Servo sudden loss of torque.

[RandomSquawk]

Sudden loss of torque on a servo that has seen light use over 300 airframe hours. I was straight and level in smooth air. Then the "heavy" wing began to droop, and the HDX showed "roll slip". I could feel on the stick there was no servo torque at all. If I disengage and re-engage there's a brief moment of responsiveness. Then nothing again.

Servo still makes noise on the ground, so it must still have power. Shear screw is still good. Servo turns smoothly by hand. The other (pitch) servo seems fine.

Before I dig any further, what diagnostic steps should I take next?

 

[RV8JD]

There are some troubleshooting items on page 10 of the new "Autopilot In-Flight Tuning Guide - For SkyView Software Version 16.4 and AFS Software Version Vx16.10".

https://dynonavionics.com/includes/guides/SkyView_Autopilot_In-Flight_Tuning_Guide-Rev_D.pdf

Each item listed also includes: "Contact Dynon Technical Support", which you may have to do anyway.

 

[RandomSquawk]

"Contact Dynon Technical Support", Yup, I figured that's where I'd end up. This isn't a new-install kind of issue. All the calibration, testing, and tuning was done a couple years ago.