What Is The Vent On The Side Of This DC-10? — Tech Ops Forum

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What Is The Vent On The Side Of This DC-10?

Gulfstream650 From United Kingdom, joined Mar 2008, 489 posts, RR: 0
Posted (2 years 11 months 3 weeks 4 days 6 hours ago) and read 3828 times:

There is a vent of some sort on this aircraft to the left of the number 1 engine in this photo. What is it?

Many thanks!

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Photo © Juan Carlos Guerra - FlyAPM

I don't proclaim to be the best pilot in the world but I'm safe

12 replies: All unread, jump to last

BladeLWS From United States of America, joined Dec 2005, 386 posts, RR: 0
Reply 1, posted (2 years 11 months 3 weeks 4 days 6 hours ago) and read 3822 times:

I'm gonna say its an outflow valve for the cabin pressure.

c5load From United States of America, joined Sep 2008, 917 posts, RR: 0
Reply 2, posted (2 years 11 months 3 weeks 4 days 6 hours ago) and read 3808 times:

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Quoting BladeLWS (Reply 1):
I'm gonna say its an outflow valve for the cabin pressure.

What about an air conditioning intake vent?

"But this airplane has 4 engines, it's an entirely different kind of flying! Altogether"

BladeLWS From United States of America, joined Dec 2005, 386 posts, RR: 0
Reply 3, posted (2 years 11 months 3 weeks 4 days 5 hours ago) and read 3795 times:

Quoting c5load (Reply 2):
What about an air conditioning intake vent?

Those should be on the nose infront of the nose wheel, packs intake and avionics cooling, an intake wouldn't have a valve like that.

[Edited 2010-06-01 19:58:43]

Fly2HMO From , joined Dec 1969, posts, RR:
Reply 4, posted (2 years 11 months 3 weeks 4 days 5 hours ago) and read 3781 times:

Quoting BladeLWS (Reply 1):
I'm gonna say its an outflow valve for the cabin pressure.

Me thinks so too.

Quoting c5load (Reply 2):
What about an air conditioning intake vent?

Nope. Intakes are purposely made to be able to, well, intake as much air as efficiently as possible. A random flat hole on the side of the fuselage will not have air flowing into it, and therefore would not work as an intake. Intakes usually look like a teardrop with a flat bottom or like a wedge of sorts, like on the nose of this plane.

A more obvious pic:

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Photo © Alevik

[Edited 2010-06-01 20:12:12]

tdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 5, posted (2 years 11 months 3 weeks 4 days 3 hours ago) and read 3706 times:

Quoting Gulfstream650 (Thread starter):
There is a vent of some sort on this aircraft to the left of the number 1 engine in this photo. What is it?

Definitely an outflow valve...the visible flapper is a dead giveaway.

Quoting c5load (Reply 2):
What about an air conditioning intake vent?

Those are farther forward...you can see two NACA scoop inlets just below and aft of the "V" in "PETETE V" on the nose.

Tom.

CosmicCruiser From United States of America, joined Feb 2005, 2212 posts, RR: 16
Reply 6, posted (2 years 11 months 3 weeks 3 days 17 hours ago) and read 3546 times:

tdscanuck is right. Yes, it's the outflow valve. Same on the MD-11 as well. You can see the pack inlet doors on the lower nose with the third not visible on the other side.

KELPkid From United States of America, joined Nov 2005, 5932 posts, RR: 4
Reply 7, posted (2 years 11 months 3 weeks 3 days 8 hours ago) and read 3324 times:

Quoting tdscanuck (Reply 5):
Definitely an outflow valve...the visible flapper is a dead giveaway.

Quoting CosmicCruiser (Reply 6):
tdscanuck is right. Yes, it's the outflow valve. Same on the MD-11 as well. You can see the pack inlet doors on the lower nose with the third not visible on the other side.

Is it just me, or am I mistaken in the (now disproved) belief that the cabin outflow valve is usually located at the rear of the pressure dome in the fuselage?

Celebrating the birth of KELPkidJR on August 5, 2009 :-)

Fly2HMO From , joined Dec 1969, posts, RR:
Reply 8, posted (2 years 11 months 3 weeks 3 days 8 hours ago) and read 3321 times:

Quoting KELPkid (Reply 7):
is usually located at the rear of the pressure dome in the fuselage?

That's how it is usually. However, I don't know of any reason why it HAS to be back there. Maybe somebody can enlighten us.

ZANL188 From United States of America, joined Oct 2006, 3247 posts, RR: 0
Reply 9, posted (2 years 11 months 3 weeks 3 days 7 hours ago) and read 3304 times:

Just FYI, this question probably should be in an a.net FAQ. Comes up from time to time.

What's This Little Door On The DC-10? (by Starlionblue May 2 2005 in Tech Ops)

Open Panel On The Port Side On The DC-10 (by Alphafloor Jan 12 2005 in Tech Ops)

[Edited 2010-06-02 18:00:35]

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boeing767mech From United States of America, joined Dec 2000, 992 posts, RR: 3
Reply 10, posted (2 years 11 months 3 weeks 3 days 7 hours ago) and read 3281 times:

Quoting KELPkid (Reply 7):
Is it just me, or am I mistaken in the (now disproved) belief that the cabin outflow valve is usually located at the rear of the pressure dome in the fuselage?

Quoting Fly2HMO (Reply 8):
That's how it is usually. However, I don't know of any reason why it HAS to be back there. Maybe somebody can enlighten us.

The A330 and A340 has the outflow valves in the belly behind the wing to body fairings.

The 777 has two outflow valves one near the aft pressure bulkhead, and the other in the belly just behind nose landing gear.

The JS3101 and 3201 have the outflow valve on the fwd pressure bulkhead near the co-pilots feet.

I was told by an instructor in a gen fam class on the 767 that they put the outflow valve near the pressure bulkhead to help aid the flow of air in the cabin. Since most of the air comes from overhead ducts and the outflow valves are located below the cabin floor area. But then that was what he explained. All I know is if it is broken I fix it, where ever it is located.

David

Never under-estimate the predictably of stupidty

tdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 11, posted (2 years 11 months 3 weeks 3 days 4 hours ago) and read 3210 times:

Quoting KELPkid (Reply 7):
Is it just me, or am I mistaken in the (now disproved) belief that the cabin outflow valve is usually located at the rear of the pressure dome in the fuselage?

Many aircraft have two, in which case you usually have one forward and one aft.

Tom.