What was found
DURING CRUISE FLIGHT, AT APPROX 3:22 AFTER TAKEOFF, OBSERVED NR2 ENGINE OIL QTY STARTED TO SHOW A POSSIBLE LOSS OF OIL AT A RATE OF 1 QT EVERY 3 MINUTES. WHEN QTY REACHED 3 QTS, ENGINE BROUGHT BACK TO IDLE & SHUTDOWN INITIATED. ACFT LANDED WITH A TOTAL FLIGHT TIME OF 6.1 HOURS. RT ENGINE COWLING OPENED AND EVIDENCE OF OIL LEAKAGE DISCOVERED. DURING MOTORING OF ENGINE, WITNESSED OIL LEAKING FROM BETWEEN ENGINE DRIVEN HYD PUMP & PUMP MOUNTING FLANGE ON GEARBOX. PUMP REMOVED & SPLINE SHAFT O-RING REPLACED. PUMP REINSTALLED IAW AMM 29-11-05. ENGINE MOTORED, NO LEAK DETECTED. ENGINE OPERATED FOR FURTHER INSP & NO LEAKS NOTED. NOTE: O-RING REPLACED 23.3 FLT HOURS EARLIER FOR EVIDENCE OF OIL LEAKING IN SAME AREA. ACFT OPERATED FOR 11.5 HOURS, SMALL AMOUNT OF OIL WITNESSED AT THE BOTTOM OF COWLING & ENGINE GEARBOX WAS AGAIN INSPECTED TO INSURE OIL WAS RESIDUAL FROM PREVIOUS OIL LOSS. THE QTY HAD DROPPED 1 QT IN 11.5 HOURS.