A B737-300 noted after pushback that 'a' system hydraulic fluid was being lost. Returned to gate and found 'a' system supply quick equipment disconnect connector not secured.

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Attributes
ACN	679238
Time
Date	200509
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	ground : maintenance
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
Qualification	technician : airframe technician : fcc technician : powerplant
Experience	maintenance technician : 15
ASRS Report	679238
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
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' hydraulics qty indication other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	contributing factor : schedule pressure performance deficiency : scheduled maintenance performance deficiency : testing performance deficiency : non compliance with legal requirements performance deficiency : installation
Supplementary
Problem Areas	Chart Or Publication Maintenance Human Performance Aircraft
Primary Problem	Maintenance Human Performance

Narrative:

'A' hydraulic system quick equipment disconnect was disconnected for routine maintenance on the acoustic filter. The quick equipment disconnect was connected after maintenance; but it must not have been fully engaged. System leak check was performed and hydraulic pressure was reported. After aircraft pushed from the gate; a loss of 'a' system occurred. Aircraft returned to the gate and called for maintenance. 'A' system quick equipment disconnect was found connected; but not fully engaged. Upon connecting quick equipment disconnect; aircraft was released.

Original NASA ASRS Text

Title: A B737-300 NOTED AFTER PUSHBACK THAT 'A' SYS HYD FLUID WAS BEING LOST. RETURNED TO GATE AND FOUND 'A' SYS SUPPLY QUICK EQUIP DISCONNECT CONNECTOR NOT SECURED.

Narrative: 'A' HYD SYS QUICK EQUIP DISCONNECT WAS DISCONNECTED FOR ROUTINE MAINT ON THE ACOUSTIC FILTER. THE QUICK EQUIP DISCONNECT WAS CONNECTED AFTER MAINT; BUT IT MUST NOT HAVE BEEN FULLY ENGAGED. SYS LEAK CHK WAS PERFORMED AND HYD PRESSURE WAS RPTED. AFTER ACFT PUSHED FROM THE GATE; A LOSS OF 'A' SYS OCCURRED. ACFT RETURNED TO THE GATE AND CALLED FOR MAINT. 'A' SYS QUICK EQUIP DISCONNECT WAS FOUND CONNECTED; BUT NOT FULLY ENGAGED. UPON CONNECTING QUICK EQUIP DISCONNECT; ACFT WAS RELEASED.

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.