What was found
NO FLAP LANDING DUE TO HYDRAULIC PUMP FAILURE. AIRCRAFT LANDED WITHOUT INCIDENT AT KOAK. AFTER LANDING, CREW NOTICED A PUDDLE OF HYDRAULIC FLUID ON GROUND. REPLACED DEFECTIVE RH HYDRAULIC SYSTEM FILTER MANIFOLD IAW CH 300 AMM 32-34-05. REPLACED DAMAGED O-RING ON THE RETURN LINE BASE NUT FITTING OF THE RUN AROUND VALVE. OPS CHECKS AND GEAR SWINGS GOOD—NO DEFECTS. FILTER P/N 945173-3; S/N PT0123. O-RING P/N NAS1612-8A.