MD-11
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Troubleshooting; Situational Awareness
Aircraft Equipment Problem Critical
Flight Crew Overcame Equipment Problem; General Maintenance Action
Aircraft
In cruise at FL310 with Autopilot 2 engaged; I noticed a flashing HYD 2 level one alert. We had a level 1 HYD 2 off. The system QTY was 2.7. The Captain gave me the aircraft and radios while we reviewed the HYD off and fail checklists. The Captain made a SATCOM call to [Dispatch/Maintenance Control] and they concurred that we were okay to continue to destination. Over the next 3 hours; the QTY decreased to 0. At top of descent; the Captain took over as Pilot Flying. We configured early and landed in ZZZZ without any issues. The Hydraulic System developed a leak and shut down at 2.5. Over the next 4 hours it slowly decreased to 0 and a system fail annunciated.
MD-11 pilot reported slowly decreasing hydraulic fluid in the Number 2 system; ultimately decreasing to zero; which resulted in a precautionary landing at the destination airport.