Re: IVP flapping/banging noise
I found a noise like you described came from the flapper door in
the back, on the aft bulkhead, behind the fan, for incoming air off
the naca scoop (located on the tail). As the power is pulled
back, the turbo air pressure lessens, but your airspeed on downwind is
still high, and the naca scoop pressure feeding cabin air opens and
flaps that little door...bang, bang, bang. You can not tell
where it's coming from except it's behind you somewhere. It's a
bit nerve racking, but nothing seemed broke, and it remained an
auditory mystery for sometime. It's only heard at certain times,
when power is pulled, and the cabin air flow is shifting from the
pressurized airbox input to the rear naca scoop incoming air.
Hope this helps.
Jeff L
LIVP
I have a
problem that developed at about 60 hours.
It's a
flapping banging noise that sounds about like a main gear door when it
snaps closed. It happens with the gear down or up. I
don't hear it on take off or climbout but I do hear it, e.g. on
downwind. Originally it had a metallic ring to it but
now it's more muffled. I can't tell for sure what part of
the plane it's coming from. I've scoured the engine
compartment but don't find anything. If it is gear doors,
I don't know what would have changed.
Any
ideas?
Colyn
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