MD-11
Flight Crew Last 90 Days 80; Flight Crew Total 9000; Flight Crew Type 1200
Aircraft Equipment Problem Critical
General Declared Emergency
Aircraft
Flight crew received message HYD 3 ELEV OFF. Noticed that hydraulic fluid was decreasing. Ran checklist and called [Maintenance] and [Operations] via Sat phone. Fluid decreased to the point of having only .1 gallon left in the HYD 3 system upon landing. HYD 3 fail message came on at 1.0 gallons. Decision was made to declare an emergency on landing due to some lost system components. Landing was uneventful.
[Enroute on an overwater flight] a level 1 HYD 3 ELEV OFF/3-2 NRMP INOPERATIVE alert was displayed. System 3 hydraulic quantity was slowly leaking out of the system. We reviewed the QRH and turned off the respective pumps to conserve fluid. We decided to continue on towards [destination] and monitor system quantity. Approximately 1.5 hours out all fluid was lost and we declared an emergency through our Dispatcher. When we arrived in the [destination] area we configured for landing using the appropriate checklists and landed without problem.
MD-11 flight crew reported declaring an emergency after loss of #3 hydraulic system. They continued to destination for a normal landing.