What was found
THE A-SYSTEM HYDRAULIC QUANTITY AND PRESSURE DROPPED TO ZERO WITH ILLUMINATION OF A PUMP LOW PRESSURE LIGHTS. THE A-SYSTEM HYDRAULIC FAILURE CHECKLIST WAS COMPLETED AND THE AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE A-SYSTEM HYDRAULC PRESSURE LINE ON RT WING AFT SPAR SECTION BETWEEN ENGINE AND LANDING GEAR FORWARD AND OUTBOARD OF STRUT RUPTURED. THE LINE WAS REPLACED USING FLEX LINE AND A DIP WAS ISSUED TO REPLACE THE FLEX LINE WITH A PERMANENT LINE WITHIN 1,200 HOURS OR 500 FLIGHTS. IN ADDITION, BOTH THE NR 1 AND NR 2 ENGINE DRIVEN HYDRAULIC PUMPS AND THE NR 2 ELECTRIC PUMP WERE REMOVED AND REPLACED. LEAK AND OPERATIONAL CHECKS WERE GOOD.