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.
Synopsis
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.
Second reporter narrative
We had a last (minute) tire change on a B737-900 aircraft. The #3 Main tire was changed by a group of Mechanics. In the confusion of the change; we did not notice that we had the wrong tire. I signed-off the tire change without double checking the Part Number. Put in place a practice of having another Mechanic check Parts tag and Part for correct Part Number.
More incidents for this aircraft family →
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.