What was found
(CAN) ON APPROACH AND AFTER LANDING GEAR DOWN SELECTION COMPLETED, NR 2 HYDRAULIC SYSTEM INDICATED LOSS OF ALL FLUID. APPROACH TO LANDING WAS CONTINUED, FOLLOWING A NORMAL LANDING, CREW INSPECTED AC AND CONFIRMED A SIGNIFICANT HYD LEAK FROM AIRCRAFT'S EMPENNAGE AREA. FLIGHT WAS TERMINATED AND ENGINEERING ASSISTANCE REQUESTED. ENGINEERING INVESTIGATION CONFIRMED METAL FATIGUE FAILURE OF A CHECK VALVE BODY, WHICH ALLOWED LIBERATION OF ALL OF NR 2 HYDRAULIC SYSTEM FLUID TO ATMOSPHERE. FAILED CHECK VALVE WAS REPLACED AND FOLLOWING SERVICING OF THE NR 2 HYDRAULIC SYSTEM AIRCRAFT WAS RETURNED TO SERVICE. IT WAS NOTED THAT INSIDE OF THE VALVE SHOWED SIGNS OF CORROSION. TSN=11366.21 HRS