What was found
ON DESCENT, EXPERIENCED DIFFICULTY IN TURNING ACFT LATERALLY TO RIGHT. PILOTS WERE ABLE TO CONTROL ACFT AND MAKE A NORMAL LANDING. INITIAL INVESTIGATION BY PILOTS REVEALED A LOUD CLUNK WHEN LEFT AILERON WAS MOVED PHYSICALLY. T/R WAS ABLE TO VERIFY THAT AILERON'S MASS BALANCE WEIGHT HAD BECOME UNATTACHED {LOSS OF ATTACHING HARDWARE}. MECHANICS DISPATCHED TO MAKE REPAIRS AS WELL AS OPERATOR'S MECHANIC TO OVERSEE REPAIRS. ACFT'S FLIGHT CONTROLS WERE FURTHER INSPECTED, & NO ABNOMALIES DISCOVERED. ACFT WAS LATER FLOWN TO MANUFACTURER'S MAINTENANCE FACILITY FOR FURTHER INVESTIGATION. MANUFACTURER ISSUED A MAINTENANCE & OPERATIONS LETTER GV-MOL-03-0034 DESCRIBES OCCURRENCE, NO OTHER ACFT HAVE BEEN AFFECTED.