What was found
MIA - FLT 807 - BLOCK TURN BACK, AT THE BEGINNING OF TAKEOFF HEARD A LOUD NOISE FROM LEFT MLG WHEEL WELL. RETURNED TO RAMP. MAINTENANCE FOUND NR 6 MLG WHEEL INBOARD HALF FLANGE HAD SEPARATED AND TIRE WAS MISSING. WHEEL PARTS AND TIRE WERE RECOVERED. NR 6 MLG TIRE ASSY WAS CHANGED, AND NR 5 WAS CHANGED AS A PRECAUTIONARY MEASURE. THE CAUSE OF THE WHEEL FAILURE REMAINS UNDER INVESTIGATION. (M)