What was found
DURING CLIMB, CREW OBSERVED THE NR 1 HYD SYS DEPLETING. CREW ELECTED TO CONTINUE ON TO DESTINATION. NEAR DESTINATION, CREW DECLARED AN EMERGENCY AND LANDED WITHOUT FURTHER INCIDENT. LOSS OF THE NR 1 HYD SYS RESULTED IN THE LOSS OF WING FLAPS, INBD ROLL SPOILERS, LOWER RUDDER ACTUATOR, NORMAL BRAKING AND ANTI-SKID. A HYD LEAK WAS OBSERVED ON THE TAIL SECTION. FURTHER INVESTIGATION REVEALED 3 PIN HOLES ON THE PRESSURE SUPPLY HYD TUBE (P1) CONNECTING TO THE RUDDER DUAL PRESSURE REGULATOR. THE HOLES ARE LOCATED ON THE OUTSIDE OF A 180 ELBOW, THE HYD TUBE AND THE ENGINE DRIVEN PUMP WERE REPLACED AND THE ACFT RETURNED INTO SERVICE.