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The S-Tec autopilots use very slow-moving servos, so all settings must be
correct in order for them to control the aircraft properly:
1. Bridle cable tension - the 320 and 360 use a bridle cable to connect the
pitch servo to the elevator tube.  Make sure the tension is 15 +/- 2 lbs.
2. Clutch torque setting - if the clutch torque is set too low, the servos
will slip when loads increase, resulting in deviations.  Reading and setting
the torque requires a special adapter - time to see your local S-Tec dealer
(and the servo has to come out).
3. Servo speed and computer gain - The servos and computer gain settings
must be set at S-Tec for the 320 / 360 (or any particular aircraft).  If the
autopilot was purchased used from another aircraft without going to S-Tec
for conversion to your aircraft, it will not work properly.
With all these conditions met, the S-Tec should work well under all
conditions, but you should not use it to fly through severe turbulence -
that can overload and burn out the servo drive outputs in the computer.
Also, don't hand fly the aircraft with the autopilot engaged, that can also
damage the computer.

David Buckwalter
Avionics Systems
<http://www.avionikits.com>

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