roll servo location in Aztec

[Jim Burns]

Wondering if anybody knows the normal location of the roll servo for an
S-Tec autopilot in an Aztec. We're having some roll oscillation problems
and we'd like to examine the electrical connections and the motor brushes if
possible.

Thanks
Jim

[Denny]

Roll servo is likely under your left foot, but can be elsewhere... Had
a newly installed S-Tec 50 in an Aztec that had all kinds of teething
problems with oscillations... Finally solved after months of struggle
when S-Tec physically changed out the components on the amplifier
board... My suggestion is to take it back to the installer or to a
radio shop that is familiar with S-tecs...

Denny

[Jim Burns]

Looking at the Piper parts manual, it looks like they put them either under
the pilots side cabin floor, co-pilots cabin floor, or the right engine
nacelle. I'll turn it on and give a listen. Right now everything is
pointing to the brushes being glazed over, from what I can find in the logs
the roll servo hasn't been touched since it was installed 9 years ago and
S-Tec recommends cleaning up the brushes every 3-4 years to prevent roll
oscillations due to a higher required starting voltage.
Thanks
Jim

[Jeffrey Ross]

Mine was located in the right engine nacelle, I believe in the area
behind the firewall.


Jim Burns wrote:
> Looking at the Piper parts manual, it looks like they put them either under
> the pilots side cabin floor, co-pilots cabin floor, or the right engine
> nacelle. I'll turn it on and give a listen. Right now everything is
> pointing to the brushes being glazed over, from what I can find in the logs
> the roll servo hasn't been touched since it was installed 9 years ago and
> S-Tec recommends cleaning up the brushes every 3-4 years to prevent roll
> oscillations due to a higher required starting voltage.
> Thanks
> Jim
>
>

[Jim Burns]

Which Aztec model? year? and autopilot?
thanks
Jim