EE WAS OPERATING U674 LUBE TRUCK WHEN THE LEFT REAR INSIDE DUAL TIRE BLEW. HE WENT TO INVESTIGATE AND AS HE REACHED FOR A ROCK THAT WAS STUCK BETWEEN THE DUALS THE OUTSIDE DUAL BLEW. THE IMPAC T CAUSED TWO BREAKS IN THE EE S RIGHT ARM AND FRACTURED HIS RIGHT THUMB. SURGERY WAS PERFORMED TO REPAIR THE ARM AND THE EE WAS TAKEN OFF WORK UNTIL HE FOLLOWS UP WITH HIS PHYSICIAN.