Date: 202107
Local time of day: 0001-0600
Location: ZZZ.ARTCC, US
Flight conditions: VMC
Weather elements / visibility: Turbulence
Light: Night
Aircraft: MD-11
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Cruise
Airspace: Class A ZZZ
ATC / advisory: Center ZZZ
Aircraft component: Hydraulic Main System
Component problem: Malfunctioning
Reporter organization: Air Carrier
Reporter function: Pilot Flying; First Officer
Reporter qualification: Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP)
Human factors: Communication Breakdown; Troubleshooting
Anomaly: Aircraft Equipment Problem Critical
Detector: Person Flight Crew
When detected: In-flight
Result: Air Traffic Control Provided Assistance; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Overcame Equipment Problem; Flight Crew Landed in Emergency Condition; General Maintenance Action
Contributing factors: MEL; Procedure; Human Factors; Aircraft
Primary problem: Aircraft

Narrative: After passing ETP (Equal Time Point) on RZZZ1 eastbound past ZZZZZ at flight level 380. level 1 hydraulicaulic pump 3R off during cruise with associated amber 'T' displayed above pump on hydraulicraulic synoptic page. This is the standby pump for Engine 3. It was indicating an overheated condition. Operations notified via ACARS. Satcom was not working properly. Could not connect. Referenced QRH (Quick Reference Handbook). Next; level 1 hydraulic 3 off; system pressure zero; temp 35C; quantity decreasing rapidly from 10.4 gal to 1.8 gal. Pressure zero; temp 35C; both hydraulic 3 pumps off; system in auto. Referenced QRH; stabilized situation. Over the next 2 hours; contacted Maintenance; as a crew using CRM (Crew Resource Management) reviewed QRH and other sources for next possible scenarios. Attention to level 2; hydraulic 3 fail checklist. Observed during that time period; hydraulically quantity 3 increased to approximately 8.9 gal with a temperature of 3C prior to descending to ZZZ. With more than one plan/upcoming scenario ready to go; as a crew we started the descent into ZZZ. Direct ZZZZZ1 6000 ft. ILS XXR. We started to configure for the ILS at 16 miles due to a request from ATC to slow further to 180 kts. 'Slats extend'...about 4 seconds later level 2 alert hydraulic 3 fail. Complied with QRH; requested priority handling with ZZZ Tower; manually lowered the landing gear and proceeded to land uneventfully on runway XXR. AP2; flaps 35; no auto brakes; 400K landing weight. Restrictions for PW (Pratt Whitney) engine thrust reverser inop and limitations for turning right. Once clear of the runway we worked with ZZZ airport operations to confirm there was no excessive fluid/fire coming from the airplane. As expeditiously and safely as possible we taxied clear of the north runway complex so other aircraft could land. In contact with ZZZ Ramp/ZZZ Tower we devised a safe taxi plan to exit the North complex and meet a tug. Once at the designated point ZZZ Maintenance showed up promptly and towed us back.




Synopsis: MD-11 First Officer reported loss of the #3 hydraulic system in flight which resulted in a precautionary landing.