What was found
(CAN) DURING CRUISE, THE NR 1 HYDRAULIC SYSTEM SUFFERED A TOTAL HYDRAULIC SYSTEM FLUID LOSS. A FULL EMERGENCY LANDING WAS DECLARED INTO BASE, WHICH WAS CARRIED OUT WITHOUT FURTHER INCIDENT. UPON INSPECTION BY ENGINEERING IT WAS DISCOVERED THAT THE NR 1 HYDRAULIC PRESSURE MANIFOLD HAD SUFFERED A FAILURE OF THE AN815-10D UNION. THE AIRCRAFT MFG HAS PREVIOUSLY IDENTIFIED THIS DEFECT, AND A SYD 8-29-002 WAS ISSUED THAT PERMITS THE REPLACEMENT OF THE ALLOY UNION WITH A CORROSION RESISTANT STEEL UNION. AS A RESULT OF THIS INCIDENT, ALL DASH 8 / 315 SERIES AIRCRAFT OPERATED THIS AIRLINE HAVE HAD SYD 8-29-002 INCORPORATED.