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This afternoon was my first flight since completing this years annual. As I advanced the throttles to takeoff power, there was a noise in my headset that has never occurred before. At first, I thought the batteries went out in my Bose noise canceling headset but once the throttles were pulled back to 25” it stopped. I did a ground check before shutdown and the same thing occurred.
During the annual, my A&P replaced the rear starter and had both rear mags overhauled this year. Also, we replaced the alt out warning circuit board and the front alternator noise filter.
I haven’t talked to him on this but came here first for ideas since thats the first thing he ask when we have seemingly Skymaster related issues.
Has anyone had a similar problem or any idea where to start diagnosing the problem?
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