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What Are The Small Bars On Top Of Doors?  
User currently offlineKeta From Germany, joined Mar 2005, 448 posts, RR: 0
Posted (8 years 3 months 1 week 2 days 6 hours ago) and read 5110 times:

I don't know how to call them... You may see it clearer with a picture the small "bars" located in top of airliners' doors:


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Photo © Ben Wang



I hope you see what I mean. Are they some structural thing? They don't look like aerodynamic devices at least. What are they?


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8 replies: All unread, jump to last
 
User currently offlineDavid L From United Kingdom, joined May 1999, 9523 posts, RR: 42
Reply 1, posted (8 years 3 months 1 week 2 days 6 hours ago) and read 5107 times:

To stop rain water running down into the doorway?

Quoting Keta (Thread starter):
don't look like aerodynamic devices

Although they're not there for aerodynamic reasons I'll bet they're aligned to reduce any aerodynamic penalties.


User currently offlineBuzz From United States of America, joined Nov 1999, 697 posts, RR: 22
Reply 2, posted (8 years 3 months 1 week 2 days 5 hours ago) and read 5103 times:

Hi KETA, Buzz here. Those are "rain gutters" to channel rivulets of rain away from the cabin doors as the rain rolls down from the top of the fuselage.
It seemed that the DC-10's "rain gutters" didn't work as well as the Boeing 727 / 737... at least in "sunny" Portland Oregon (it tends to rain here). I'd joke that the DC-10 was designed in southern California... sunny warm weather.
g'nite


User currently offlineZkpilot From New Zealand, joined Mar 2006, 4801 posts, RR: 9
Reply 3, posted (8 years 3 months 1 week 2 days 5 hours ago) and read 5097 times:

They are there to stop rain dripping onto passengers or onto the floor of the aircraft when the door is open for boarding/deboarding.
They are aligned so as to be as little drag penalty as possible... since most aircraft fly with a slight nose up attitude, the rails are angled downwards at the front so inflight they are almost level.



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User currently offlineRichardPrice From , joined Dec 1969, posts, RR:
Reply 4, posted (8 years 3 months 1 week 1 day 21 hours ago) and read 4969 times:

This came up in a previous thread, its a gutter to direct deicing fluid away from the doors as it can damage the door seals.

User currently offlineGrandTheftAero From United States of America, joined Nov 2003, 254 posts, RR: 5
Reply 5, posted (8 years 3 months 1 week 1 day 17 hours ago) and read 4912 times:

Quoting Zkpilot (Reply 3):
since most aircraft fly with a slight nose up attitude, the rails are angled downwards at the front so inflight they are almost level.

I believe they are angled to be tangent with the circulation about the wing since the gutters aft of the wing are angled in the opposite direction.


User currently offlineKeta From Germany, joined Mar 2005, 448 posts, RR: 0
Reply 6, posted (8 years 3 months 1 week 1 day 9 hours ago) and read 4845 times:

Hehe I never thought it was for that. Thanks for the replies!  Smile


Where there's a will, there's a way
User currently offlineNZ1 From New Zealand, joined May 2004, 2248 posts, RR: 25
Reply 7, posted (8 years 3 months 6 days 9 hours ago) and read 4633 times:
AIRLINERS.NET CREW
FORUM MODERATOR

The thing is, they are bloody useless in normal ops. The water just spills over the top. Speaking from experience.

NZ1


User currently offlineDavid L From United Kingdom, joined May 1999, 9523 posts, RR: 42
Reply 8, posted (8 years 3 months 6 days ago) and read 4560 times:

Quoting NZ1 (Reply 7):
The thing is, they are bloody useless in normal ops. The water just spills over the top. Speaking from experience.

You need someone to clean out the leaves from time to time.


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