AFTERNOON SHIFT REPAIRMAN WAS ATTEMPTING TO ATTACH A MAINT TORCH TANK CART TO THE REAR HITCH OF HIS PARKED TRUCK ALONG THE SOUTH KILNS FEED HOPPER AREA. WHILE STANDING ON LOOSE STONE, PERPENDICULAR TO THE CART TOWING BAR, HE PULLED THE BAR ACROSS HIS BODY, LEFT TO RIGHT, FEET WENT OUT FROM UNDER HIM, HE FELL ON HIS RIGHT SIDE