What was found
DURING TAKE OFF THE NR 4 MAIN WHEEL ASSEMBLY SEPARATED FROM THE MAIN LANDING GEAR. PILOTS REPORTED NO ABNORMAL INDICATIONS IN THE COCKPIT. THE FLIGHT CREW WAS NOTIFIED OF THE SITUATION. THE AIRCRAFT LANDED SAFELY. INVESTIGATION REVEALED FAILURE OF THE OUTBOARD BEARING CAUSING THE MAIN WHEEL ASSEMBLY TO FALL OFF THE STRUT . THE PART (BEARING) IS NOT APPROVED DUE TO THE FAILURE IT SUFFERED - THE TIRE HAD BEEN INSTALLED ON THE AIRCRAFT SINCE 12 OCTOBER 2002 OPERATING FOR 260:45 HRS AND 160 CYCLES, UNDER WORK ORDER 20020121 DATED 08 AUG 2002. DURING THE TIME OF OPERATION THE MWA WAS REMOVED AND REINSTALLED TO ACCOMPLISH A MAIN BRAKE REPLACEMENT.