A B737-700 returned with a flickering hydraulic low pressure light. This engine was replaced prior to release. Found the case drain line not connected during the engine change.

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Attributes
ACN	669001
Time
Date	200508
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : zzz.airport
State Reference	US
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	ground : maintenance
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
ASRS Report	669001
Person 2
Affiliation	company : air carrier
Function	maintenance : inspector
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : far non adherence : published procedure
Independent Detector	aircraft equipment other aircraft equipment : low press warning light other flight crewa other flight crewb
Resolutory Action	other
Consequence	other other
Factors
Maintenance	contributing factor : schedule pressure contributing factor : work cards performance deficiency : non compliance with legal requirements performance deficiency : testing performance deficiency : logbook entry performance deficiency : installation performance deficiency : inspection
Supplementary
Problem Areas	Chart Or Publication Maintenance Human Performance Aircraft
Primary Problem	Maintenance Human Performance

Narrative:

I was assigned to an engine change on a B737-700 aircraft with 3 other guys that had never performed this task before. During installation; a hydraulic line for the case drain was overlooked. It was tucked under a filter housing. It was overlooked by the mechanics and inspection and no indication was found on engine leak check or engine run-up. The aircraft was released and returned with a flickering low pressure light. The line found the hydraulic line disconnected and reconnected it. A new hydraulic pump was installed due to overtemp. I signed off work that I had not completed.

Original NASA ASRS Text

Title: A B737-700 RETURNED WITH A FLICKERING HYD LOW PRESSURE LIGHT. THIS ENG WAS REPLACED PRIOR TO RELEASE. FOUND THE CASE DRAIN LINE NOT CONNECTED DURING THE ENG CHANGE.

Narrative: I WAS ASSIGNED TO AN ENG CHANGE ON A B737-700 ACFT WITH 3 OTHER GUYS THAT HAD NEVER PERFORMED THIS TASK BEFORE. DURING INSTALLATION; A HYD LINE FOR THE CASE DRAIN WAS OVERLOOKED. IT WAS TUCKED UNDER A FILTER HOUSING. IT WAS OVERLOOKED BY THE MECHS AND INSPECTION AND NO INDICATION WAS FOUND ON ENG LEAK CHK OR ENG RUN-UP. THE ACFT WAS RELEASED AND RETURNED WITH A FLICKERING LOW PRESSURE LIGHT. THE LINE FOUND THE HYD LINE DISCONNECTED AND RECONNECTED IT. A NEW HYD PUMP WAS INSTALLED DUE TO OVERTEMP. I SIGNED OFF WORK THAT I HAD NOT COMPLETED.

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.