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Rick,

1) If one aileron is slightly underbalanced, this means that the other is happy at neutral and remains in the airflow.  The underbalanced on is then subject to uneven airflow to take up the lash in the system.  Clamp one aileron in place and see how far the other can move before the slight lash in the system reaches the limits (some lash is normal).

2) Airflow cannot smoothly follow sudden dips, so it breaks and results in early separation which may make a control surface less effective.  The "dip" may be contributing to the problem.  Remember that the rudder is constructed so that it is slightly wider than the trailing edge of the vertical stab.  Airflow meeting a slight rise can easily follow the rise.

3) Check the "wiggle" in the hinge.  Vibration can cause wear at a very high rate and such wear can result in increasing sloppiness in that control surface movement.

4) Consider rigging both ailerons to fly slightly high (just slightly) which puts a slight air load on both of them. 5) Consider using stainless steel welding rod and teflon tubing as a replacement for the steel hinge pins.  No lubrication is needed and wear seems to be greatly reduced.

Scott Krueger
N92EX

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