What was found
ACFT TT: 8,511.9 HOURS. LANDINGS: 6,959. WHILE PERFORMING MFG 300-HOUR/12-MONTH INSPECTION A VOID/CRACK, MATERIAL WAS MISSING ON THE RT WINDSHIELD OUTER SURFACE IN THE LOWER FWD AREA UNDER THE DEFROST DUCT. THE DAMAGED AREA MEASURED APPROX .3125 INCH DEEP, .8750 INCH WIDE, AND 5 INCHES LONG WITH ADDITIONAL 1 INCH CRACKS EXTENDING FROM EACH END OF THE DAMAGED AREA. THE WINDSHIELD WAS INSTALLED 92-93, ACTT: 3,966.8 HRS, TT ON WINDSHIELD WAS 4,545.1 HRS. CAUSE OF DAMAGE UNKNOWN, AND THERE IS NO VISUAL EVIDENCE AS TO WHAT CAUSED THIS DAMAGE. SENT INFORMATION AND PHOTOS OF DAMAGE TO LEAR FOR EVALUATION. NOTE: THE DAMAGE CANNOT BE SEEN WITHOUT REMOVAL OF THE DEFROST DUCT.