B767 flight crew has the left hydraulic fail; declares emergency and lands.

Attributes
ACN	701680
Time
Date	200606
Local Time Of Day	0001 To 0600
Place
Locale Reference	atc facility : zzz.artcc
State Reference	US
Altitude	msl single value : 30000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zzzz.artcc
Operator	common carrier : air carrier
Make Model Name	B767-300 and 300 ER
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	701680
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	flight crew : landed as precaution flight crew : overcame equipment problem flight crew : declared emergency
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

Left hydraulic system low quantity light with quantity slowly decreasing. Emergency declared with center and returned to ZZZ. Approximately 30000 pounds of fuel dumped and overweight landing at ZZZ. Aircraft weight at landing 330000 pounds. Uneventful landing and taxi to gate. No hot brakes occurred at parking.

Original NASA ASRS Text

Title: B767 FLT CREW HAS THE L HYD FAIL; DECLARES EMER AND LANDS.

Narrative: L HYD SYS LOW QUANTITY LIGHT WITH QUANTITY SLOWLY DECREASING. EMER DECLARED WITH CTR AND RETURNED TO ZZZ. APPROX 30000 LBS OF FUEL DUMPED AND OVERWT LNDG AT ZZZ. ACFT WT AT LNDG 330000 LBS. UNEVENTFUL LNDG AND TAXI TO GATE. NO HOT BRAKES OCCURRED AT PARKING.

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.