What was found
DURING AIRFRAME REFURBISHMENT, EMERGENCY EXIT WINDOW WAS FOUND CRACKED AND BROKEN BETWEEN PERIPHERY OF WINDOW AND SCREW HOLES AT 6 CONSECUTIVE HOLE LOCATIONS. RETAINER RING HAD BEEN PREVIOUSLY INSTALLED. DAMAGE WAS NOT APPARENT UNTIL RING WAS REMOVED FOR WINDOW REMOVAL. EXTREME CARE SHOULD BE EXERCISED IN INSTALLATION TO ASSURE HOLES ARE PROPERLY ALIGNED AND SIZED, AND SCREWS ARE TORQUED EVENLY AND SLOWLY IN SMALL INCREMENTS.