Narrative:

July 2013; technician Y called the shop office prior to midnight informing me that the aircraft X; a B737-700 aircraft on spot X needed a # 2 tire and a # 2 brake and that he will need assistance in doing the job. As soon as I finished working at my [lead] desk; I got a truck and started gathering tools and equipment to do this tire and brake [change] on aircraft X. I gone in [to stores/parts] loading the aircraft brake into the truck (at the time I thought it was a 737-700 brake instead it was a 737-800/900 brake) and under the impression I loaded the correct brake onto the truck. I went to the aircraft to help technician Y to install a new tire and brake. At the aircraft we installed the tire and brake.I helped technician Y in putting the paperwork for the tire and brake into the [maintenance/parts] computer. The computer came up with a 'force part change' for the brake; I continued with the 'force part change'; thinking that the serial number (south/north) on the removed brake was in error; (south/north on the removed brake was hard to read). When I came into work and found out what had happened; I looked into the # 2 brake on aircraft X and it was changed at another station.

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Original NASA ASRS Text

Title: A Lead Mechanic and another Mechanic report they inadvertently installed a B737-800/900 Brake Assembly on a B737-700 aircraft. Lead Mechanic had overrode the Maintenance /Parts computer by 'forcing' computer system to accept the incorrect brake Part Number (P/N) and Serial Number (S/N) installation.

Narrative: July 2013; Technician Y called the Shop office prior to midnight informing me that the Aircraft X; a B737-700 aircraft on Spot X needed a # 2 tire and a # 2 brake and that he will need assistance in doing the job. As soon as I finished working at my [Lead] desk; I got a truck and started gathering tools and equipment to do this tire and brake [change] on Aircraft X. I gone in [to Stores/Parts] loading the aircraft brake into the truck (at the time I thought it was a 737-700 brake instead it was a 737-800/900 brake) and under the impression I loaded the correct brake onto the truck. I went to the aircraft to help Technician Y to install a new tire and brake. At the aircraft we installed the tire and brake.I helped Technician Y in putting the paperwork for the tire and brake into the [Maintenance/Parts] computer. The computer came up with a 'Force part change' for the brake; I continued with the 'Force part change'; thinking that the Serial Number (S/N) on the removed brake was in error; (S/N on the removed brake was hard to read). When I came into work and found out what had happened; I looked into the # 2 brake on Aircraft X and it was changed at another station.

Data retrieved from NASA's ASRS site as of July 2013 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.