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A B737-500 left engine N2 tachometer was troubleshot and repaired with no paperwork or non routine card written to record the work accomplished.
| Attributes | |
| ACN | 669008 |
| Time | |
| Date | 200508 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-500 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| ASRS Report | 669008 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : lead technician |
| ASRS Report | 670489 |
| Events | |
| Anomaly | aircraft equipment problem : less severe maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : far non adherence : company policies non adherence : published procedure |
| Independent Detector | other other : 3 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : logbook entry performance deficiency : non compliance with legal requirements |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Chart Or Publication |
| Primary Problem | Maintenance Human Performance |
Narrative:
At XA00; was dispatched to the line to pick up aircraft and check in due to a fluctuating N2 indication on #1 engine. We brought the aircraft to the hangar. We proceeded to carry on with the troubleshooting. In the process I slid the 2 center instrument panels aft to gain access to the connector and wiring. We megged out the wiring from the pylon to the N2 tachometer indicator shaking all the wiring looking for a short; which requires removing the N2 tachometer indicator. All items were reinstalled by me. I did not know I had done any wrong until monday morning when maintenance called me and told me there was a fact finding meeting and what it was about. In retrospect; I should have written up the indicator and instrument panels to remind myself they need checked on reinstallation or in case I had to turn over to someone else.
Original NASA ASRS Text
Title: A B737-500 L ENG N2 TACHOMETER WAS TROUBLESHOT AND REPAIRED WITH NO PAPERWORK OR NON ROUTINE CARD WRITTEN TO RECORD THE WORK ACCOMPLISHED.
Narrative: AT XA00; WAS DISPATCHED TO THE LINE TO PICK UP ACFT AND CHK IN DUE TO A FLUCTUATING N2 INDICATION ON #1 ENG. WE BROUGHT THE ACFT TO THE HANGAR. WE PROCEEDED TO CARRY ON WITH THE TROUBLESHOOTING. IN THE PROCESS I SLID THE 2 CTR INST PANELS AFT TO GAIN ACCESS TO THE CONNECTOR AND WIRING. WE MEGGED OUT THE WIRING FROM THE PYLON TO THE N2 TACHOMETER INDICATOR SHAKING ALL THE WIRING LOOKING FOR A SHORT; WHICH REQUIRES REMOVING THE N2 TACHOMETER INDICATOR. ALL ITEMS WERE REINSTALLED BY ME. I DID NOT KNOW I HAD DONE ANY WRONG UNTIL MONDAY MORNING WHEN MAINT CALLED ME AND TOLD ME THERE WAS A FACT FINDING MEETING AND WHAT IT WAS ABOUT. IN RETROSPECT; I SHOULD HAVE WRITTEN UP THE INDICATOR AND INST PANELS TO REMIND MYSELF THEY NEED CHKED ON REINSTALLATION OR IN CASE I HAD TO TURN OVER TO SOMEONE ELSE.
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.