Hi Allen,
Have you checked the 22,000uF filter cap and connections?
Or perhaps its a filter cap in the Flightcom itself.
regards,
Terry Seaver
A135/N135TD
Alan D Stewart wrote:
> Hi Guys,
>
> After four years of satisfactory service in my Europa, the Flightcom 403
> intercom installation has begun to
> exhibit a highly irritating background hum with headsets attached and
> engine running.
>
> The hum frequency follows the engine RPM closely. Pulling every circuit
> breaker in the panel, bar the intercom
> itself does not alleviate the problem.
>
> Turning down the individual headset earpiece volume controls helps, but
> does not cure the problem.
>
> Both headsets suffer equally, irrespective of which whether pilot or
> passenger circuit is connected. Disconnecting
> either has no effect. In all other respects the installation behaves as
> it should. (transceiver etc)
>
> Having pulled the panel several times and checked for obviously loose
> wiring, I'm becoming a tad frustrated.
>
> This is clearly leakage and is related to engine turn rate.
>
> Any panel wizards out there got it figured ? Please help. I'm getting
> p...ed off !!
>
> Alan
>
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