What was found
(CAN) STARBOARD OUTER MAIN WHEEL SEPARATION AFTER TAKEOFF. ACFT ARRIVED WITH STARBOARD OUTER MAIN WHEEL MISSING ON LANDING, TAXIED TO PARKING WITHOUT FURTHER INCIDENT. INSPECTION WAS CARRIED OUT ON THE STARBOARD MAIN LEG AND AREAS OF THE FUSELAGE AND EMPENNAGE FOR COLLATERAL DAMAGE, NONE WAS NOTED. THE WHEEL NUT, SAFETY BOLTS AND SAFETY LOCK WIRE FOUND SECURE AND INTACT. THE MAIN WHEEL HAD DISAPPEARED WITH BOTH OF ITS BEARINGS EXCEPT FOR THE INNER RACE OF THE OUTER BEARING AND THE INNER RACE OF THE INNER BEARING WHICH REMAINED FASTENED TO THE AXLE, SOME DAMAGE TO BRAKE UNIT ROTOR WAS OBSERVED. NO OBVIOUS DAMAGE WAS OBSERVED ON OR ABOUT THE ASSOCIATED INNER MAIN WHEEL. EVENT IS UNDER INVESTIGATION.