<< >> NASA ASRS Report 740339, May 2007

B757 diverted as a result of losing left hydraulic system fluid. Successful overweight landing accomplished.

Attributes
ACN	740339
Time
Date	200705
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : zzz.artcc
State Reference	US
Altitude	msl single value : 34000
Environment
Flight Conditions	VMC
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Operator	common carrier : air carrier
Make Model Name	B757-200
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	740339
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	flight crew : diverted to another airport flight crew : landed as precaution
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

About 30 mins into cruise flight; the left system hydraulic quantity RF was displaced. The value was about .43. Completed procedure in QRH and made the decision to divert to ZZZ for maintenance. Aircraft was well within performance limits for overweight landing. Prior to landing turn left hydraulic pumps back on; quantity continued to decrease to approximately .32 at touchdown. Turned pumps back off. Aircraft landed at 208000 pounds; 125 ft sink rate; normal landing. Emergency equipment was standing by. After clearing runway shut left engine down as a precaution. Taxi to gate under aircraft power.

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Original NASA ASRS Text

Title: B757 DIVERTED AS A RESULT OF LOSING LEFT HYD SYSTEM FLUID. SUCCESSFUL OVERWEIGHT LNDG ACCOMPLISHED.

Narrative: ABOUT 30 MINS INTO CRUISE FLT; THE L SYS HYD QUANTITY RF WAS DISPLACED. THE VALUE WAS ABOUT .43. COMPLETED PROC IN QRH AND MADE THE DECISION TO DIVERT TO ZZZ FOR MAINT. ACFT WAS WELL WITHIN PERFORMANCE LIMITS FOR OVERWT LNDG. PRIOR TO LNDG TURN L HYD PUMPS BACK ON; QUANTITY CONTINUED TO DECREASE TO APPROX .32 AT TOUCHDOWN. TURNED PUMPS BACK OFF. ACFT LANDED AT 208000 LBS; 125 FT SINK RATE; NORMAL LNDG. EMER EQUIP WAS STANDING BY. AFTER CLRING RWY SHUT L ENG DOWN AS A PRECAUTION. TAXI TO GATE UNDER ACFT PWR.

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.