What was found
THE A HYDRAULIC SYSTEM QUANTITY AND PRESSURE DROPPED TO ZERO ON DESCENT INTO EWR. THE A SYSTEM PUMPS WERE TURNED OFF AND THE HYDRAULIC LOSS CHECKLIST WAS ACCOMPLISHED. THE AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE RT ENGINE A SYSTEM PRESSURE LINE LEAKING. THE LINE WAS REPLACED USING FLEX LINE. A DIP WAS ISSUED TO REPLACE THE FLEX LINE WITHIN 500 FLIGHTS OR 1200 FLIGHT HOURS, WHICHEVER COMES FIRST.