Md-11 pilot reported slowly decreasing hydraulic fluid in the number 2 system; ultimately decreasing...

Attributes
ACN	1668087
Time
Date	201907
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZZ.ARTCC
State Reference	FO
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	MD-11
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Hydraulic System
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

In cruise at FL310 with autopilot 2 engaged; I noticed a flashing hydraulic 2 level one alert. We had a level 1 hydraulic 2 off. The system qty was 2.7. The captain gave me the aircraft and radios while we reviewed the hydraulic 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.

Original NASA ASRS Text

Title: 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.

Narrative: 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.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

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.