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A B737-300 was displaced in non compliance with an AC motor hydraulic pump replaced for overheating, but the case drain filter not inspected or replaced.
| Attributes | |
| ACN | 592327 |
| Time | |
| Date | 200308 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa.artcc |
| 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 : powerplant |
| Experience | maintenance technician : 20 |
| ASRS Report | 592327 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : pump temp indication other flight crewa other flight crewb |
| Factors | |
| Maintenance | performance deficiency : non compliance with legal requirements performance deficiency : fault isolation performance deficiency : logbook entry performance deficiency : inspection performance deficiency : installation |
| Supplementary | |
| Problem Areas | Aircraft Chart Or Publication Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
Replaced a 'B' hydraulic system electric motor driven hydraulic pump due to overheating. During next flight, new pump overheated. Debris was found in case drain filter. Case drain filter was replaced to fix overheat problem. I did not check or change the case drain filter during the pump change because the case drain and pressure filters were inspected the previous day (for an overheat) and no debris was found, indicating the pump was not overheating due to mechanical failure. If the pump is being replaced for other than a mechanical failure, the filter does not have to be replaced (reference maintenance manual 29-15-22, step 2.F.12).
Original NASA ASRS Text
Title: A B737-300 WAS DISPLACED IN NON COMPLIANCE WITH AN AC MOTOR HYD PUMP REPLACED FOR OVERHEATING, BUT THE CASE DRAIN FILTER NOT INSPECTED OR REPLACED.
Narrative: REPLACED A 'B' HYD SYS ELECTRIC MOTOR DRIVEN HYD PUMP DUE TO OVERHEATING. DURING NEXT FLT, NEW PUMP OVERHEATED. DEBRIS WAS FOUND IN CASE DRAIN FILTER. CASE DRAIN FILTER WAS REPLACED TO FIX OVERHEAT PROB. I DID NOT CHK OR CHANGE THE CASE DRAIN FILTER DURING THE PUMP CHANGE BECAUSE THE CASE DRAIN AND PRESSURE FILTERS WERE INSPECTED THE PREVIOUS DAY (FOR AN OVERHEAT) AND NO DEBRIS WAS FOUND, INDICATING THE PUMP WAS NOT OVERHEATING DUE TO MECHANICAL FAILURE. IF THE PUMP IS BEING REPLACED FOR OTHER THAN A MECHANICAL FAILURE, THE FILTER DOES NOT HAVE TO BE REPLACED (REF MAINT MANUAL 29-15-22, STEP 2.F.12).
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.