Planespotterx From , joined Dec 1969, posts, RR: Posted (7 years 11 months 3 weeks 2 days 17 hours ago) and read 1109 times:
I have been to EGCC recently, taking pics of DPSP, and i noticed a small "missing" part, possibly a panel from the fuselage, its in between the wing and the cockpit, about less than halfway up.
Someone asked me what i thought it could be, and i havent a clue, anyone shed any light on this.. thanks.
Mr Spaceman From Canada, joined Mar 2001, 2773 posts, RR: 21 Reply 1, posted (7 years 11 months 3 weeks 2 days 17 hours ago) and read 982 times:
Hi Planespotterx.
In the photo below, there is what appears to be a small panel missing from the DC-10's fuselage directly below the letter "L" in the word CONTINENTAL.
Is this the missing panel that you're asking about?
If so, it's been asked about before, and I believe the answer was that it is the aircraft's cabin pressure control valve. It's a butterfly valve/door where cabin air exits from.
Cx flyboy From Hong Kong SAR, PRC, joined Dec 1999, 5581 posts, RR: 61 Reply 3, posted (7 years 11 months 3 weeks 2 days 16 hours ago) and read 940 times:
747Teach From United States, joined Nov 2000, 176 posts, RR: 2 Reply 5, posted (7 years 11 months 3 weeks 2 days 16 hours ago) and read 928 times:
Planespotterx: I believe what you're seeing is the cabin pressure control valve group. It does appear to be "holes" in the side of the fuselage. What you're seeing is actually 3 separate components. The most forward device is the cabin outflow valve ram air shield, which is open during takeoff, rotation, and landing. It's purpose it to shield the butterfly valve from most of the direct blast of the airstream. Directly aft of the shield is the main component, the cabin pressure outflow butterfly valve. This valve controls the outflow of cabin air, and therefore cabin pressure, at low altitudes and low differential pressure. It is driven by two actuators and some linkage, and pivots in the center. And directly aft of the butterfly valve is the cabin pressure thrust recovery valve. Its purpose is to control cabin air outflow at moderate to high altitudes and moderate to high differential pressure. At moderate to high altitudes and differentials, the larger butterfly valve is mostly closed. Also, the thrust recovery valve will derive some thrust from the outflow of the cabin air, hence the name. This information comes from the DC-10 Aircraft Maintenance Manual, Chapter 21-30-00, Description and Operation. Hope this answers your question. Regards,
XFSUgimpLB41X From United States, joined Aug 2000, 3315 posts, RR: 40 Reply 7, posted (7 years 11 months 3 weeks 2 days 6 hours ago) and read 862 times:
Yep.. thats the butterfly valve for the cabin pressurization.
Mr Spaceman From Canada, joined Mar 2001, 2773 posts, RR: 21 Reply 9, posted (7 years 11 months 2 weeks 2 days 15 hours ago) and read 760 times:
Hi Planespotterx. You are very welcome! My pleasure.
One of the best things about this forum is how you can learn about airliners by simply reading what other folks are talking about. Regarding your post and the responses you received, I think 747 Teach really supplied us with great info.
He explained that this "missing panel" you decribed is called the Cabin Pressure Control Valve Group, which is made up of 3 separate components....the cabin outflow Ram Air Shield, thw cabin pressure outflow Butterfly Valve, and the cabin pressure Thrust Recovery Valve. Great info on the part of 747 Teach
Here's my last 2 cents towards your post...a cool pix which shows these 3 components very clearly.
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