PPRuNe Forums - View Single Post - A320 noise change in descent at 1.8 Delta PSI
Old 2nd Jul 2017, 06:17
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mcdhu
 
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Isn't it to do with the "keel valves" as discussed below:
http://www.pprune.org/tech-log/43546...ht=keel+valves

mcdhu
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