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Airline repair shop installed the wrong wheel bearings on 4 wheels of a B767-300 resulting in the wheels being returned to the repair shop due to not fitting when attempted to be installed on the aircraft. This was caused by the installation of the wrong similar looking bearings, but with different part numbers. Mechanic had 10 yrs of technician experience. Was experienced.
| Attributes | |
| ACN | 351356 |
| Time | |
| Date | 199609 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz |
| State Reference | US |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B767-300 and 300 ER |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | other personnel other |
| Qualification | other other : other |
| ASRS Report | 351356 |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | other other : unspecified |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | other |
Narrative:
On oct/xx/96 we received 2 B767-300 er tires back to the air carrier X maintenance shop because they would not fit on the airplane. On further review I noticed that the wrong bearings were installed on the outboard wheel halves. I then looked at the date these tires were built up (sep/96). Going through our records we built up 4 B767- 300 main wheels that day. I then sent notification to the stations we supply with this tire and informed them to look for the remaining 2 tires, supplying them with the serial numbers and date built, and have them return the tires to ord shop. Contributing factor: the wrong bearing that was installed #522-546 and the bearing that is correct #522-549 are both very similar in size and number. Corrective action: ultimately, it is the mechanic's responsibility to check all the numbers on each bearing for correctness.
Original NASA ASRS Text
Title: AIRLINE REPAIR SHOP INSTALLED THE WRONG WHEEL BEARINGS ON 4 WHEELS OF A B767-300 RESULTING IN THE WHEELS BEING RETURNED TO THE REPAIR SHOP DUE TO NOT FITTING WHEN ATTEMPTED TO BE INSTALLED ON THE ACFT. THIS WAS CAUSED BY THE INSTALLATION OF THE WRONG SIMILAR LOOKING BEARINGS, BUT WITH DIFFERENT PART NUMBERS. MECH HAD 10 YRS OF TECHNICIAN EXPERIENCE. WAS EXPERIENCED.
Narrative: ON OCT/XX/96 WE RECEIVED 2 B767-300 ER TIRES BACK TO THE ACR X MAINT SHOP BECAUSE THEY WOULD NOT FIT ON THE AIRPLANE. ON FURTHER REVIEW I NOTICED THAT THE WRONG BEARINGS WERE INSTALLED ON THE OUTBOARD WHEEL HALVES. I THEN LOOKED AT THE DATE THESE TIRES WERE BUILT UP (SEP/96). GOING THROUGH OUR RECORDS WE BUILT UP 4 B767- 300 MAIN WHEELS THAT DAY. I THEN SENT NOTIFICATION TO THE STATIONS WE SUPPLY WITH THIS TIRE AND INFORMED THEM TO LOOK FOR THE REMAINING 2 TIRES, SUPPLYING THEM WITH THE SERIAL NUMBERS AND DATE BUILT, AND HAVE THEM RETURN THE TIRES TO ORD SHOP. CONTRIBUTING FACTOR: THE WRONG BEARING THAT WAS INSTALLED #522-546 AND THE BEARING THAT IS CORRECT #522-549 ARE BOTH VERY SIMILAR IN SIZE AND NUMBER. CORRECTIVE ACTION: ULTIMATELY, IT IS THE MECH'S RESPONSIBILITY TO CHK ALL THE NUMBERS ON EACH BEARING FOR CORRECTNESS.
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.