Open Panel On The Port Side On The DC-10 — Tech Ops Forum

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Open Panel On The Port Side On The DC-10

Alphafloor From Chile, joined Jun 2004, 1246 posts, RR: 35
Posted (3 years 12 months 20 hours ago) and read 3370 times:

Hi !

What is this open panel on the port side of a DC-10 ? Something related to the pressurization system ?

Thanks !
-Al-

Darfur : Silence = Complicity !

19 replies: All unread, jump to last

FutureUApilot From United States, joined May 2004, 1365 posts, RR: 18
Reply 1, posted (3 years 12 months 19 hours ago) and read 3163 times:

Well I don't know exactly, but I believe the pressurization outflow valve is located in the back of the aircraft on the underbelly. I have no clue what that hole is though...

-Sam

The Pilot is the highest form of life on Earth!

Avioniker From United States, joined Dec 2001, 1097 posts, RR: 10
Reply 2, posted (3 years 12 months 19 hours ago) and read 3157 times:

It's the pressurization outflow valve

One may educate the ignorance from the unknowing but stupid is forever. Boswell; Date unknown.

XFSUgimpLB41X From United States, joined Aug 2000, 3253 posts, RR: 24
Reply 3, posted (3 years 12 months 18 hours ago) and read 3114 times:

Official name is the butterfly valve. As previously stated..it's a pressurization outflow valve.

Chicks dig winglets.

FlyingColours From United Kingdom, joined Dec 2003, 2096 posts, RR: 11
Reply 4, posted (3 years 12 months 18 hours ago) and read 3118 times:

MDD Aircraft have their outflow valves on the starboard side just forward of the wing like that one.

Phil
FlyingColours

Lifes a train racing towards you, now you can either run away or grab a chair & a beer and watch it come - Phil

Alphafloor From Chile, joined Jun 2004, 1246 posts, RR: 35
Reply 5, posted (3 years 12 months 15 hours ago) and read 1943 times:

Thanks for your answers !
...and is this outflow valve automatized or manually controlled on the DC-10 ?

Darfur : Silence = Complicity !

Philhyde From United States, joined Aug 2003, 604 posts, RR: 4
Reply 6, posted (3 years 12 months 14 hours ago) and read 1928 times:

This is a guess, but I would say (and hope) that the cabin pressure is adjusted by a computer, so I'll go with automated.

cheers,
Phil

HoustonSpotters.net Admin - Aviation Nut

EMBQA From United States, joined Oct 2003, 7698 posts, RR: 10
Reply 7, posted (3 years 12 months 14 hours ago) and read 1923 times:

That is actually just a aerodynamic door. The valve is a little deeper inside.

"It's not the size of the dog in the fight, but the size of the fight in the dog"

Dc10hound From United States, joined Dec 2000, 463 posts, RR: 5
Reply 8, posted (3 years 12 months 14 hours ago) and read 1916 times:

...and is this outflow valve automatized or manually controlled on the DC-10 ?

There are three modes of operation for the DC-10 outflow valve:

Auto

Semi-Auto (Standby)

Manual

"Eagles soar. But weasels never get sucked into jet intakes.."

FutureUApilot From United States, joined May 2004, 1365 posts, RR: 18
Reply 9, posted (3 years 12 months 14 hours ago) and read 1902 times:

Ok, sorry, i was wrong... Innocent

-Sam

The Pilot is the highest form of life on Earth!

HAWK21M From India, joined Jan 2001, 26080 posts, RR: 51
Reply 10, posted (3 years 12 months 10 hours ago) and read 1854 times:

Def the Pressurisation Outflow valve Gate assy.
regds
MEL

Think of the brighter side!

Alphafloor From Chile, joined Jun 2004, 1246 posts, RR: 35
Reply 11, posted (3 years 12 months 3 hours ago) and read 1811 times:

Thanks everyone for your answers !
-Al-

Darfur : Silence = Complicity !

Alphafloor From Chile, joined Jun 2004, 1246 posts, RR: 35
Reply 12, posted (3 years 12 months 1 hour ago) and read 1800 times:

My understanding is that this outflow valve is regulating the DeltaP of the cabin pressurization, right ? My third question would be: is this outflow valve open sometimes during cruise ? I have always noticed this outlflow valve open while the a/c is on the ground and then closed before taxi.

-Al-

Darfur : Silence = Complicity !

Bruce From United States, joined May 1999, 4905 posts, RR: 17
Reply 13, posted (3 years 11 months 4 weeks 1 day 20 hours ago) and read 1766 times:

Here is a picture that I uploaded many years ago.... (my 10th upload!) and it shows this valve on a DC9.

View Large View Medium
Click here for bigger photo!

Photo © Bruce Leibowitz

bruce

Bruce Leibowitz - Green Bay, WI (GRB/KGRB) - Canon 20D/100-400L IS lens

B747FE From Switzerland, joined Jun 2004, 131 posts, RR: 1
Reply 14, posted (3 years 11 months 4 weeks 1 day 20 hours ago) and read 1761 times:

The outflow valves are variable area units that control the rate of discharge of compartment air, and therefore Delta P. This valves are always modulating to maintain the cabin in the selected flight profile.

"Flying is more than a sport and more than a job; flying is pure passion and desire, which fill a lifetime"

TimT From United States, joined Jun 2001, 166 posts, RR: 0
Reply 15, posted (3 years 11 months 3 weeks 1 day 12 hours ago) and read 1638 times:

The outflow valve is the larger of the 2 doors in the photo and the smaller one is the thrust recovery valve on the DC-10 picture.

NightFlyer From United States, joined Sep 2001, 81 posts, RR: 2
Reply 16, posted (3 years 11 months 3 weeks 19 hours ago) and read 1586 times:

If you look at the MD10 outflow valve they changed it to the MD11 style. It's just a one piece panel. Just a little useless info for you. Smile

NightFlyer

VC-10 From United Kingdom, joined Oct 1999, 3571 posts, RR: 35
Reply 17, posted (3 years 11 months 3 weeks 16 hours ago) and read 1555 times:

AIRLINERS.NET CREW
FORUM MODERATOR

The Outflow Ram Air Shield, normally closed, is driven open during the TO roll, rotation & lading to deflect the airstream and create a low-pressure area over the Outflow Butterfly Valve.

The Butterfly Vlv controls the outflow of air at low flight altitudes.

The Thrust Recovery Vlv control air outflow at moderate to high flight altitudes.

[Edited 2005-01-21 20:34:04]

Alphafloor From Chile, joined Jun 2004, 1246 posts, RR: 35
Reply 18, posted (3 years 11 months 2 weeks 2 days 1 hour ago) and read 1411 times:

Thanks everybody! Thanks VC-10 for the great diagram !! My old DC10 question has finally an answer... (a question I had since I was a kid !).

-Al-

Darfur : Silence = Complicity !

Jetmech55 From United States, joined Jan 2005, 6 posts, RR: 0
Reply 19, posted (3 years 11 months 2 weeks 13 hours ago) and read 1330 times:

Alpafloor, as a side note the KC-10A doesn't have an outflow valve, it only has the thrust recovery valve. Also, it has 2 airconditioning packs versus the DC-10's 3 packs..