nema
Posts: 479
Joined: Fri Feb 24, 2006 3:18 am

What Is This Flap On The DC10 For?

Sat Jul 28, 2007 8:52 am

Can someone explain what this flap/door is for on the DC10.

You can see it on the following a.net photo just under the windows directly below the letters N & T of International.


http://www.airliners.net/open.file/1238700/M/


I have just seen an interesting video where this flap is open as the aircraft powers up for take off and it then, as the aircraft begins to accelerate, it closes. Is this automatic, was it forgotton or do you suggest it was closed manually by the crew at that time?
There isnt really a dark side to the moon, as a matter of fact its all dark!
 
474218
Posts: 4510
Joined: Mon Oct 10, 2005 12:27 pm

RE: What Is This Flap On The DC10 For?

Sat Jul 28, 2007 8:58 am

It's the forward outflow valve.
 
avioniker
Posts: 1099
Joined: Tue Jan 01, 2002 5:38 am

RE: What Is This Flap On The DC10 For?

Sat Jul 28, 2007 9:55 am

It's automatic.
From the time the aircraft starts its takeoff run, until it passes through 5000 ft, the pressurization controller maintains the aircraft cabin at the field elevation.
That's in case they have to return to the runway.
Keeps ears from popping and limits undue stress on a number of components that are vented to the outside air.
That is, of course, if the engineer is using the automatic mode of the pressurization controller.

 Smile
One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533

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