What was found
DURING AN ANNUAL INSPECTION, OUTBOARD AILERON BEARING BRACKET APPEARED TO HAVE WORKING RIVETS. REMOVAL OF THE BRACKET REVEALED CRACKS IN THE RIB IN TWO OF THE RIVET HOLES. IT WAS FURTHER NOTED THAT THE BEARING WAS A SOLID ROLLER AND NOT A SPHERICAL BEARING LIKE THE INBOARD AND CENTER BEARINGS CAUSING A ROTATION OF THE RIB SINCE THE PIVOT AXIS OF THE AILERON IS NOT PERPENDICULAR TO THE RIB WHICH IS CAUSING CRACKS IN THE RIB. INSTALLING A SPHERICAL BEARING NR 452-745 LIKE USED IN THE OTHER BEARING HINGE BRACKETS REMOVES THE TWISTING MOTION BY ALMOST 100 PERCENT.