What was found
(CAN) DURING APPROACH, EICAS MESSAGE, HYD 3 LOW PRESS, WAS DISPLAYED. NR 3 HYDRAULIC PRESSURE AND QTY INDICATED ZERO ALTHOUGH NR 1 AND NR 2 HYDRAULIC SYSTEM WAS NORMAL. FLIGHT CREW DECLARED EMERGENCY LANDING DUE TO NOSE STEERING NOT AVAILABLE AFTER LANDING. LEAK OF HYDRAULIC FLUID FROM 3A ACMP, ALTERNATING CURRENT MOTOR PUMPS WAS CONFIRMED, PN 848847.