Narrative:

It was brought to my attention by my base manager; that I installed the wrong part number for an right/H medium large transport piston axle change on [the] aircraft. I received the call from the lead mechanic for the strut around the morning within the first couple hours of the shift with my riding partner. We were told that the aircraft that needed an right/H medium large transport strut piston axle change due to a scratch in the chrome that was out of limits.when we arrived at the hangar; there were 2 other mechanics from the night shift that had already started taking the strut apart and they agreed to stay to help until XA00. All the parts had already been ordered by the previous shift to do the job and were already at the aircraft. We gathered all the parts and inventoried them before we started. We matched everything up to all the ipc (illustrated parts catalog) and amm (aircraft maintenance manual) task. Both myself and my partner were both experienced with medium large transport strut seal changes; but it was our first experience the piston axle change. We assembled the strut and serviced it. We finished up with the hands on maintenance about XD00; everything was done except the operations checks which we turned over to the 2nd shift mechanics. We completed the clean-up and updated all the paperwork up to the operations check task.I was told the records department caught the error during data entry. I believe that the cause could be partly due to inexperience with the task at hand; being it was the first time that myself and the other mechanics had had a piston axle change. The ipc was also bit cluttered with many part numbers to match correct effective parts together and that could be why I made this error.after this error was caught; the aircraft was removed from service and the strut piston was changed to the correct effective part. At the time; I was unaware of the reference instruction letter and service information letter for the struts effectivity made it easier to see. I think there should be a page generated with a hyper link to the reference instruction letter #XXXX rev B and service information letter: sil 02121-xx-xx xx; so that this mistake is not repeated in the future.

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Original NASA ASRS Text

Title: CRJ-700 Technician reported installing wrong main landing gear piston and axle assembly on aircraft.

Narrative: It was brought to my attention by my Base Manager; that I installed the wrong part number for an R/H MLG piston axle change on [the] aircraft. I received the call from the Lead Mechanic for the strut around the morning within the first couple hours of the shift with my riding partner. We were told that the aircraft that needed an R/H MLG strut piston axle change due to a scratch in the chrome that was out of limits.When we arrived at the hangar; there were 2 other mechanics from the night shift that had already started taking the strut apart and they agreed to stay to help until XA00. All the parts had already been ordered by the previous shift to do the job and were already at the aircraft. We gathered all the parts and inventoried them before we started. We matched everything up to all the IPC (Illustrated Parts Catalog) and AMM (Aircraft Maintenance Manual) task. Both myself and my partner were both experienced with MLG strut seal changes; but it was our first experience the piston axle change. We assembled the strut and serviced it. We finished up with the hands on maintenance about XD00; everything was done except the operations checks which we turned over to the 2nd shift mechanics. We completed the clean-up and updated all the paperwork up to the operations check task.I was told the Records Department caught the error during data entry. I believe that the cause could be partly due to inexperience with the task at hand; being it was the first time that myself and the other mechanics had had a piston axle change. The IPC was also bit cluttered with many part numbers to match correct effective parts together and that could be why I made this error.After this error was caught; the aircraft was removed from service and the strut piston was changed to the correct effective part. At the time; I was unaware of the Reference Instruction Letter and Service Information Letter for the struts effectivity made it easier to see. I think there should be a page generated with a hyper link to the Reference Instruction Letter #XXXX Rev B and Service Information Letter: SIL 02121-XX-XX XX; so that this mistake is not repeated in the future.

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.