What was found
HYDRAULIC PUMPS REMOVED TO COMPLY WITH 150-HR INSPECTION UNDER SUPPLEMENT 'F'. THESE PUMPS WERE POST-MODIFICATION 253202 WITH A PLASTIC BUSHING INSERT IN THE PUMP END. REMOVED THE DRIVE SHAFTS TO INSPECT THE BUSHING INSERTS. ON THE NR 1 HYDRUAULIC PUMP, DISCOVERED THE INSERT WAS CRACKED IN SEVERAL PLACES AND BEING HELD IN PLACE ONLY BY THE INTERNAL SPLINE OF THE PUMP. NR 2 PUMP HAD THE INSERT BADLY WORN, BUT STILL IN ONE PIECE. AN INSPECTION OF THE INTERNAL SPLINES OF NR 2 PUMP REVEALED THEY WERE WORN ALMOST TO THE POINT OF FAILURE. NR 1 PUMP'S INTERNAL SPLINES WERE OK. REPLACED NR 2 PUMP WITH A PRE-MOD 253202 AND INSTALLED NEW INSERT IN NR 1 PUMP. HYD SYS SERVICED, GRD RAN, A/C RETURNED TO SERVICE.