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A B737-300 fuel tank float switch had a union nut omitted during installation. Technician corrected the error. Technician believes previous aircraft worked may have the same error.
| Attributes | |
| ACN | 697904 |
| Time | |
| Date | 200605 |
| 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 | B737-300 |
| 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 | 697904 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : published procedure non adherence : far |
| Independent Detector | other other : 1 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other |
| Factors | |
| Maintenance | performance deficiency : installation performance deficiency : non compliance with legal requirements performance deficiency : scheduled maintenance performance deficiency : logbook entry |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Chart Or Publication Aircraft Environmental Factor |
| Primary Problem | Maintenance Human Performance |
Narrative:
On may/xa/06; I was informed by another mechanic that I had forgotten to install the bulkhead union nut on the #1 float switch tsd of air carrier X. I corrected the problem before the aircraft was returned to service and documented the work performed. It was then that I was concerned that I might have made the same mistake on other aircraft on which I had accomplished the same modification; but was unable to recall the particular aircraft tail numbers.
Original NASA ASRS Text
Title: A B737-300 FUEL TANK FLOAT SWITCH HAD A UNION NUT OMITTED DURING INSTALLATION. TECHNICIAN CORRECTED THE ERROR. TECHNICIAN BELIEVES PREVIOUS ACFT WORKED MAY HAVE THE SAME ERROR.
Narrative: ON MAY/XA/06; I WAS INFORMED BY ANOTHER MECH THAT I HAD FORGOTTEN TO INSTALL THE BULKHEAD UNION NUT ON THE #1 FLOAT SWITCH TSD OF ACR X. I CORRECTED THE PROB BEFORE THE ACFT WAS RETURNED TO SVC AND DOCUMENTED THE WORK PERFORMED. IT WAS THEN THAT I WAS CONCERNED THAT I MIGHT HAVE MADE THE SAME MISTAKE ON OTHER ACFT ON WHICH I HAD ACCOMPLISHED THE SAME MODIFICATION; BUT WAS UNABLE TO RECALL THE PARTICULAR ACFT TAIL NUMBERS.
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.