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A B737-300 was dispatched in non compliance with an incorrect main gear wheel inner bearing installed resulting in bearing failure.
| Attributes | |
| ACN | 458335 |
| Time | |
| Date | 199912 |
| 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 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance ground : parked |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : airframe |
| Experience | maintenance technician : 11 |
| ASRS Report | 458335 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : airframe technician : powerplant |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : far non adherence : published procedure |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : inspection performance deficiency : repair |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Aircraft |
| Primary Problem | Maintenance Human Performance |
Narrative:
The situation is that a B737 main wheel assembly had a bearing failure. The problem has been determined to be that an incorrect inner bearing was installed. The proper bearing for a B737 inner is a #xyz. The bearing found with the wheel was a #XXX. The 2 bearings are very similar in size, weight and dimension. I believe what caused this was that the wrong bearing was grabbed during the wheel's buildup.
Original NASA ASRS Text
Title: A B737-300 WAS DISPATCHED IN NON COMPLIANCE WITH AN INCORRECT MAIN GEAR WHEEL INNER BEARING INSTALLED RESULTING IN BEARING FAILURE.
Narrative: THE SIT IS THAT A B737 MAIN WHEEL ASSEMBLY HAD A BEARING FAILURE. THE PROB HAS BEEN DETERMINED TO BE THAT AN INCORRECT INNER BEARING WAS INSTALLED. THE PROPER BEARING FOR A B737 INNER IS A #XYZ. THE BEARING FOUND WITH THE WHEEL WAS A #XXX. THE 2 BEARINGS ARE VERY SIMILAR IN SIZE, WT AND DIMENSION. I BELIEVE WHAT CAUSED THIS WAS THAT THE WRONG BEARING WAS GRABBED DURING THE WHEEL'S BUILDUP.
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.