Precision Flight Serial CAT I and Microsoft Flight Simulator 9 (2004) - Manual (Page 11)

Set Up Guide for Serial CAT1 and FS2004 Page 11
C2. Aileron Calibration
4. Now click on Select button under the Aileron Axis. This should say Set Automatic now.
5. Turn your yoke all the way to the Left and hold it. Click on the Set left most limit.
6. Turn your yoke all the way to the Right and hold it. Click on the Set right most limit.