Dynon Servo shear screw replacement
I had broken shear screw on the pitch and roll servos in my -7 this past summer. At first, I noticed that the AP would not hold altitude, occassionally at first, then more frequently. After I replaced that shear screw, I discovered the shear screw in the roll servo was also broken when I was trouble shooting a frequent AP disconnect. No AP flight anomolies associated with the broken roll servo shear screw that I could detect; the frequent AP disconnect was apparently due to some conbination of a faulty roll servo circuit board and/or intermittant ground.
Dynon indicates that their new shear screws are more robust that the early ones.
RV-7, 300 hrs