PPRuNe Forums - View Single Post - A320 Cockpit air noise change on climb and descent
Old 2nd Dec 2010, 10:42
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mcdhu
 
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This has been discussed previously so a search should find it.

I seem to remember that, as Meiklour suggests above, it is to do with the keel drainage valves closing - not mentioned in the FCOM.

Cheers
mcdhu
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