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Old Aug 23, 2011 | 6:28 am
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kexbox
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Strange "valve-like" sound on 747 before landing
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
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