What was found
RDU - CREW REPORTED IN CRUISE FLIGHT AT 17,000 FEET WITH WINDSHIELD HEAT ON, A BRIGHT FLASH WAS OBSERVED FROM THE RIGHT WINDSHIELD FOLLOWED BY A LOUD POPPING SOUND. IT WAS OBSERVED THAT THE RIGHT OUTER PANE OF THE WINDSHIELD CRACKED IN THE SPIDER WEB PATTERN. THE AIRCRAFT MADE UNEVENTFUL LANDING IN RDU. UPON INVESTIGATION THE BROKEN WINDSHIELD, IT WS DETERMINED THERE WERE BURN MARKS BETWEEN THE PANE OF IN THE AREA OF TEMP SENSORS. THE WINDSHIELD WAS REPLACED WITH A NEW UNIT; A FULL FUNCTIONAL TEST OF THE WINDSHIELD HEAT SYSTEM WAS ACCOMPLISHED WITH NO OTHER DEFECTS NOTED. (M)