A B777 experienced a loss of center hydraulic system fluid. The flight crew continued to destination; declaring an emergency with approach ctrl.

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Attributes
ACN	733217
Time
Date	200703
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : zzzz.artcc
State Reference	FO
Altitude	msl single value : 36000
Environment
Light	Night
Aircraft 1
Controlling Facilities	artcc : zzzz.artcc
Operator	common carrier : air carrier
Make Model Name	B777 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
ASRS Report	733217
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : hyd quantity ind other flight crewa
Resolutory Action	flight crew : declared emergency flight crew : landed in emergency condition
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Once at cruise altitude I left the cockpit for the first break. After completion of the break the captain briefed me that the center hydraulic system had lost all the fluid. Captain had contacted the dispatcher and talked with maintenance control about the problem and elected to continue the flight to ZZZZ and declare an emergency with ZZZZ approach.

Original NASA ASRS Text

Title: A B777 EXPERIENCED A LOSS OF CENTER HYD SYS FLUID. THE FLT CREW CONTINUED TO DESTINATION; DECLARING AN EMERGENCY WITH APCH CTRL.

Narrative: ONCE AT CRUISE ALT I LEFT THE COCKPIT FOR THE FIRST BREAK. AFTER COMPLETION OF THE BREAK THE CAPT BRIEFED ME THAT THE CTR HYD SYS HAD LOST ALL THE FLUID. CAPT HAD CONTACTED THE DISPATCHER AND TALKED WITH MAINT CTL ABOUT THE PROB AND ELECTED TO CONTINUE THE FLT TO ZZZZ AND DECLARE AN EMER WITH ZZZZ APCH.

Data retrieved from NASA's ASRS site as of January 2009 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.