What was found
AFTER TAKEOFF FROM DFW, THE 'A' SYSTEM HYDRAULIC QUANTITY WENT TO ZERO. THE AIRCRAFT RETURNED TO DFW AND LANDED WITHOUT FURTHER DIFFICULTIES. REMOVED AND REPLACED HYDRAULIC HOSE TO NR 2 ENGINE DRIVE HYDRAULIC PUMP. ALSO, REPLACED NR 1 AND NR 2 ENGINE DRIVEN HYDRAULIC PUMPS AND ASSOCIATED FILTERS IAW B727 MM 29-11. RESERVICED SYSTEM, THEN OPERATIONALLY AND LEAK CHECKED GOOD. RETURNED THE AIRCRAFT TO SERVICE. (M)