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#1
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Ernie,
I thought at first you may be getting noise from an avionics fan, but I don't think that would continue when you shut the master off. I think it would spool down rather quickly. It would probably continue with the avionics master off. My blower comes on with the aircraft master switch. If you have access to a stethoscope you might try holding it to the face of each of your gyros to see if that helps you define the source.
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Jim Stack Richmond, VA 
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#2
07-21-11, 06:31 PM
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A poor (or lazy) mans stethescope
To isolate the source of a sound you can even use any old rubber hose.
One end near your ear, and you will be hearing whatever is near the other end of the hose. Crude but effective. D
__________________
David Wartofsky Potomac Airfield 10300 Glen Way Fort Washington, MD 20744
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#3
07-21-11, 10:35 PM
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Thanks for all responses. Did two test flights with a stethoscope. Can't pinpoint where it's coming from. But it sure looks as if speed or attitude affects the noise, which disappears when you climb from cruise altitude. Tomorrow my A&P and avionics guy will take it for a spin.
Ernie
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