B767-300 and 300 ER
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Aircraft Equipment Problem Less Severe
Flight Crew Diverted; Flight Crew Landed As Precaution; General Maintenance Action
Aircraft
While acting as the [relief pilot] and while on my rest period I was awakened by the number 1 FA and informed that the Captain was requesting my assistance in the flight deck ASAP in reference to an emergency. After returning to the flight deck; the Captain informed me that the aircraft was rapidly losing hydraulic fluid from the Center Hydraulic System and that we were diverting to [a nearby alternate]. Landing gear was lowered at FL200 and within all operational limitations before the complete loss of the center hydraulic system. Aircraft was configured for landing approximately 40 miles from [the alternate] (Flaps 20 landing) and all QRH checklist and emergency procedures were followed. The Captain executed a very soft overweight landing/touch down in VFR conditions. After the Captain stopped the aircraft on the runway; both engines were shut down and [ground personnel] inspected the aircraft. After the aircraft was found to be safe it was towed to a hard stand where all of the passengers and crew members were deplaned without further incident. Maintenance personnel arrived on scene and [were] informed of the above mentioned incident.
B767-300ER First Officer reported diverting to an alternate airport after experiencing the loss of the Center Hydraulic System.