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Thread: Strange "valve-like" sound on 747 before landing
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Old Aug 23, 2011 | 6:37 am
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cornishsimon
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Originally Posted by BingBongBoy
The only thing that I have ever heard, which I believe is something on the 767 and the 747 is when the cabin pressure is equalizing and there is a large expel-ant of cabin air... Shortly before landing...

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