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The original Brittain PC (back before PC meant "politically correct") was installed as a no-nonsense, basic autopilot. Years later, it's still going. When it does stop working, the fix is usually simple and cheap and Cecilia at Britain is very generous with her support. My PC had begun needing more and more right wing down correction, so I figured there was a leak.....usually due to a leak around the rubber boot. I re-taped the boot, but it didn't correct the problem. Finally, I removed the entire servo (you don't have to have monkey arms, but it helps if you do) and discovered the servo was leaking but from the center, not the boot. I asked Cecilia she advised: "The sealant used is commonly known as “Perm-e-Tex” but its proper name is “aviation form-a-gasket”. You can generally find it at one or more of the national retail auto part stores." Now that is a cheap fix! Try fixing your King, or S-tec autopilot with Permatex.
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