As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHL - FLT 1797 - ON CLIMB-OUT FROM PHL, EN ROUTE TO MCO, THE OUTER PANE ON THE CAPTAINS WINDSHIELD CRACKED. CAPTAIN REPORTED THAT THE LOWER LEFT CORNER ARCED AND GLOWED BEFORE CRACKING. FLIGHT RETURNED TO FIELD AT PHL AND LANDED WITHOUT FURTHER INCIDENT. AN EMERGENCY WAS DECLARED. MAINTENANCE REMOVED AND REPLACED THE CAPTAINS WINDSHIELD. OPERATIONAL CHECK OF WINDOW HEAT SYSTEM GOOD. (M)