Narrative:

I was asked to supervise and show two mechanics how to properly install a number 8 main landing gear tire on a boeing 767-300 aircraft. I showed the [mechanics] how to properly look up in the aircraft maintenance manual (amm) the procedures and tooling required and read through the amm with them while a tire was being procured by our lead. I assisted the two [mechanics] in the process of removing and replacing the wheel assembly but failed to check the part number of the tire being installed. Having worked international line maintenance before; I am aware of the part number differences between the B767-300 and the B767-300ER tires. I feel that the distraction of training the two students; and assuming the lead amt was providing me with the proper effective tire for the aircraft; distracted me from checking the part effectivity for myself. Then when entering the information into the log I again overlooked the fact that the wrong part number (pn) had been installed onto the aircraft. Though the incorrect tire was provided for me; ultimately I am responsible for the equipment that is being installed and signed for. I supervised and help[ed] perform the maintenance task; and signed off the aircraft maintenance log. I was unaware of my mistake until [about a month later] I was made aware of the discrepancy by the hangar shift manager and my lead; and was informed that the tracking system had logged the error in part effectivity and that I needed to sit and make a statement for the internal investigation into the matter. I brought my error to the attention of the two [mechanics] that I was training and emphasized the importance of checking pn effectivity with the aircraft that is being worked; regardless of who provides the part for them. I also explained that ultimately regardless of the situation; the mechanic performing and signing for the work is responsible for insuring the airworthiness and effectivity of the part being installed on the aircraft.

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Original NASA ASRS Text

Title: During a B767-300ER Service Check an incorrect wheel assembly was installed on the Main Landing Gear. A wheel assembly for a B767-300 non-ER was used.

Narrative: I was asked to supervise and show two mechanics how to properly install a number 8 main landing gear tire on a Boeing 767-300 aircraft. I showed the [mechanics] how to properly look up in the aircraft maintenance manual (AMM) the procedures and tooling required and read through the AMM with them while a tire was being procured by our lead. I assisted the two [mechanics] in the process of removing and replacing the wheel assembly but failed to check the part number of the tire being installed. Having worked international line maintenance before; I am aware of the part number differences between the B767-300 and the B767-300ER tires. I feel that the distraction of training the two students; and assuming the lead AMT was providing me with the proper effective tire for the aircraft; distracted me from checking the part effectivity for myself. Then when entering the information into the log I again overlooked the fact that the wrong Part Number (PN) had been installed onto the aircraft. Though the incorrect tire was provided for me; ultimately I am responsible for the equipment that is being installed and signed for. I supervised and help[ed] perform the maintenance task; and signed off the aircraft maintenance log. I was unaware of my mistake until [about a month later] I was made aware of the discrepancy by the hangar shift manager and my lead; and was informed that the tracking system had logged the error in part effectivity and that I needed to sit and make a statement for the internal investigation into the matter. I brought my error to the attention of the two [mechanics] that I was training and emphasized the importance of checking PN effectivity with the aircraft that is being worked; regardless of who provides the part for them. I also explained that ultimately regardless of the situation; the mechanic performing and signing for the work is responsible for insuring the airworthiness and effectivity of the part being installed on the aircraft.

Data retrieved from NASA's ASRS site 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.