Flyf15 From , joined Dec 1969, posts, RR:
Reply 1, posted (13 years 4 months 1 week 6 days 19 hours ago) and read 1546 times:
Although I don't know the answer to the questions, I once saw a a pic of a United DC-10 from the 1970s which had a brownish gold stain on the side comming from these vents...presumably from the cigarette smoke onboard.
Chdmcmanus From United States of America, joined Mar 2001, 374 posts, RR: 2
Reply 6, posted (13 years 4 months 1 week 6 days 17 hours ago) and read 1513 times:
The thrust recovery outflow valve is essentially the valve that controls cabin altitude throughout the isobaric selection range. It can be controlled electrically through 2 electric motors receiving input from the automatic and semi-automatic cabin pressure controller/computer. On the -10's with Flight Engineers, the clutches could be disengaged via a handle at the FE station, and the valve was then controlled through a manual wheel. I'm not sure about the later models. As far as the name is concerned, I guess it comes from the recovery of bleed air (thrust loss) to pressurization. It probably falls into the same category as why Lockheed re-named the short circuit as a "differential electrical fault"?? I'm not sure why they would put it there either. During Flight Engineer school, we covered some general DC-10 systems, and I work around them, but I have never flown one. Sorry I couldn't be more help on this one.
Dc10hound From United States of America, joined Dec 2000, 463 posts, RR: 5
Reply 7, posted (13 years 4 months 1 week 6 days 16 hours ago) and read 1492 times:
The Cabin (Over) Pressure Relief Valves (Three each, why there are are three, I don't really know) are located on the opposite side of the fuselage, almost directly across from the cabin outflow and thrust recovery valves. They live just aft of the Forward Cargo Door. Sorry, I don't have a photo of these.
Check out a MD-11 sometime. You'll see only one cabin pressure valve in the same location as three on a 10.
"Eagles soar. But weasels never get sucked into jet intakes.."
VC-10 From United Kingdom, joined Oct 1999, 3701 posts, RR: 34
Reply 10, posted (13 years 4 months 1 week 6 days 14 hours ago) and read 1476 times:
Going from front to rear:-
1) The Outflow Valve Ram Air Shield.
Normally this is closed but is driven open during TO roll, rotation & ldg to deflect the airstream & create a low pressure area over the outflow butterfly valve.
2) The Outflow Butterfly valve.
Controls the outflow of cabin exhaust air to maintain cabin pressure during low flight altitudes & low diff pressures.
3) Thrust Recovery Valve.
This valve controls pressurisation during moderate to hight flight Alts. It is so called due to the fact they can recover some thrust as the air spills out.
As the throttles are opened for TO the butterfly valve will modulate towards closed.
I know of one incident when someone, who should have known better, was watching from his office a '10 line up at LGW, saw a hole in the side of the a/c and got it to return to the gate. Only to find out that what he had been looking at was the open butterfly valve.
Finally, you can declutch the outflow valve sys on all '10's
DC-9CAPT From , joined Dec 1969, posts, RR:
Reply 12, posted (13 years 4 months 1 week 6 days 10 hours ago) and read 1469 times:
Since this is such a good digital photo and I know nothing about the DC-10,
could someone explain what those two, equally sized access panel doors are? These doors are right below the forward entrance and left and below the flag.
I assume they are for servicing the nose gear or avionics.