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Thread: Strange "valve-like" sound on 747 before landing
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Old Aug 23, 2011 | 6:34 am
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BingBongBoy
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Originally Posted by kexbox
Hi,

any teccies among us who can explain a "valve-like" TSHHHHHHHhhhh sound on the 747 around seats 4A/5A before landing? This came up several times before landing and I could not imagine what that was.

Kexbox
Its the baked beans... You should not have had them on your breakfast...

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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