What was found
WHILE IN CRUISE AT 38,000 FT THE FLIGHT CREW HEARD A POPPING NOISE AND NOTICED A VERTICAL CRACK IN THE PILOT'S WINDSHIELD. THEY STARTED DESCENT (THEIR SCHEDULED DESTINATION). APPROX 10 MINUTES LATER THE CREW HEARD ANOTHER POPPING NOISE AND NOTED A VERTICAL CRACK IN THE CO-PILOT'S WINDSHIELD. THE ACFT LANDED UNEVENTFULLY. MX CONTACTED MFG TECH REP AND DESCRIBED THE DOUBLE WINDSHIELD FAILURE. MFG ADVISED MX THAT WHILE A DOUBLE WINDSHIELD FAILURE IS NOT COMMON, IT HAS HAPPENED SEVERAL TIMES IN THE PAST. MFG`S THEORY WAS BOTH WINDSHIELDS WERE FATIGUED SO WHEN ONE FAILED IT PLACED ADDITIONAL STRESS ON THE REMAINING WINDSHIELD ASSY CAUSING IT TO FAIL. BOTH WINDSHIELDS WERE REPLACED.