Markings over doors of most Boeings...on the outside

[pilotezulu]

Does anybody know what those strip/markings are on top of each door of most Boeings? I've seen them on a few Airbus a/c as well?

Was just sitting at Joberg Intl staring at a B777 when I noticed those for the first time.

... see if anyone can explain this one? ;)

[matkat]

They are security strips to ensure no one has entered the aircraft whilst un attended

[SMOC]

It's a rain gutter, and they're aligned with the local airflow in the cruise to reduce drag.

[pilotezulu]

hmm... yeah thought about them having to do with the local airflow... but they are all at different angles. The ones over the rear doors, closest to the elevator and angled downward, almost making it look like the airflow is directed downward.

so... security strips/airflow/raingutters?

[EGBKFLYER]

http://www.airliners.net/open.file?id=975383&WxsIERv=Nveohf%20N320-111&Wm=1&WdsYXMg=Oevgvfu%20Nvejnlf&QtODMg=Znapurfgre%20-%20Vagreangvbany%20%28Evatjnl%29%20%28ZNA%20%2F%20RTPP%29&ERDLTkt=HX%20-%20Ratynaq&ktODMp=Qrprzore%207%2C%202005&BP=1&WNEb25u=Wbua%20Sneevatgba%20-%20SyvtugYvarVzntrf&xsIERvdWdsY=T-OHFO&MgTUQtODMgKE=PSZ%20cbjrerq%20N320.&YXMgTUQtODMgKERD=249&NEb25uZWxs=2005-12-14%2000%3A33%3A59&ODJ9dvCE=&O89Dcjdg=006&static=yes&width=1024&height=695&sok=JURER%20%20%28nvepensg_trarevp%20%3D%20%27Nveohf%20N320% 27%29%20NAQ%20%28nveyvar%20YVXR%20%27Oevgvfu%20Nvejnlf%25%27 %20BE%20nveyvar%20YVXR%20%27Oevgvfu%20Nfvn%20Nvejnlf%25%27%2 0BE%20nveyvar%20YVXR%20%27Nve%20Senapr%20%2F%20Oevgvfu%20Nve jnlf%25%27%20BE%20nveyvar%20YVXR%20%27Hagvgyrq%20%28Oevgvfu% 20Nvejnlf%25%27%20BE%20nveyvar%20YVXR%20%27Abegurnfg%20Nveyv arf%20%28Oevgvfu%20Nvejnlf%29%25%27%29%20%20beqre%20ol%20cub gb_vq%20QRFP&photo_nr=36&prev_id=977165&next_id=975329
If it's the strip above the door on this pic, it's the gutter mentioned above...

[rugmuncher]

They are security strips !!
They are put on as the doors are closed immediately prior to departure, so as to indicate whether or not the door has been opened during flight,,
it then saves the receivers having to count passengers as they know nobody has left or entered the plane,

Hope this helps :ok: :p

[BOAC]

Gutters as above, and almost making it look like the airflow is directed downward. - which it probably is. I suspect Boeing did some 'tuft' trials before getting Kwik-Fit to put them on:)

[SMOC]

Down at the last door is correct as it's now aligned with the airflow going under the stabiliser.

http://www.airliners.net/open.file/949042/L/

[matkat]

Need to clarify the question however it is either/or

[None]

A long time ago this subject came up on Pprune. One clever reply was that these fins are called....
...Subsonic Hydrodynamic Flow Dividers
I cannot locate the thread, but it was a classic.

[pilotezulu]

hmm... thanks chaps ... works for me. just wondered what they were.

"Subsonic Hydrodynamic Flow Dividers"... thanks None... now I can sound all cool. :8

cheers.

[Strepsils]

They are rain gutters, not security strips. How does a strip above the door in any way indicate if someone has entered the aircraft or not?

Security strips are sticky labels a few inches long, usually brightly coloured with tamper proof print and they are stuck on the door and the fuselage when closing up and leaving the aircraft unattended. They look nothing like the rain gutters!

[shuttlebus]

Ah None,

You got there before me :cool:

Although I believe it was diverters, not dividers :ok:

Regards,

Shuttlebus

[IFixPlanes]

The Airbus SRM calls them "Rain Deflector"

[pilotezulu]

.... or "Subsonic Hydrodynamic Flow Diverting Rain Deflectors"? :8

[shuttlebus]

This is getting silly :)

Lets leave it at

"subsonic hydrodynamic flow diverters".

When I was at uni, hydrodynamics dealt with all manner of "wet" fluid flows (I put in wet, as the aerodynamicists will argue that air is a fluid), so that covers the rain bit as well.

The flow is definitely sub-sonic and the strips divert flow....

So there you go.

(Shuttlebus now heads off over the horizon, blindly trying to find the life it was rumoured he once had.....:rolleyes: :rolleyes: :rolleyes: )

Regards,

Shuttlebus

[breagh01]

They are gutters. Hey helps when its raining and there is no airbridge on. stops punters getting a wet heid :8