What was found
ON CLIMB OUT, CREW HAD A LOSS OF THE NR 1 HYD SYS. FLIGHT CONTINUED TO DESTINATION WHERE AN EMERGENCY WAS DECLARED DUE TO NO BRAKE OR STEERING. ACFT LANDED UNEVENTFULLY. MX FOUND A PIN HOLE IN THE NR 1 HYD SYS PRESSURE LINE (PN 82974010-119) (IPC 29-10-00, FIG 15, ITEM 170A) IN THE LT NACELLE. LINE WAS REPLACED. THE NR 1 HYD SYS SUCTION LINE (PN 82970009-399) (ITEM 190B) WAS ALSO REPLACED DUE TO CHAFING. THE NR 1 ENGINE DRIVEN PUMP (PN 570347) WAS REPLACED DUE TO HAVING RUN FOR LONGER THAN 5 MINUTES WITHOUT HYD FLUID. CASE, PRESSURE AND RETURN FILTERS WERE REPLACED, FOLLOWED BY BLEEDING, ENGINE RUNS AND FUNCTION/LEAK CHECKS WITH NO FURTHER FAULTS FOUND.