What was found
(CAN) DURING AIRCRAFT TOWING, THE NAV 2 POSITION LIGHT CB POPPED. UNABLE TO RESET. DURING INVESTIGATION, FOUND THE 4 WIRES FROM THE LIGHT UNIT ASSY (7LA) BURNED ABOUT 8 INCHES LONG. WIRING WAS REPLACED AND LIGHT ASSEMBLY AND RELAY WERE REPLACED AS PRECAUTIONARY MEASURE. SB 30-0627-33-SB01 WILL BE INCORPORATED IN ALL AIRCRAFT TO UPGRADE THE NAVIGATIONAL LIGHT SYSTEM AND PREVENT THIS TYPE OF PROBLEM. (TC NR 20060502003)