What was found
THIS IS THE SECOND DUPLEX BEARING FAILURE OF THIS TYPE IN LAST 6 MONTHS. BEARINGS FAILED WITH 1,000 HOURS OR LESS. PREVIOUS BEARING, SN 17910, FAILED AT 915.1 HOURS. BEARINGS ARE NORMALLY CONDITIONAL ITEMS AND SELDOM NEED CHANGING AT 4,800-HOUR OVERHAUL PERIOD OF SWASHPLATE.