What was found
PILOT'S WINDSHIELD INNER PANE SUSTAINED SEVERE CRACKING AT FL 330. PILOT REPORTED CABIN DIFFERENCE OF 6.5 PSI AND OAT OF MINUS 41 DEGREES CELSIUS AT THE TIME OF THE WINDSHIELD FAILURE. PILOT STATED WINDSHIELD HEAT HAD BEEN ON FOR APPROXIMATELY 1.5 HOURS. PILOT ALSO REPORTED PARTICLES OF THE WINDSHIELD HAD BEGUN DROPPING ONTO THE GLARE SHIELD PRIOR TO LANDING. POSSIBLE CAUSE UNKNOWN. RECOMMENDATION: NONE AT THIS TIME. WINDSHIELD INSTALLED: MAY 1996.