Aeronca Sedan Airplanes
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The weak point in the 15AC trim system is the small bronze gear in the overhead trim box. It is driven by a much stronger steel gear that eventually erodes the softer metal part. You can't make a replacement unless you have the factory blueprint. Fortunately, Burl's Aircraft makes this part (4-944-11). I am not a sales representative for Burl, but I have owned five different Sedans over my lifetime. Every single one had a worn out gear and I STRONGLY recommend every person with a 15AC buy this part for eventual future need.