B767-300 and 300 ER
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 30; Flight Crew Total 11000; Flight Crew Type 3300
Aircraft Equipment Problem Critical
Air Traffic Control Provided Assistance; Flight Crew Diverted; Flight Crew Took Evasive Action; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Overcame Equipment Problem; Flight Crew Landed in Emergency Condition
Aircraft
Encounter at 30;000 feet we received a 'C HYD QTY' EICAS message. Center hydraulic quantity was at 0.48 and decreasing. Contacted Flight Control and decided to divert. We decided to try to land while we still had center hydraulic pressure. We kept our speed up and received an ARTR (Amended Release to Read) for change of destination. It began to appear that we would not land prior to losing all center hydraulic fluid; so we descended about 50 NM early and extended the landing gear with 0.13 in the center reservoir. The gear extended normally; but when we selected Flaps 1 we lost all center hydraulic pressure. We followed AOM procedures for lost C HYD pressure; [advised ATC] and landed. We had a 757 Captain jump seating with us and we use him to aid the FO (First Officer) as PM (Pilot Monitoring) in executing the non-normal checklist and procedures.
B767 Captain reported hydraulic system malfunction during cruise.