What was found
P/N 772568QQ, PMA APPROVED QUALITY MANUFACTURER, PMA NR PQ2163MM, SUPPORT NR 17. ONE EACH FAILED UNDER HEAD RELEASING HEAD INTO TURBINE AREA CAUSING TURBINE DAMAGE AND PERFORMANCE DETERIORATION. BORESCOPE INSPECTION REVEALED ONE EACH TURBINE BLADE FRACTURED APPROXIMATELY ONE INCH FROM TIP. ENGINE REMOVED FOR REPAIR. BOLT FAILED DUE TO CADMIUM EMBRITTLEMENT. ALL BOLTS WHICH ARE SUSPECT ARE BEING REMOVED FROM SERVICE.