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Trutrak DSB-B servo inop

Marcus de Ferranti

I'm New Here
This servo is connected to an Altrak Vertical hold in my RV8. After 15 years of use, it's gradually lost effective altitude hold, originally in colder OAT. It still engages but the light soon flashes as the height wanders off datum. I can't find a manual that describes any potential servo adjustment. Any ideas out there or does it most likely need refurb/replacement?
 
Servo issue

It's possible that the shear screw is broken or that there is wear in the servo itself.

First thing to check is to engage it on the ground and verify whether or not the servo engages and holds the controls properly. If it does engage and hold the controls, is there significant lost motion when applying force at the stick / elevator?

You can PM me results and I will help you through next steps.

thanks!
 
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