As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT'S LEFT SIDE WINDOW DEPARTED AIRCRAFT DURING FLIGHT. PILOTS REPORTED NO ADVERSE FLIGHT CHARACTERISTICS AFTER WINDOW DEPARTED. PILOT REPORTED THAT WINDOW WAS CRACKED AT WING WINDOW PRIOR TO FLIGHT. SUSPECT CAUSE OF TOTAL FAILURE WAS WING WINDOW LEFT OPEN FOR COOLING AND BROKEN SECTION OF WINDOW WAS CAUGHT IN AIRFLOW CAUSING TOTAL FAILURE. NO OTHER DAMAGE TO AIRCRAFT.