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Md80 Dc-9 Dash Pot?  
User currently offlineBaw2198 From United States of America, joined Dec 2003, 637 posts, RR: 4
Posted (10 years 4 months 6 days 5 hours ago) and read 1825 times:

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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3 replies: All unread, jump to last
 
User currently offlineGoldenshield From United States of America, joined Jan 2001, 6101 posts, RR: 14
Reply 1, posted (10 years 4 months 6 days 2 hours ago) and read 1642 times:

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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User currently offlineSlamClick From United States of America, joined Nov 2003, 10062 posts, RR: 68
Reply 2, posted (10 years 4 months 5 days 7 hours ago) and read 1185 times:

Search under "outflow valve" or "manhole cover" or, a related item "sugar scoop"



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User currently offlineFBU 4EVER! From Norway, joined Jan 2001, 998 posts, RR: 7
Reply 3, posted (10 years 4 months 4 days 12 hours ago) and read 1142 times:

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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