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A B737-300 was dispatched with 1 #2 engine fan blade missing a blade damper resulting in a vibrating engine.
| Attributes | |
| ACN | 429785 |
| Time | |
| Date | 199902 |
| Day | Sat |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Weather Elements | Rain |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : parked ground : maintenance |
| Flight Plan | None |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : airframe technician : powerplant |
| Experience | maintenance technician : 10 |
| ASRS Report | 429785 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : airframe |
| Experience | maintenance lead technician : 5 maintenance technician : 14 |
| ASRS Report | 429750 |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : far non adherence : published procedure other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : engine vibration indication |
| Resolutory Action | other |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : lighting contributing factor : weather performance deficiency : scheduled maintenance performance deficiency : installation performance deficiency : non compliance with legal requirements |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Weather |
| Primary Problem | Maintenance Human Performance |
Narrative:
Removed and reinstalled #1 engine fan blades for accomplishing lube. I was told 2 days later that #1 engine had a vibration problem and that upon removal of the blades to accomplish a second blade lube it was discovered that one of the dampeners was missing. I don't know how this could have happened, as I looked into the cart at least 3 times with my flashlight to make sure all parts were installed and none left out. 2 mechanics accomplished the blade removal and installation. 1 in the inlet and 1 outside. I was the one outside handing parts to the mechanic in the inlet. It was dark and raining hard, maybe I missed something. But I don't think that I did. I believe the corrective action was to install the missing dampener.
Original NASA ASRS Text
Title: A B737-300 WAS DISPATCHED WITH 1 #2 ENG FAN BLADE MISSING A BLADE DAMPER RESULTING IN A VIBRATING ENG.
Narrative: REMOVED AND REINSTALLED #1 ENG FAN BLADES FOR ACCOMPLISHING LUBE. I WAS TOLD 2 DAYS LATER THAT #1 ENG HAD A VIBRATION PROB AND THAT UPON REMOVAL OF THE BLADES TO ACCOMPLISH A SECOND BLADE LUBE IT WAS DISCOVERED THAT ONE OF THE DAMPENERS WAS MISSING. I DON'T KNOW HOW THIS COULD HAVE HAPPENED, AS I LOOKED INTO THE CART AT LEAST 3 TIMES WITH MY FLASHLIGHT TO MAKE SURE ALL PARTS WERE INSTALLED AND NONE LEFT OUT. 2 MECHS ACCOMPLISHED THE BLADE REMOVAL AND INSTALLATION. 1 IN THE INLET AND 1 OUTSIDE. I WAS THE ONE OUTSIDE HANDING PARTS TO THE MECH IN THE INLET. IT WAS DARK AND RAINING HARD, MAYBE I MISSED SOMETHING. BUT I DON'T THINK THAT I DID. I BELIEVE THE CORRECTIVE ACTION WAS TO INSTALL THE MISSING DAMPENER.
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.