What was found
(CAN) DURING TAXI, HEAVY VIBRATION DEVELOPED ABOVE 10 KNOTS, FELT SIMILAR TO A FLAT. FOUND NR 4 MAIN WHEEL LOOSE ON AXLE, UNABLE TO REMOVE MAIN WHEEL NUT ASSEMBLY. RETORQUED NUT FOR TOW PURPOSES TO HANGER. WHEEL AND BRAKE ASSEMBLY REMOVED, AXLE SLEEVE LOOSE AND REMOVED. AREA FPI INSPECTED, NO CRACKS DETECTED. AXLE SLEEVE HAD COME OUT OF TANG KEY WAY. REPAIRED AXLE AND AXLE SLEEVE.