Narrative:

During cruise flight; left hydraulic quantity EICAS came up. Left system was down to .46. Complied with checklist; shut off left system hydraulic pumps; and quantity stopped decreasing. On arrival turned left pumps back on to configure; and quantity decreased to about .15. We were able to configure normally; and taxi to the gate. Supplemental information from acn 804846: we contacted dispatch which in turn contacted maintenance. We conferred with maintenance and we agreed that there was most likely a leak and there was nothing else that could be done. Dispatch indicated he would inform tower of our situation and they would have the emergency equipment waiting and a tow should we need it.

Google
 

Original NASA ASRS Text

Title: B757-200 FLT CREW EXPERIENCES LOW HYDRAULIC QUANTITY IN THE LEFT SYSTEM. FOLLOW QRC CHECKLIST AND PROCEED TO DESTINATION.

Narrative: DURING CRUISE FLT; L HYD QUANTITY EICAS CAME UP. L SYS WAS DOWN TO .46. COMPLIED WITH CHKLIST; SHUT OFF L SYS HYD PUMPS; AND QUANTITY STOPPED DECREASING. ON ARR TURNED L PUMPS BACK ON TO CONFIGURE; AND QUANTITY DECREASED TO ABOUT .15. WE WERE ABLE TO CONFIGURE NORMALLY; AND TAXI TO THE GATE. SUPPLEMENTAL INFO FROM ACN 804846: WE CONTACTED DISPATCH WHICH IN TURN CONTACTED MAINT. WE CONFERRED WITH MAINT AND WE AGREED THAT THERE WAS MOST LIKELY A LEAK AND THERE WAS NOTHING ELSE THAT COULD BE DONE. DISPATCH INDICATED HE WOULD INFORM TWR OF OUR SITUATION AND THEY WOULD HAVE THE EMER EQUIP WAITING AND A TOW SHOULD WE NEED IT.

Data retrieved from NASA's ASRS site as of May 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.