MD-11
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Situational Awareness
Aircraft Equipment Problem Less Severe
Flight Crew Landed in Emergency Condition
Aircraft
During cruise at FL390 received 'HYD 3 ELEV OFF' alert; HYD 3 quantity 4.9 gal. HYD 3 quantity continued to 3.6 gal. Consulted Maintenance Control/Operations via sat. Selected HYD manual and turned engine pumps off to conserve fluid. [Requested priority handling] with Center and requested XXC and 20 mile final. Turned back on pumps for landing and received HYD 3 QTY LO. Gear extended normally. After normal landing had trucks inspect aircraft and taxied to gate. Final quantity 1.6 gal. Failed O-ring in HYD 3 system.
MD-11 Captain reported that a 'HYD 3 ELEV OFF' alert was received during cruise.