What was found
DURING THE MONTH OF JANUARY, SEVEN 332D-11T VERTICAL GYROS (P/N 622-4565-001) FAILED. THE TIMES FOR THE VG'S WERE: 1,639.3 HRS ON N NR 145SK; 5,375.1 HRS ON N NR 79SK; 6,125.4 ON N NR 801SK; 2,328.9 HRS ON N NR 831SK; 3,063.1 HRS ON N NR 881SK; 6,820.9 HRS ON N NR 891SK; AND 6,651.4 HRS ON N NR 901SK. THE AVERAGE TIME OF REMOVAL WAS 4,572.0 HOURS FOR THESE SEVEN VG'S. WHEN THE VG'S WERE SENT OUT FOR REPAIR OR OVERHAUL, THE TEAR-DOWN REPORTS RETURNED WITH THE UNITS SHOWING ALL BUT ONE HAD ROTOR BEARINGS THAT EITHER FAILED OR WERE ROUGH. REF: OPERATOR CONTROL NRS S2YA97006, AND 97ZZZX1791, 97ZZZX1792, AND 97ZZZX1794 THROUGH 97ZZZX1796.