What was found
THE RIGHT WINDSHIELD CRACKED WHILE CLIMBING THROUGH FL 200. THE WINDHIELD HEAT HAD BEEN ON CONTINUOUSLY SINCE TAKEOFF FROM KAGC. THE PILOT STATED HE HEARD A LOUD POPPING NOISE JUST PRIOR TO THE WINDSHIELD CRACKING. THE PILOT FLYING DECLARED AN EMERGENCY TO ATC, REDUCED AIRSPEED, INITIATED A DESCENT TO 10,000 FEET AND ALTERED COURSE TO RETURN TO KAGC. THE AIRCRAFT LANDED WITHOUT FURTHER INCIDENT. INSPECTION AFTER LANDING REVEALED THE OUTER WINDSHIELD PLY ONLY WAS CRACKED IN A SPIDER WEB PATTERN ENCOMPASSING THE ENTIRE WINDSHIELD.