Squawk Box

January 2010 Issue

Wear And Tear

The following information is derived from the FAA’s Service Difficulty Reports and Aviation Maintenance Alerts.

The right aileron was binding during aerobatic maneuvers. Investigation revealed the clearance between the aileron and the aileron bay rib was approximately 1/16 inch. Per American Champion, it should be ¼ inch. The inboard aileron bay rib appeared to have bowed due to fabric shrinkage, causing the interference. The aileron rib fabric was opened and the rib was relocated outboard 3/16 inch. Per the manufacturer, aileron balancing was not required. The aileron was reinstalled, with the clearance and operation satisfactory.

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