AR1300
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Thingy At The Door

Sun Mar 20, 2005 1:05 pm

What is that thing on top af almost every ac door?You know what I'm talking about? that 'line' thing...

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Mike
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Salukipilot
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RE: Thingy At The Door

Sun Mar 20, 2005 1:08 pm

I may not be the most accurate of sources but I think its to deflect rain away from the doorway when there is no jetway attached. I.e. when there is the galley service truck or in the even of an evacuation in the rain. That's just my $.02  Wink

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darrell
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RE: Thingy At The Door

Sun Mar 20, 2005 1:08 pm

I believe its a miniature gutter, to keep rain from dripping onto your head when you walk through the door. Feel free to correct me if I'm wrong.
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NWAFA
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RE: Thingy At The Door

Sun Mar 20, 2005 1:10 pm

No its not that, trust me I have had my share of rain come down on me!!

My "GUESS" would be a buckle zone..kind-of like on a car.
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TransatGuy
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RE: Thingy At The Door

Sun Mar 20, 2005 1:10 pm

Its there so that rain doesent drip down the aircraft door, instead it goes down the "line thingy" and onto one side away from embarking/disembarking passengers.
 
AR1300
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RE: Thingy At The Door

Sun Mar 20, 2005 1:14 pm

I thought that too....but it doesn't look like helping a lot...

Mike.
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airgeek12
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RE: Thingy At The Door

Sun Mar 20, 2005 1:15 pm

I think it's pretty much like a rain-gutter kinda thing. I've seen 'em a rew time. When it's rained water can still make it's way through the gap between the a/c and the jetway so it kinda deflects the water to the side.
 
PhilSquares
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RE: Thingy At The Door

Sun Mar 20, 2005 1:38 pm

Trust me, it's a rain gutter. On the 400 they're at all the main deck doors. If they were some type of "buckle zone" they would be at the upper deck doors. If you look, they're absent from there.
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dl757md
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RE: Thingy At The Door

Sun Mar 20, 2005 11:48 pm

Quoting NWAFA (Reply 3):
No its not that, trust me I have had my share of rain come down on me!!

My "GUESS" would be a buckle zone..kind-of like on a car.

It's called a drip rail(rain gutter). Trust ME, I've replaced my share of them. It isn't there for the absence of a jetway as the rain will pretty much come in the door anyway. It does route water running down the fuselage away from the door. The canopy on the jetway doesn't make a water tight seal so the drip rail keeps most of this water from reaching the canopy.

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OPNLguy
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RE: Thingy At The Door

Mon Mar 21, 2005 2:44 am

Quoting Dl757md (Reply 8):
Trust ME, I've replaced my share of them.

I've always been curious; how are they attached? Welded? Rivets? Glue?
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dl757md
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RE: Thingy At The Door

Mon Mar 21, 2005 7:51 am

Quoting OPNLguy (Reply 9):
I've always been curious; how are they attached? Welded? Rivets? Glue?

They are attached with solid rivets, which are shot on wet(with sealer), and sealer between the rail and the fuselage. They are then edge sealed with an aerodynamic seal.

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jetBlue
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RE: Thingy At The Door

Mon Mar 21, 2005 9:38 am

I wondered that a lot when I first saw 777s, and noticed most planes had them. When I got up close and noticed it, I found it funny how quickly it's purpose came to mind. It was like, "Oh! It's to deflect water from falling into the cabin!"  Smile

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OPNLguy
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RE: Thingy At The Door

Mon Mar 21, 2005 9:47 am

Quoting Dl757md (Reply 10):
They are attached with solid rivets, which are shot on wet(with sealer), and sealer between the rail and the fuselage. They are then edge sealed with an aerodynamic seal.

Thanks kindly...  Wink
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CCA
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RE: Thingy At The Door

Mon Mar 21, 2005 10:08 am

The best part, that no one has mentioned, is that they are aligned with the relative airflow so they have the least amount of drag, and the pic shows it perfectly.

Rgds CCA
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ua777222
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RE: Thingy At The Door

Mon Mar 21, 2005 12:49 pm

Here's a pic that I took that actually just got rejected but I'll revamp it until its a.net needs but you can see that it is clearly doing its job over the door of this United 777-222;

http://img.photobucket.com/albums/v626/ua777222/N214UA_SFO_03120522.jpg

It was this picture that made me think about this same question but was afraid of getting flamed for my lack of the "simple things". Glad to hear its what I thought and that it isn't "as simple" as CCA has pointed out.

Thanks,

Matt
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HAWK21M
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RE: Thingy At The Door

Mon Mar 21, 2005 1:10 pm

Its a Type of Rain Gutter,to avoid Water fall over the Top of the door cutout & into the Aircraft.
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MEL
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