What was found
REMOVED EXISTING BALANCE WEIGHT ASSEMBLY, PN 65388-34 ON THE LT AILERON AND REPLACED WITH A SERVICEABLE BALANCE WEIGHT ASSEMBLY OF THE SAME PN AND WEIGHT. AT ANNUAL INSPECTION, THE WEIGHT WAS FOUND BROKEN OFF AT THE ATTACHMENT TUBE. THE EXISTING RIVET PATTERN WAS REUSED. SINCE THE WEIGHT AND ATTACHMENT POINTS WERE IDENTICAL BETWEEN THE ASSEMBLIES, THERE WAS NO CHANGE TO THE WEIGHT AND BALANCE. THE PILOT DID NOT NOTICE ANY DIFFERENCE IN THE HANDLING OF THE RESPONSE OF THE AC PRIOR TO THE REPAIR. THE BROKEN OFF WEIGHT WAS FOUND IN THE WING BETWEEN THE OUTER RIB AND THE ADJACENT IB RIB. (K)