Narrative:

Although I did not sign off the non-routine write-up (north/right); I performed most of the installation work on the tire change; including removal of the hub cap; wheel nut and spacer; wheel; and installation of all the same components. Four other mechanics (including our lead technician) were involved in bringing the new tire and equipment; amm references; tagging the cockpit and communicating with the cockpit crew members. The tire we installed was marked for a B737-900 aircraft; but the aircraft needed a heavier rated tire. We mis-identified the tire we installed; not realizing it was not a heavy rated tire. The correct tire was installed at another station by a technician that caught the error. I am personally going back to old maintenance bulletins and amm references and other research forms to avoid making the same mistake. I also will remember to double check part numbers to components I am involved in changing; when working with other co-workers; and not assume regardless of their experience; that they have the correct part. Not excusing our mistake; it was all too easy a mistake to make under the circumstances of a tight schedule and the stenciling on the tires for the heavy's and non-heavy tires could be improved. I remember reading the maintenance bulletin; but it was a while ago and I haven't changed a B737-900 tire in a while.there is too much conflicting information in the technical documents. The noise levels were quite high. Communications between technicians; leads and supervisors could be improved.

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Original NASA ASRS Text

Title: Two Line Mechanics and their Lead report on their involvement installing a lower rated tire at the # 3 Main tire position on a B737-900.

Narrative: Although I did not sign off the Non-Routine Write-up (N/R); I performed most of the installation work on the tire change; including removal of the hub cap; wheel nut and spacer; wheel; and installation of all the same components. Four other Mechanics (including our Lead Technician) were involved in bringing the new tire and equipment; AMM references; tagging the Cockpit and communicating with the cockpit Crew members. The tire we installed was marked for a B737-900 aircraft; but the aircraft needed a heavier rated tire. We mis-identified the tire we installed; not realizing it was not a heavy rated tire. The correct tire was installed at another Station by a Technician that caught the error. I am personally going back to old Maintenance Bulletins and AMM references and other research forms to avoid making the same mistake. I also will remember to double check Part Numbers to Components I am involved in changing; when working with other co-workers; and not assume regardless of their experience; that they have the correct part. Not excusing our mistake; it was all too easy a mistake to make under the circumstances of a tight schedule and the stenciling on the tires for the heavy's and non-heavy tires could be improved. I remember reading the Maintenance Bulletin; but it was a while ago and I haven't changed a B737-900 tire in a while.There is too much conflicting information in the Technical documents. The noise levels were quite high. Communications between Technicians; Leads and Supervisors could be improved.

Data retrieved from NASA's ASRS site as of April 2012 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.