What was found
(CAN) DURING CRUISE AT 13,000 FT, THE CREW HEARD STRANGE SOUND LIKE HOWLING MICROPHONE FOR ABOUT 2 MINUTES FOLLOWED BY NR 1 ENG HYD PUMP, NR 1 RUD HYD, ROLL SPOILER INBD HYD AND RUD PRESS CAUTION LIGHTS. THEY ALSO CONFIRMED ZERO INDICATION OF NR 1 HYD FLUID QTY AND PRESSURE. CREW DECLARED AN EMERGENCY AND UNEVENTFULLY LANDED. TROUBLESHOOTING REVEALED THAT THE FLUID LEAKAGE FROM PRESSURE HYD LINE BETWEEN NR 1 EDP AND MANIFOLD. THEY FOUND THE SLEEVE CRACKED CIRCUMFERENTIALLY AT THE FITTING WHICH RESULTED THE COMPLETE LOSS OF NR 1 SYS FLUID.