PPRuNe Forums - Whats that "depressurization" noise in A319/20/21

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Too Low Terrain

9th Dec 2006 06:33

Whats that "depressurization" noise in A319/20/21

Hi Folks
Anybody out there who can explain the exact source of that
"depressurization noise" which comes on during descent somewhere
below FL80 or so ?

It sounds like coming from somewhere behind the circuitbreaker panel
and its only in (the last part of) descent, however I cannot really
locate it nor explain the reason for it.

It sounds like....well.......a continuous.......err......"psshhhhhhhhhhhhhhh....." :E

Any explanation welcome !

Aztec Kid

9th Dec 2006 07:43

Most likely, what you are hearing are the keel beam drains. I believe they open at 2.0 PSID.
The Kid

E cam

9th Dec 2006 18:31

I think the noise comes from the floor grill, just in front of the flight deck door. It is more obvious in the 321 than the 320. More keel beam drains?

walkertonio

9th Dec 2006 19:58

Maybe it is your bottle of water which doesn't support the change in differential pressure ? ;) :)

SFCC	10th Dec 2006 00:52

Aztec Kid is right........just take a look at the delta P indication next time it starts. It will be 1.9 or 2.0 psi guaranteed.

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