What was found
(CAN) DURING PILOT`S PREFLIGHT INSPECTION, THE NR 3 TIRE WAS FOUND TO HAVE A BULGE IN THE TREAD. THE BULGE WAS AT THE INTERSECTION OF THE TREAD AND THE SIDEWALL. ONE INCH EXTENDED ACROSS THE TREAD FACE AND ONE INCH ACROSS THE SIDEWALL, FOR A TOTAL OF TWO INCHES IN DIAMETER. THE PROTRUSION WAS .25 INCHES IN HEIGHT AT THE CENTER. IAW AMM 32-41-01-210-801 THE NR 3 MAIN WHEEL WAS REPLACED PRIOR TO FLIGHT.