What was found
OIL COOLER IMPELLER WAS INSPECTED FOR CRACKS IN THE BLADE/SHOUD REGION IAW MFG RECOMMENDATIONS EVERY 100 HOURS OF OPERATION. 2 CRACKS WERE CONFIRMED AND SEVERAL OTHERS SUSPECTED. THE CURRENTLY MFG IMPELLER, 269D4530-001, IS APPARENTLY THE LATEST GENERATION THAT EVOLVED FROM PREVIOUS INCIDENTS AND FAILURES WHICH STILL DOES NOT WITHSTAND THE ROTATIONAL AND VIBRATIONAL STRESSES. THE MFG HAS BEEN INFORMED OF THE PROBLEM AND STILL OTHER AGENCIES AND OPERATORS HAVE EXPERIENCED THIS IDENTICAL PROBLEM. THIS PARTICULAR IMPELLER ( 269D4530-001) WAS MADE TO PERFORM WITH LONGER SERVICE LIFE OF 3000 HRS. FAILURE OCCURRED AT 1099.9 HRS TSN.