What was found
DURING FLIGHT FROM CCS TO SCL PILOTS NOTICED NR 1 ENGINE HAD LOSS OF OIL PRESSURE AND OIL QUANTITY. CREW FOLLOWED SHUTDOWN PROCEDURES FOR NR 1 ENGINE. ON SHUTDOWN CREW NOTED THE FOLLOWING: OIL QTY: 1 QT., OIL TEMP: 156 DEG., OIL PRESSURE: 168. CREW RETURNED TO CCS WITH NO FURTHER INCIDENT. INVESTIGATION SHOWED VISIBLE EXTERNAL OIL LEAK. FOUND OIL LEAK AT REAR HYDRAULIC PUMP DRIVE SEAL. REMOVED AND REPLACED THE DRIVE SEAL (P/N: 70R943) PER PW79-22-01 AMD AMM 80-12-01 AND PERFORMED HIGH POWER RUN UP. LEAK AND OP CHECK GOOD. NO LEAK NOTED. AIRCRAFT HAS CURRENTLY FLOWN 5 LEGS WITH NO FURTHER INCIDENT.