Electric Trim- KAP150

[Matt M]

So lately my electric trim on my KAP-150 has been giving me some issues. I previously had some issues which I thought were trim switch related. I resolved those over a year ago by  cleaning the micro switches and reassembling the module. A year later more issues. Now if I engage the trim when you depress the far left button you hear the clutch engaging. If you then try the up or down you can see the trim wheel move slightly forward or aft, but it doesn’t go far and hesitates. If I engage the autopilot while on the ground and set altitude hold and use the up down button on the flight computer it moves the elevator as expected then eventually the trim wheel turns freely to trim off the pressure as expected. I thought maybe trim servo, but it seems like it is operating fine when driven by the autopilot. The autopilot works fine in flight and passes all tests. Is the electric clutch triggered by the far left trim switch unique to the manual trim? If so that would explain why the autopilot works fine. Any ideas?

[PT20J]

The servo works the same way whether commanded by the autopilot or manually. Since it works with the autopilot, it sounds like an intermittent trim switch. Cleaning switches is usually a temporary solution because once the switch wears out, the contacts will oxidize again after cleaning. You probably need to replace the microswitches.