What was found
DURING CRUISE FLIGHT, THE CREW REPORTED LOSING THE NR 1 HYDRAULIC SYSTEM, QUANTITY AND SYSTEM. AN EMERGENCY AND AIRCRAFT WAS LANDED SAFELY WITH NO OTHER INCIDENTS REPORTED. GEAR DID GO DOWN AND LOCK SAFELY. MAINTENANCE REMOVED AND REPLACED THE NR 4 ENGINE DRIVEN HYDRAULIC PUMP IAW EMB MM. OPERATIONAL AND LEAK CHECK WAS GOOD AND AIRCRAFT WAS RETURNED TO SERVICE. (M)