Hi tech experts - travelled some times with an A320 now and I wonder what
motor makes that sound clearly audible after engine shut down in parking
position, best audible from above the wings? It is not the freight doors - they
come later and flaps and slats are already retraced of course. And I have the
feeling it is an electric motor and not something hydraulic.
I recorded the sound in a
video: Engines are shut off at 0:30 and the sound of
the interruptive motor appears 1:16-1:25. Some feedback loops seems to
be active here - may some part of the trimming system still active?
For comparison,
here I assume you can hear the motor of a freight door which
stops at 0:25 and this sound comes after the one above and after the ground crew
approached.
Sometimes this ehh-ehh-ohh-ehhhhhh-ohh sounds lasts for much longer and you
can sometimes hear this sound after taxiing started (but than it is more difficult to hear as
the engines are running).
Just curious - any tips?
Thanks, Erik.
P.S. I know that it is silly to link to a video if we are just talking on sound and maybe
some people may even have problems with the dropbox-link. My apologies for this...