What was found
DURING DESCENT AIRCRAFT EXPERIENCED HYDRAULIC SYSTEM A PSI LOSS. THE HYDRAULIC SYSTEM A ENGINE DRIVEN PUMP LIGHT ILLUMINATED. THE PUMP WAS SHUT OFF PER CHECKLIST. SYSTEM A HYDRAULIC QUANTITY EVENTUALLY DROPPED TO ZERO. DECLARED AN EMERGENCY AND LANDED WITHOUT FURTHER INCIDENT. FOUND NLG RETRACT ACTUATOR HOSE RUPTURED. REPLACED THE RUPTURED HOSE. SERVICED BOTH HYD SYSTEMS A & B TO FULL. LEAKED CHECKED HOSE AND ACTUATOR. NO LEAKS NOTED. OK FOR SERVICE IAW MM 32-33-11-400-801. THE AIRCRAFT WAS GROUNDED.