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Thread: A320 noise change in descent at 1.8 Delta PSI
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Old 2nd July 2017 | 06:17
  #8 (permalink)  
mcdhu
 
Joined: Mar 2000
Posts: 1,337
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From: Sunrise Senior Living
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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