Md-11 captain reported that a 'hydraulic 3 elev off' alert was received during cruise.

Attributes
ACN	1650743
Time
Date	201905
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Night
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	Captain Pilot Flying
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

During cruise at FL390 received 'hydraulic 3 elev off' alert; hydraulic 3 quantity 4.9 gal. Hydraulic 3 quantity continued to 3.6 gal. Consulted maintenance control/operations via sat. Selected hydraulic 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 hydraulic 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 hydraulic 3 system.

Original NASA ASRS Text

Title: MD-11 Captain reported that a 'HYD 3 ELEV OFF' alert was received during cruise.

Narrative: 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.

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.