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Old 11-12-2013, 06:59 AM
Toobuilder's Avatar
Toobuilder Toobuilder is offline
Join Date: Jul 2009
Location: Mojave
Posts: 4,776
Default S-Tec Servo Issue

I know it's not the most popular autopilot for homebuilts due to the breathtaking price that a TSO'd part commands, but for some reason the builder of my Rocket shelled out the cash and installed a System 30. Now that I got that pesky "over center and lockup issue" fixed, I tried turning it on for the first time for a functional test. The pitch servo grabs hold and is extremely strong compared to the Tru Trak I'm used to. The roll servo on the other hand follows the turn knob, but is not connected to the output arm apparently. In other words, the motor runs, but no movement of the arm/stick. Does anyone know if the S-Tec servos use a shear pin as the TT units do?

And yes, in case you were wondering, as soon as I can verify the system is functional it's going up for sale to a certified driver so I can buy a proper experimental autopilot.
WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.

Michael Robinson
Harmon Rocket II -SDS EFI
1940 Taylorcraft BL-65
1984 L39C
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