<< >> NASA ASRS Report 679259, November 2005

B737-300 was dispatched after replacement of the 'a' system pressure module. At trip termination; found 'a' system hydraulic quantity low. Found 'a' system supply line quick disconnect connector not secured.

Attributes
ACN	679259
Time
Date	200511
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 : lead technician
ASRS Report	679243
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : published procedure non adherence : far
Independent Detector	aircraft equipment other aircraft equipment : 'a' system hyd qty ind other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	contributing factor : schedule pressure performance deficiency : installation performance deficiency : non compliance with legal requirements performance deficiency : inspection performance deficiency : testing performance deficiency : repair
Supplementary
Problem Areas	Maintenance Human Performance Aircraft Chart Or Publication
Primary Problem	Maintenance Human Performance

Narrative:

Right&right 'a' system module due to 'a' system low lights and hydraulic quantity empty indication. Module check valve found to be blown. 'A' system module removal done in accordance with maintenance manual. Secured all lines to module and reconnected quick disconnect lines to reservoirs. Leak checked all connections. Callback conversation with reporter revealed the following information: the reporter stated the problem was not the new pressure module that was installed; but the supply line quick disconnect connector was not properly installed and locked. This fitting leaked in-flight and the 'a' system quantity was found low at trip termination. The 'a' system supply line quick disconnect fitting was found leaking. Connector fitting was removed and installed correctly.

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Original NASA ASRS Text

Title: B737-300 WAS DISPATCHED AFTER REPLACEMENT OF THE 'A' SYS PRESSURE MODULE. AT TRIP TERMINATION; FOUND 'A' SYS HYD QUANTITY LOW. FOUND 'A' SYS SUPPLY LINE QUICK DISCONNECT CONNECTOR NOT SECURED.

Narrative: R&R 'A' SYS MODULE DUE TO 'A' SYS LOW LIGHTS AND HYD QUANTITY EMPTY INDICATION. MODULE CHK VALVE FOUND TO BE BLOWN. 'A' SYS MODULE REMOVAL DONE IN ACCORDANCE WITH MAINT MANUAL. SECURED ALL LINES TO MODULE AND RECONNECTED QUICK DISCONNECT LINES TO RESERVOIRS. LEAK CHKED ALL CONNECTIONS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE PROB WAS NOT THE NEW PRESSURE MODULE THAT WAS INSTALLED; BUT THE SUPPLY LINE QUICK DISCONNECT CONNECTOR WAS NOT PROPERLY INSTALLED AND LOCKED. THIS FITTING LEAKED INFLT AND THE 'A' SYS QUANTITY WAS FOUND LOW AT TRIP TERMINATION. THE 'A' SYS SUPPLY LINE QUICK DISCONNECT FITTING WAS FOUND LEAKING. CONNECTOR FITTING WAS REMOVED AND INSTALLED CORRECTLY.

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.