B767-300 and 300 ER
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical
Flight Crew Landed As Precaution; Flight Crew Diverted; General Declared Emergency
Aircraft
During cruise flight approximately 1.5 hours [into flight]; FL340; observed 'RF' indication on center hydraulic system; started clock and determined constant decreasing quantity. Declared emergency [and] diverted to [nearest suitable airport]. Post flight confirmed center hydraulic fluid leak.
B767-300ER Captain reported inflight loss of center hydraulic system. Flight diverted to nearest suitable airport.