What was found
PMA BOLT P/N 772568 QQ, REPLACEMENT FOR OEM BOLT P/N 772568, FAILED AFTER 7 HOURS AND 6 CYCLES IN SERVICE BOLT FRACTURED CAUSING HEAD TO BE INGESTED INTO THE N-2 COMPRESSOR DRIVE TURBINE WHERE EXTENSIVE DAMAGE WAS INFLICTED. LABORATORY ANALYSIS HAVE REVEALED THE LACK OF NICKLE HAD CAUSED CADMIUM INBRITTLEMENT. SUBMITTER RECOMMENDED REMOVING AND REPLACING ALL PMA BOLTS P/N 772568QQ FROM BATCH NR'S 30246 AND 30248 FROM SERVICE WITH LESS THAN 300 HOURS/CYCLES AT OPERATOR'S EARLIEST CONVENIENCE.