baw2198
Posts: 587
Joined: Wed Dec 24, 2003 11:20 am

Md80 Dc-9 Dash Pot?

Mon Jul 26, 2004 11:21 am

On the pilot side of the plane about 3 ft. forward of the left engine, there is a circular opening that closes and opens. What system is that and what specifically is that thing trying cool (if cooling at all)? Does it open during flight?
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Goldenshield
Posts: 5008
Joined: Sun Jan 14, 2001 3:45 pm

RE: Md80 Dc-9 Dash Pot?

Mon Jul 26, 2004 2:32 pm

What you are referring to, is the pessure control valve (for lack of a better term.) There are numerous threads in this forum section about it.  Smile
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SlamClick
Posts: 9576
Joined: Sun Nov 23, 2003 7:09 am

RE: Md80 Dc-9 Dash Pot?

Tue Jul 27, 2004 9:46 am

Search under "outflow valve" or "manhole cover" or, a related item "sugar scoop"
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FBU 4EVER!
Posts: 980
Joined: Sat Jan 27, 2001 6:53 am

RE: Md80 Dc-9 Dash Pot?

Wed Jul 28, 2004 4:30 am

In SAS we call it the "butterfly" valve.
It starts to close at take-off when the throttles are advanced.If the take-off is abandoned or the A/C is not airborne within 60 seconds of T/O thrust having been applied,the valve will open and dump the cabin pressure.
If the cabin pressure controller has been set according to procedures,the valve will be open just before touchdown.If not it will dump residual cabin pressure at toudchdown.
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