are never covered.



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