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1) Centre Prop bearing is worn - causing an annoying whirring noise in the cabin
Mine seems to be doing this. How did you diagnose?
I can't tell where the noise is coming from as when I turn my head.
It sounds like some metal being gently turned on a lathe or almost like a hosepipe running but not as loud.
I will try jacking up and spinning the wheels today and hope it is not a prop bearing.