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A B737-700 on taxi out #1 engine had flickering hydraulic low pressure warning and high temperature. Found case drain line not connected.
| Attributes | |
| ACN | 667805 |
| Time | |
| Date | 200508 |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : airframe |
| ASRS Report | 667805 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : inspector |
| ASRS Report | 667644 |
| 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 : high temp ind low press warning other flight crewa other flight crewb |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other other |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : inspection performance deficiency : installation performance deficiency : logbook entry performance deficiency : non compliance with legal requirements performance deficiency : training performance deficiency : scheduled maintenance |
| Supplementary | |
| Problem Areas | Aircraft Chart Or Publication Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
An inexperienced crew was assigned a 'drop in' engine change from the line. No one had performed a -700 engine change before. On installation of new engine; the hydraulic case drain line was not installed. The line was tucked under the filter housing and was not easily visible. This was overlooked by myself and others; and no indication was found on engine run-up. The aircraft was released and returned from taxi out with a flickering low pressure light. The line was found disconnected. It was reconnected; and a new hydraulic pump was installed due to overtemp.
Original NASA ASRS Text
Title: A B737-700 ON TAXI OUT #1 ENG HAD FLICKERING HYD LOW PRESSURE WARNING AND HIGH TEMP. FOUND CASE DRAIN LINE NOT CONNECTED.
Narrative: AN INEXPERIENCED CREW WAS ASSIGNED A 'DROP IN' ENG CHANGE FROM THE LINE. NO ONE HAD PERFORMED A -700 ENG CHANGE BEFORE. ON INSTALLATION OF NEW ENG; THE HYD CASE DRAIN LINE WAS NOT INSTALLED. THE LINE WAS TUCKED UNDER THE FILTER HOUSING AND WAS NOT EASILY VISIBLE. THIS WAS OVERLOOKED BY MYSELF AND OTHERS; AND NO INDICATION WAS FOUND ON ENG RUN-UP. THE ACFT WAS RELEASED AND RETURNED FROM TAXI OUT WITH A FLICKERING LOW PRESSURE LIGHT. THE LINE WAS FOUND DISCONNECTED. IT WAS RECONNECTED; AND A NEW HYD PUMP WAS INSTALLED DUE TO OVERTEMP.
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.