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A B737-700 was dispatched in non compliance with incorrect tires installed on the nose gear. One a bias ply tire and the other was a radial tire.
| Attributes | |
| ACN | 530645 |
| Time | |
| Date | 200111 |
| Day | Sat |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | ground : parked |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| ASRS Report | 530645 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : airframe technician : powerplant |
| ASRS Report | 530644 |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper documentation non adherence : published procedure non adherence : far |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : manuals contributing factor : schedule pressure performance deficiency : inspection performance deficiency : installation performance deficiency : non compliance with legal requirements |
| Supplementary | |
| Problem Areas | Chart Or Publication Company Aircraft |
| Situations | |
| Publication | mx manual |
Narrative:
Aircraft required nose tires to be changed. Nose tires were changed and aircraft released for revenue service. In ZZZ, first officer on the walkaround noticed a yellow DOT on one tire. (Yellow DOT on tire sidewall denotes radial ply) and no yellow DOT on the other nose tire. A radial ply and bias ply inter-mix had occurred, contract maintenance replaced a tire so both tires matched. Supplemental information from acn 530644: I arrived at the aircraft and proceeded to fill out the logbook for nose tire change. I checked the tags for both tires, part number, XXX and -700 matched. I completed the paperwork and handed the logbook to the first officer. Supplemental information from acn 530646: I assisted on nose tire change on aircraft. There were several mechanics helping out. No one noticed the different type of tires installed. To alleviate the problem in the future, a different part number should be used on radial versus bias ply tires.
Original NASA ASRS Text
Title: A B737-700 WAS DISPATCHED IN NON COMPLIANCE WITH INCORRECT TIRES INSTALLED ON THE NOSE GEAR. ONE A BIAS PLY TIRE AND THE OTHER WAS A RADIAL TIRE.
Narrative: ACFT REQUIRED NOSE TIRES TO BE CHANGED. NOSE TIRES WERE CHANGED AND ACFT RELEASED FOR REVENUE SVC. IN ZZZ, FO ON THE WALKAROUND NOTICED A YELLOW DOT ON ONE TIRE. (YELLOW DOT ON TIRE SIDEWALL DENOTES RADIAL PLY) AND NO YELLOW DOT ON THE OTHER NOSE TIRE. A RADIAL PLY AND BIAS PLY INTER-MIX HAD OCCURRED, CONTRACT MAINT REPLACED A TIRE SO BOTH TIRES MATCHED. SUPPLEMENTAL INFO FROM ACN 530644: I ARRIVED AT THE ACFT AND PROCEEDED TO FILL OUT THE LOGBOOK FOR NOSE TIRE CHANGE. I CHKED THE TAGS FOR BOTH TIRES, PART NUMBER, XXX AND -700 MATCHED. I COMPLETED THE PAPERWORK AND HANDED THE LOGBOOK TO THE FO. SUPPLEMENTAL INFO FROM ACN 530646: I ASSISTED ON NOSE TIRE CHANGE ON ACFT. THERE WERE SEVERAL MECHS HELPING OUT. NO ONE NOTICED THE DIFFERENT TYPE OF TIRES INSTALLED. TO ALLEVIATE THE PROB IN THE FUTURE, A DIFFERENT PART NUMBER SHOULD BE USED ON RADIAL VERSUS BIAS PLY TIRES.
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.