B767 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 230; Flight Crew Total 30000
Aircraft Equipment Problem Critical
Flight Crew Landed in Emergency Condition; General Declared Emergency
Aircraft
Center hydraulic system low pressure. Followed QRH; unable to extend flaps beyond 5 due to LE and TR flap disagree.
About 2 hours after departure; we received an ECAS message: C Hyd Low Quantity. Pulling up the status page showed the quantity at .49 and decreasing. We preformed the proper QRH checklist and then Maintenance and Dispatch were advised. We planned on a Flap 20 landing with an Alt flap extension using a long final and continued to destination. When we checked in with Center and an emergency was declared. They were advised about the loss of Center Hydraulics resulting in some degradation of the flight controls and the loss of some aircraft systems. We requested emergency equipment to stand by. About this time the Captain made a PA explaining what was going to take place. Bingo fuel levels were discussed so as to not get caught up in the problem and run low on fuel. Once we started doing the Alt flap extension procedure we got a LE Flap Disagree ECAS and preformed that check list. With attempted flap extension beyond 5 we got a TE Flap Disagree ECAS and preformed that checklist also as the flaps would not extend beyond 5. Maintenance was called on the radio during this to assist with trouble shooting and aid in getting more flap out but all attempts were unsuccessful. A new landing distance for a Flap 5 landing at new gross landing weight was calculated and all crew agreed we could land safely. Captain performed the Flap 5 landing with touch down and roll out uneventful. We had told Tower before the landing we didn't think we could clear the runway once we were stopped with potential nose wheel steering inoperable but that was not the case. After landing using alt nose wheel steering we were able to taxi unassisted to the gate.
B767 flight crew experiences loss of the Center Hydraulic system two hours into a long range flight. When the flaps are extended using the alternate flap switches a LE disagree is encountered immediately and dealt with using QRH procedures. The TE flaps exhibit the same malfunction after 5 degrees of extension; resulting in landing in this configuration.