What was found
DURING POST FLIGHT INSPECTION, FOUND NR 4 WINDOW, ESCAPE HATCH, CRACKED IN HALF. THE CREW REPORTED NO ABNORMAL NOISES OR CHANGE IN PRESSURIZATION. THIS FLIGHT HAD NO PASSENGERS ONBOARD AND THE F/A DID NOT NOTICE ANYTHING ABNORMAL DURING THE FLIGHT. UPON INSPECTION OF THE WINDOW, NOTICED NO VISUAL FOD DAMAGE TO THE INTERIOR OR EXTERIOR FOR THE WINDOW, WHICH COULD HAVE LEAD TO THIS MALFUNCTION. MFG HAS BEEN NOTIFIED OF THIS INCIDENT.