kaitak744
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Lines On Top Of The Door

Mon Oct 31, 2005 10:10 am

Does anyone know what these lines are on top of each door? They all seem to at a different angle, and are present on almost all aircraft.


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EMBQA
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RE: Lines On Top Of The Door

Mon Oct 31, 2005 10:13 am

They are just rain gutters that prevent rain water from getting in the door ways when the doors are open...

[Edited 2005-10-31 02:20:44]
"It's not the size of the dog in the fight, but the size of the fight in the dog"
 
Mir
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RE: Lines On Top Of The Door

Mon Oct 31, 2005 11:05 am

Quoting EMBQA (Reply 1):
They are just rain gutters that prevent rain water from getting in the door ways when the doors are open...

 checkmark 

Not too much of an issue when using a jetway to board, but it makes a big difference when you're using open stairs.

-Mir
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ChiGB1973
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RE: Lines On Top Of The Door

Mon Oct 31, 2005 11:07 am

Makes a big difference with a jet bridge at many places. At TZ, I noticed it kept a lot of water out. They are not an exact fit in most places. Of course, could have been the bridge operator too.

M
 
EMBQA
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RE: Lines On Top Of The Door

Mon Oct 31, 2005 11:21 am

Quoting Mir (Reply 2):
Not too much of an issue when using a jetway to board

Not really true as jetways do not offer a rain tight seal.
"It's not the size of the dog in the fight, but the size of the fight in the dog"
 
jsposaune
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RE: Lines On Top Of The Door

Mon Oct 31, 2005 12:31 pm

Quoting EMBQA (Reply 1):
They are just rain gutters that prevent rain water from getting in the door ways when the doors are open...

Correct, but more specifically, they prevent de-icing fluid from running down over the doors. Type I deicing fluid, heated to upwards of 170 degrees will damage door seals. De-icers are trained to spray the top of the fuselage, not directly at the door. Those little ridges will deflect the fluid away from the sensitive areas.

Hope that helps...
(first a.net post, by the way...hello, everybody!)
There are no stupid questions....only stupid people!!!
 
kaitak744
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RE: Lines On Top Of The Door

Mon Oct 31, 2005 12:49 pm

Yup! thanks, that surely helped.

Quoting Jsposaune (Reply 5):
(first a.net post, by the way...hello, everybody!)

Welcome aboard!
 
legendDC9
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RE: Lines On Top Of The Door

Mon Oct 31, 2005 3:24 pm

Quoting Jsposaune (Reply 5):
De-icers are trained to spray the top of the fuselage, not directly at the door.

HA! That has to be one of the most optimistic comments regarding airport training I have ever heard. I would say I have seen it closer to: Here, deice this and keep it away from your nose and mouth.
 
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HAWK21M
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RE: Lines On Top Of The Door

Mon Oct 31, 2005 10:40 pm

Quoting Jsposaune (Reply 5):
first a.net post, by the way...hello, everybody

Welcome.
Amazing what a single piece of metal can achieve.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
jsposaune
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RE: Lines On Top Of The Door

Tue Nov 01, 2005 1:34 am

Quoting LegendDC9 (Reply 7):
Here, deice this and keep it away from your nose and mouth.

Hehe...I seem to remember my training a few years back...it included the question "um...you're not afraid of heights, are you?!?!"

Heck..a little type 1 never hurt anybody, as long as you don't make cocktails with it!!!
There are no stupid questions....only stupid people!!!
 
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kc135topboom
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RE: Lines On Top Of The Door

Tue Nov 01, 2005 1:39 am

Quoting Jsposaune (Reply 5):
Quoting EMBQA (Reply 1):
They are just rain gutters that prevent rain water from getting in the door ways when the doors are open...

Correct, but more specifically, they prevent de-icing fluid from running down over the doors. Type I deicing fluid, heated to upwards of 170 degrees will damage door seals. De-icers are trained to spray the top of the fuselage, not directly at the door. Those little ridges will deflect the fluid away from the sensitive areas.

Hope that helps...
(first a.net post, by the way...hello, everybody!)

That is correct, and welcome aboard.

Quoting ChiGB1973 (Reply 3):
Makes a big difference with a jet bridge at many places. At TZ, I noticed it kept a lot of water out. They are not an exact fit in most places. Of course, could have been the bridge operator too.

The jet bridge awning will also collect rain water, but often is not sealed against the aircraft, thus the gutters still are useful.
 
HPRamper
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RE: Lines On Top Of The Door

Tue Nov 01, 2005 2:42 am

On the picture of that ANA plane you can clearly see the imprints where the jetway sits against the aircraft. Very strange, the jetway must be filthy.
 
positiverate
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RE: Lines On Top Of The Door

Tue Nov 01, 2005 3:08 am

One addendum: I have been told that the gutters are positioned at the angle the airflow goes over the airframe at that point. Thusly, they provide minimal if no drag.
 
andz
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RE: Lines On Top Of The Door

Tue Nov 01, 2005 4:49 am

Quoting Positiverate (Reply 12):
One addendum: I have been told that the gutters are positioned at the angle the airflow goes over the airframe at that point. Thusly, they provide minimal if no drag.

Not sure about that, if you look closely at some aircraft you will see they angle in both directions over different doors.
After Monday and Tuesday even the calendar says WTF...
 
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HAWK21M
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RE: Lines On Top Of The Door

Tue Nov 01, 2005 5:58 pm

Quoting Positiverate (Reply 12):
I have been told that the gutters are positioned at the angle the airflow goes over the airframe at that point. Thusly, they provide minimal if no drag

Its more to do with the Aircraft Pitch on Ground & the Fuselage surface.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
474218
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RE: Lines On Top Of The Door

Tue Nov 01, 2005 11:53 pm

On the early L-1011's the rain gutters over the two forward doors were parallel with the top of the door. At some point (I don't know where) they were installed at an angle, with the front being lower than the back. This was done to improve drainage.
 
OldAeroGuy
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RE: Lines On Top Of The Door

Wed Nov 02, 2005 12:20 am

Quoting HAWK21M (Reply 14):
Its more to do with the Aircraft Pitch on Ground & the Fuselage surface.

No, it really is a reflection of the local surface streamlines in cruising flight.
Airplane design is easy, the difficulty is getting them to fly - Barnes Wallis
 
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HAWK21M
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RE: Lines On Top Of The Door

Wed Nov 02, 2005 2:08 pm


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Quoting OldAeroGuy (Reply 16):
No, it really is a reflection of the local surface streamlines in cruising flight.

I still feel its required while on Ground & not in Flight.For Eg Take the B737 Fwd Door Gutters.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
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CCA
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RE: Lines On Top Of The Door

Wed Nov 02, 2005 7:58 pm

Quoting HAWK21M (Reply 17):
I still feel its required while on Ground & not in Flight.For Eg Take the B737 Fwd Door Gutters.
regds

Exactly, it is inline with the local airflow in flight, just ask yourself where are A/C designed to be for the majority of their life on the ground or in flight?

The 747 is the perfect example to show the local airflow in flight. Door 1 from the minimal effect over the nose, Door 2 from the bow wave of the wing, Door 3 inline with the air flow over the wing, Door 4 as the flow evens out and Door 5 is even set up for the bow wave flow for the stabilizer. Even the main deck cargo door and it's negative pressure relief valve doors are done.

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You can see the local airflow dirt marks here.

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KLM seemed to have the perfect shots  Smile

Rgds CCA
P1 in A330, A340, A346, B742, B744, B748.
 
LongbowPilot
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RE: Lines On Top Of The Door

Thu Nov 03, 2005 2:47 pm

Quoting LegendDC9 (Reply 7):
HA! That has to be one of the most optimistic comments regarding airport training I have ever heard. I would say I have seen it closer to: Here, deice this and keep it away from your nose and mouth.

Maybe that is the way they do it in your country.

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