Baw2198 From United States of America, joined Dec 2003, 637 posts, RR: 3 Posted (11 years 9 months 2 weeks 3 hours ago) and read 2270 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
FBU 4EVER! From Norway, joined Jan 2001, 998 posts, RR: 7
Reply 3, posted (11 years 9 months 1 week 5 days 9 hours ago) and read 1587 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.