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Old 08-05-2018, 07:28 PM
YellowJacket RV9 YellowJacket RV9 is offline
Join Date: Oct 2012
Location: Clearwater, FL / KZPH
Posts: 1,159
Default GRT A/P roll servo water intrusion

Hey guys -

My normally hangared 9A sat outside Friday night when some heavy rain came through. On climbout Saturday morning, I flipped on the autopilot and got some wonky error messages, mainly "roll servo hardware failure", and possible a communication failure as well. Anyways, I flipped the power to the servos off, tested the controls, and continued the flight. Saturday night the plane sat out in the rain again. When I went to take a quick look at the servo this AM on the ramp in Georgia, I found water on the top portion of the servo, and am guessing water got into either the DB9 connector, or even worse, the servo body itself.

When I am back at the hangar later this week I will remove and inspect the servo and see if I can test it on the ground, but I am wondering if this has happened to others, and if so, what have you done to better rain-proof the roll servo. I don't see any obvious leak paths, but obviously water is getting in there. Are GRT servos sealed units? If so maybe it's just water in the connector body that I can dry out at then seal up.


Chris Johnson
RV-9A - Done(ish) 4/5/16! Flying 4/7/16
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