Slight ringing at low RPM when taxiing

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Subject:		Slight ringing at low RPM when taxiing
From:		Bill Strahan (bill@gdsx.com)
Date:		Wed Nov 18 - 10:18 AM

I hear the very slightest ringing sound when taxiing.  It does not occur at idle
RPM, and can only be heard for a brief moment as the RPMs come up from idle
to sufficient RPM to start to taxi.

It is very brief, and very quiet, but it's there.  Just the tiniest ringing sound.
And it seems to change in frequency with the engine during the short time
it can be heard.

I don't hear anything of the sort on takeoff or in flight.

Any ideas?


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