rj85fan
Topic Author
Posts: 5
Joined: Sun Dec 07, 2003 1:53 am

round hole opening on left side of the DC-10

Mon Feb 20, 2017 11:05 pm

I am wondering what the round looking valve on the left side of the DC-10 is for? I thought it might be the APU exhaust, but it looks like the APU is toward the rear of the aircraft. When I have seen pictures of the aircraft taxing, the round looking vent hole is open; closed during flight. Is it relate to pressurization?

rj85fan
 
LH707330
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Joined: Fri Jun 15, 2012 11:27 pm

Re: round hole opening on left side of the DC-10

Mon Feb 20, 2017 11:37 pm

A picture would be good to see what you're talking about. Is it a round one about 6 inches/15 cm in diameter near the aft doors? If so, then that's probably a cabin outflow valve.
 
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CALTECH
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Joined: Thu May 17, 2007 4:21 am

Re: round hole opening on left side of the DC-10

Tue Feb 21, 2017 2:11 am

rj85fan wrote:
I am wondering what the round looking valve on the left side of the DC-10 is for? I thought it might be the APU exhaust, but it looks like the APU is toward the rear of the aircraft. When I have seen pictures of the aircraft taxing, the round looking vent hole is open; closed during flight. Is it relate to pressurization?

rj85fan


Are you asking about the hole on the fuselage forward of the wing with the 'brown' stain streaming aft of it, in these photos ? That is the DC-10 Outflow Valve, controls pressurization. It is not near the aft doors.

Image

Image

Image
UNITED Would Be Nice
 
rj85fan
Topic Author
Posts: 5
Joined: Sun Dec 07, 2003 1:53 am

Re: round hole opening on left side of the DC-10

Tue Feb 21, 2017 3:53 am

Thanks so much; mystery solved
 
BravoOne
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Re: round hole opening on left side of the DC-10

Tue Feb 21, 2017 11:07 am

If you look closely you will sea a brownish streak that is staining the fuselage. That's from nicotine, so one would think that these pictures were probably taken prior to the no smoking era?
 
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CALTECH
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Joined: Thu May 17, 2007 4:21 am

Re: round hole opening on left side of the DC-10

Tue Feb 21, 2017 3:01 pm

BravoOne wrote:
If you look closely you will sea a brownish streak that is staining the fuselage. That's from nicotine, so one would think that these pictures were probably taken prior to the no smoking era?


Yes, back in the smoking era. So easy finding seals that leaked. Or even rivets.
UNITED Would Be Nice
 
113312
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Joined: Sat Apr 16, 2005 9:09 am

Re: round hole opening on left side of the DC-10

Tue Feb 21, 2017 3:47 pm

There are actually three parts to the pressurization outflow on the DC-10. A deflector, the large butterfly valve, and a second thrust recovery jet valve. You might notice that on the MD-11, this has been reduced to a single outflow valve. This change was also incorporated in the MD-10 conversion for FedEx.
 
benbeny
Posts: 115
Joined: Thu Nov 03, 2016 1:44 pm

Re: round hole opening on left side of the DC-10

Wed Feb 22, 2017 3:50 am

113312 wrote:
There are actually three parts to the pressurization outflow on the DC-10. A deflector, the large butterfly valve, and a second thrust recovery jet valve. You might notice that on the MD-11, this has been reduced to a single outflow valve. This change was also incorporated in the MD-10 conversion for FedEx.

What is thrust recovery valve?
 
113312
Posts: 628
Joined: Sat Apr 16, 2005 9:09 am

Re: round hole opening on left side of the DC-10

Thu Mar 16, 2017 4:29 pm

It is an outflow port designed like an exhaust nozzle to produce a small amount of force offsetting the power loss of bleeding air from the compressor for pressurization.

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