A B737-200 in climb between 12000 ft and 16000 ft diverted due to loss of 'a' system hydraulic pressure and quantity, caused by a loose 'B' nut on engine supply line.

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Attributes
ACN	522551
Time
Date	200102
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl bound lower : 12000 msl bound upper : 16000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Operator	common carrier : air carrier
Make Model Name	B737-200
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
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 : 5800 flight time type : 1600
ASRS Report	522551
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : far non adherence : published procedure
Independent Detector	aircraft equipment other aircraft equipment : a pressure and qty indicators other flight crewa
Resolutory Action	flight crew : diverted to another airport
Consequence	other
Factors
Maintenance	performance deficiency : inspection performance deficiency : testing
Supplementary
Problem Areas	Maintenance Human Performance Aircraft
Primary Problem	Maintenance Human Performance

Narrative:

During climb out from ZZZ we started to have 'a' system hydraulic low pressure caution lights flickering. Pressure gauge was fluctuating full scale. After a brief period all hydraulic fluid was lost. After completing the loss of 'a' system checklist we returned to the ZZZ airport with an uneventful landing. The ground crew towed the airplane to the gate. Maintenance found a loose 'B' nut on the main supply line in #1 engine.

Original NASA ASRS Text

Title: A B737-200 IN CLB BTWN 12000 FT AND 16000 FT DIVERTED DUE TO LOSS OF 'A' SYS HYD PRESSURE AND QUANTITY, CAUSED BY A LOOSE 'B' NUT ON ENG SUPPLY LINE.

Narrative: DURING CLBOUT FROM ZZZ WE STARTED TO HAVE 'A' SYS HYD LOW PRESSURE CAUTION LIGHTS FLICKERING. PRESSURE GAUGE WAS FLUCTUATING FULL SCALE. AFTER A BRIEF PERIOD ALL HYD FLUID WAS LOST. AFTER COMPLETING THE LOSS OF 'A' SYS CHKLIST WE RETURNED TO THE ZZZ ARPT WITH AN UNEVENTFUL LNDG. THE GND CREW TOWED THE AIRPLANE TO THE GATE. MAINT FOUND A LOOSE 'B' NUT ON THE MAIN SUPPLY LINE IN #1 ENG.

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.