Air carrier widebody transport experienced loss of hydraulic quantity. Returned to departure airport...

Attributes
ACN	133113
Time
Date	199001
Day	Fri
Local Time Of Day	0001 To 0600
Place
Locale Reference	atc facility : las
State Reference	NV
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zla tracon : rno
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 6500 flight time type : 500
ASRS Report	133133
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency flight crew : overcame equipment problem none taken : unable
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

On initial push from lax indications of stuck hydraulic shut-off valve on #2 engine. Replaced valve and engine driven pump. Took off on normal flight and began losing hydraulic quantity in primary system. I flew the aircraft while captain and so executed appropriate checklists. Declared emergency and landed west/O incident at lax. I feel that proper maintenance procedures might have averted this problem. When performing the initial receiving aircraft checks almost all switches were in improper positions after returning from maintenance. This made me wonder if proper procedures were followed.

Original NASA ASRS Text

Title: ACR WDB EXPERIENCED LOSS OF HYDRAULIC QUANTITY. RETURNED TO DEP ARPT.

Narrative: ON INITIAL PUSH FROM LAX INDICATIONS OF STUCK HYD SHUT-OFF VALVE ON #2 ENG. REPLACED VALVE AND ENG DRIVEN PUMP. TOOK OFF ON NORMAL FLT AND BEGAN LOSING HYD QUANTITY IN PRIMARY SYS. I FLEW THE ACFT WHILE CAPT AND SO EXECUTED APPROPRIATE CHKLISTS. DECLARED EMER AND LANDED W/O INCIDENT AT LAX. I FEEL THAT PROPER MAINT PROCS MIGHT HAVE AVERTED THIS PROB. WHEN PERFORMING THE INITIAL RECEIVING ACFT CHKS ALMOST ALL SWITCHES WERE IN IMPROPER POSITIONS AFTER RETURNING FROM MAINT. THIS MADE ME WONDER IF PROPER PROCS WERE FOLLOWED.

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.