What was found
DURING PRE-FLIGHT WHILE TURNING RIGHT PROPELLER, HEARD AN UNUSUAL NOISE COMING FROM POWER SECTION. INSPECTED CHIP DETECTOR AND MAIN OIL SCREEN AND FOUND SMALL QUANTITIES OF METAL. REMOVED POWER SECTION FOR REPAIR. FOUND NR 4 BEARING RACE STARTING TO SPALL. CAUSED BY METAL FATIGUE. REINSTALLED POWER SECTION AFTER REPAIR. FLUSHED OIL SYSTEM PER P & W MM. ENGINE WAS RETURNED TO SERVICE IAW P & W MM, PROCEDURES, AND P & W TECH REP RECOMMENDATIONS. ENGINE TT, 4,618.1 HOURS. ENGINE TSO, 1,569.3 HOURS.