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STEC 55x porpoise

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Joined
Sep 1, 2016
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Anyone have problems with the altitude hold with an stec55x? Mine will capture the altitude and then it will start climbing 40-60 feet then quickly correct (up and down, up and down). Gets very annoying and I have to disconnect the AP and my passengers hate it. It doesn't do it all the time and I use to attribute it to "mountain waves" but I think that was me trying to explain it away. I have noticed that the trim wheel seems to be a little stiffer so I'm wondering if I need to lube the rigging and servos.
 

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