Md80 Dc-9 Dash Pot? — Tech Ops Forum

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Md80 Dc-9 Dash Pot?

Baw2198 From United States of America, joined Dec 2003, 637 posts, RR: 4
Posted (8 years 10 months 4 days 20 hours ago) and read 1507 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?

"And remember, Keep your stick on the ice"--->Red Green

3 replies: All unread, jump to last

Goldenshield From United States of America, joined Jan 2001, 5446 posts, RR: 12
Reply 1, posted (8 years 10 months 4 days 17 hours ago) and read 1324 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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SlamClick From United States of America, joined Nov 2003, 10062 posts, RR: 71
Reply 2, posted (8 years 10 months 3 days 22 hours ago) and read 867 times:

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

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FBU 4EVER! From Norway, joined Jan 2001, 998 posts, RR: 7
Reply 3, posted (8 years 10 months 3 days 3 hours ago) and read 824 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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