B757 flight crew has a hydraulic failure in flight, resulting in use of alternate flap and gear extension. Emergency declared and diversion to airport with longer runway.

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Attributes
ACN	574982
Time
Date	200302
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : zzz.artcc
State Reference	US
Altitude	msl bound lower : 6000 msl bound upper : 25000
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : zzz.tracon tower : zzz.tower
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : approach descent : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 200 flight time total : 12000 flight time type : 200
ASRS Report	574982
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance controller : provided flight assist flight crew : landed in emergency condition flight crew : diverted to another airport flight crew : declared emergency other
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Had mechanical problem at FL250 low left hydraulic quantity. Resulted in loss of left hydraulic press, followed with flap and gear problems. Extended gear and flaps using alternate method, with 8200 pounds of fuel remaining and traffic very busy, decided to declare emergency to prevent critical fuel situation from developing. I had decided about 10 min prior to this point, to divert from ZZZ1 destination to ZZZ destination for longer runway. Landed normally.

Original NASA ASRS Text

Title: B757 FLT CREW HAS A HYD FAILURE IN FLT, RESULTING IN USE OF ALTERNATE FLAP AND GEAR EXTENSION. EMER DECLARED AND DIVERSION TO ARPT WITH LONGER RWY.

Narrative: HAD MECHANICAL PROB AT FL250 LOW L HYD QUANTITY. RESULTED IN LOSS OF L HYD PRESS, FOLLOWED WITH FLAP AND GEAR PROBS. EXTENDED GEAR AND FLAPS USING ALTERNATE METHOD, WITH 8200 LBS OF FUEL REMAINING AND TFC VERY BUSY, DECIDED TO DECLARE EMER TO PREVENT CRITICAL FUEL SIT FROM DEVELOPING. I HAD DECIDED ABOUT 10 MIN PRIOR TO THIS POINT, TO DIVERT FROM ZZZ1 DEST TO ZZZ DEST FOR LONGER RWY. LANDED NORMALLY.

Data retrieved from NASA's ASRS site as of July 2007 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.