Ed Cesnalis Posted October 11, 2016 Report Share Posted October 11, 2016 What is this noise? How can I troubleshoot? It sounds and acts a lot like a cooling fan. I have a muffin fan that is very loud and the noise is similar. Symptoms: Noise begins during flight and is not heard until throttled back for landing. Sounds like loud cooling fan. Master Avionics Switch (This switch turns on 3 of my 4 radios) turns the noise off but it won't turn it back on. All 3 radios on this switch can be turned off and the noise remains All circuit breakers can be popped and all components turned off/dark and the noise remains. With headsets on it sounds like radio noise but take them off and its a loud whine loud over the engine at idle or taxi. I stopped flying because there are not landing opportunities where I fly and I haven't a clue what I'm dealing with. ???????????????????? Link to comment Share on other sites More sharing options...
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