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....."
Any explanation welcome !