What Are The Small Bars On Top Of Doors? — Tech Ops Forum

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What Are The Small Bars On Top Of Doors?

Keta From Germany, joined Mar 2005, 438 posts, RR: 0
Posted (6 years 1 month 5 days 15 hours ago) and read 3037 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 © Florian Sindermann

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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?

Where there's a will, there's a way

8 replies: All unread, jump to last

David L From United Kingdom, joined May 1999, 8994 posts, RR: 44
Reply 1, posted (6 years 1 month 5 days 15 hours ago) and read 3034 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.

Buzz From United States of America, joined Nov 1999, 697 posts, RR: 28
Reply 2, posted (6 years 1 month 5 days 14 hours ago) and read 3030 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

Zkpilot From New Zealand, joined Mar 2006, 4572 posts, RR: 12
Reply 3, posted (6 years 1 month 5 days 14 hours ago) and read 3024 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.

52 types. 32 countries. 23 airlines.

RichardPrice From , joined Dec 1969, posts, RR:
Reply 4, posted (6 years 1 month 5 days 6 hours ago) and read 2896 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.

GrandTheftAero From United States of America, joined Nov 2003, 254 posts, RR: 6
Reply 5, posted (6 years 1 month 5 days 2 hours ago) and read 2839 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.

Keta From Germany, joined Mar 2005, 438 posts, RR: 0
Reply 6, posted (6 years 1 month 4 days 18 hours ago) and read 2772 times:

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

Where there's a will, there's a way

NZ1 From New Zealand, joined May 2004, 2122 posts, RR: 35
Reply 7, posted (6 years 1 month 2 days 19 hours ago) and read 2560 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

David L From United Kingdom, joined May 1999, 8994 posts, RR: 44
Reply 8, posted (6 years 1 month 2 days 9 hours ago) and read 2487 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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