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Date: Sat, 6 May 2000 08:36:49 EDT
Subject: S-Tec 50 Autopilots
To: lancair.list@olsusa.com, DPSKE@teleport.com
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Don wrote:
<Need some input on others experience with the Pitch sensitivity on the S-Tec
50 A/P.  And what was their solution to over sensitivity, if any ???>

1)  Go to   http://www.s-tec.com/  and look at the tech letters.  This will 
address many S-Tec questions.

2) S-Tec has indicated that subjecting the static pressure sensor to 
vibration may cause problems with altitude hold.  I now have mine mounted on 
rubber bushings.

3) The sensor may be bad - there is a test for a certain voltage off one of 
the sensor leads (like the Clinton administration, I don't remember).  Check 
the Tech letters or call S-Tech.  BTW, my sensor was bad which resulted in 
porpoising.

4)  If your S-Tec installation/equipment is old (Circa the early nineties), 
the computer may be too sensitive and the servo rate too fast.  Another 
symptom was a saw-tooth or stepping action to achieve the bank angle for a 
turn.  S-Tec fixed this for me.

5) Trim for level flight at your final settled cruise speed before engaging 
Altitude hold.  If the trim light comes on, disengage Alt Hold and retrim.

6) Make sure there is no "lash" or looseness in the elevator system, 
including the servo-elevator interface. If you use a "cable" interface, are 
the cables taut?

She runs steady as a rock now.


Scott Krueger
N92EX
    
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