What was found
AFTER TAXI-OUT, PILOT CALLED BACK AND SAID HE WAS RETURNING BECAUSE HE HAD A 'FLAT SPOT' ON THE LEFT MLG TIRE. AS THE AIRCRAFT TAXIED IN, MAINTENANCE NOTICED THE TIRE WAS FLAT AND STOPPED HIM. WHEN THE WHEEL WAS REMOVED, A 4 INCH LONG CRACK WAS DISCOVERED IN THE BEAD AREA WHICH HAD EXPANDED OUTWARD AND BEGAN RUBBING ON A BRAKE BACKPLATE ASSEMBLY (064-02700) WHICH OVERHEATED AND CAUSED THE TIRE TO MELT AND DEFLATE.