A B737-300 lost 'B' hydraulic fluid from a leak in a recently replaced engine driven hydraulic pump.

Attributes
ACN	636538
Time
Date	200411
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : zzz.tracon
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 20000 flight time type : 11000
ASRS Report	636538
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
Resolutory Action	flight crew : declared emergency flight crew : landed in emergency condition other
Consequence	other
Factors
Maintenance	performance deficiency : installation
Supplementary
Problem Areas	Maintenance Human Performance Aircraft
Primary Problem	Aircraft

Narrative:

On climb out 'B' system hydraulic quantity began to decrease. Declare an emergency and asked for immediate vectors back to ZZZ. On final 'B' system engine driven pump low pressure light illuminated with master caution. Uneventful approach and landing was made at ZZZ. On arriving at the gate, hydraulic fluid was detected spraying out of the #2 engine driven hydraulic pump. Hydraulic pump had been replaced by maintenance earlier in the day and logbook cleared for operation.

Original NASA ASRS Text

Title: A B737-300 LOST 'B' HYD FLUID FROM A LEAK IN A RECENTLY REPLACED ENG DRIVEN HYD PUMP.

Narrative: ON CLBOUT 'B' SYS HYD QUANTITY BEGAN TO DECREASE. DECLARE AN EMER AND ASKED FOR IMMEDIATE VECTORS BACK TO ZZZ. ON FINAL 'B' SYS ENG DRIVEN PUMP LOW PRESSURE LIGHT ILLUMINATED WITH MASTER CAUTION. UNEVENTFUL APCH AND LNDG WAS MADE AT ZZZ. ON ARRIVING AT THE GATE, HYD FLUID WAS DETECTED SPRAYING OUT OF THE #2 ENG DRIVEN HYD PUMP. HYD PUMP HAD BEEN REPLACED BY MAINT EARLIER IN THE DAY AND LOGBOOK CLRED FOR OP.

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.