A B767 EICAS alerted C hydraulic qty in cruise so on approach to the filed destination the crew decl...

Narrative:

About 2 hours after departure; en route; we received an EICAS message: C hydraulic lo qty. Pulling up the status page showed the quantity at .49 and decreasing. We performed the proper QRH checklist and then maintenance and dispatch were advised. We planned on a flap 20 landing at our filed destination with alt flap extension using a long final and continued. When we checked in with center nearest our destination an emergency was declared. During the alt flap extension we got a le disagree EICAS and ran that checklist. When attempting to extend beyond flap 5 we also got a te disagree EICAS and ran that checklist as well as calling maintenance to see if they could help in case we overlooked anything and to get more flaps out. All efforts to get more flaps out were unsuccessful. After recalculating a new landing weight and landing distance for a flap 5 landing we decided a safe landing could be accomplished. With the captain flying; the approach; landing and rollout were uneventful. Using alt nose wheel steering we were able to proceed to the gate unassisted.

Original NASA ASRS Text

Title: A B767 EICAS alerted C HYD QTY in cruise so on approach to the filed destination the crew declared an emergency and while extending the flaps received EICAS TE DISAGREE and LE DISAGREE alerts which required additional QRH checklists before landing.

Narrative: About 2 hours after departure; en route; we received an EICAS message: C HYD LO QTY. Pulling up the Status page showed the quantity at .49 and decreasing. We performed the proper QRH checklist and then Maintenance and Dispatch were advised. We planned on a flap 20 landing at our filed destination with Alt flap extension using a long final and continued. When we checked in with Center nearest our destination an emergency was declared. During the Alt flap extension we got a LE Disagree EICAS and ran that checklist. When attempting to extend beyond flap 5 we also got a TE Disagree EICAS and ran that checklist as well as calling Maintenance to see if they could help in case we overlooked anything and to get more flaps out. All efforts to get more flaps out were unsuccessful. After recalculating a new landing weight and landing distance for a flap 5 landing we decided a safe landing could be accomplished. With the Captain flying; the approach; landing and rollout were uneventful. Using Alt nose wheel steering we were able to proceed to the gate unassisted.

Data retrieved from NASA's ASRS site as of July 2013 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1061913
Time
Date	201301
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Hydraulic Main System
Person 1
Function	First Officer Pilot Not Flying
Experience	Flight Crew Last 90 Days 240 Flight Crew Total 25500 Flight Crew Type 9000
Events
Anomaly	Aircraft Equipment Problem Critical

A B767 EICAS alerted C hydraulic qty in cruise so on approach to the filed destination the crew declared an emergency and while extending the flaps received EICAS te disagree and le disagree alerts which required additional QRH checklists before landing.