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Thread: A320 noise change in descent at 1.8 Delta PSI
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Old 1st July 2017 | 19:55
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Check Airman
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Joined: Mar 2006
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From: USA
The sound is evedint in climb and descent at a delta of 1.8-1.9 PSI, usually around 3500-4000ft.

I always thought it was caused by the seals at the windows closed up properly. The change in noise is quite noticeable below that altitude.
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