What was found
CENTER HYDRAULIC PRESSURE EICAS ON APPROACH. QUANTITY IN CENTER REACHED 0.08. ALTERNATE FLAP AND GEAR EXTENSION ENGAGED. HYDRAULIC QTY WAS FULL AT TOP OF DESCENT AND EMPTY WHEN FLAPS 5 SELECTED. DUE TO IRREGULAR OPERATIONS CREW ELECTED AN EMERGENCY DESCENT. LANDING WAS WITHOUT INCIDENT AND NO ADDITIONAL PRECAUTIONARY ACTIONS. ON ARRIVAL, AIRCRAFT WAS GROUNDED FOR UNSCHEDULED MAINTENANCE. WORK IN PROGRESS