Maintenance Airframe; Maintenance Powerplant
Maintenance Technician 27
Other / Unknown; Situational Awareness
Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Human Factors
We were given a service check with some other tasks on the aircraft. We had to change the #1 brake and a nose tire. When we were ready for that; we started gathering all the equipment and Aircraft Maintenance Manual (AMM) and Illustrated Parts Catalogue (IPC) references; and this wrong brake assembly (for aircraft 737-700) was among the others for 737-800; and we happened to pick this wrong one. During this brake change and the other assignments we both failed to double check the part number (p/n) of this brake with our documents on hand. We proceeded with the brake change and since they are very much alike; we never suspected anything wrong. At the time of signing documents; since my partner didn't have a release for the aircraft in work; I signed all documents. The following night; I was informed of the mistake that we made. The brake was replaced at another station with the correct one. I feel very; very sorry for this mistake; it's something that has never happened to me before. I try always to be careful with all work. I'm so sorry for this mistake.
Maintenance Technician is informed after the fact that he and a helper installed a B737-700 brake on a B737-800 and signed it off. The part number was not correct and was detected after the aircraft had been released for flight.