Commercial Fixed Wing
Maintenance Powerplant; Maintenance Airframe
Training / Qualification; Communication Breakdown; Situational Awareness
Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Published Material / Policy
General None Reported / Taken
Human Factors; Procedure
ZZZ Line Maintenance mechanics were assigned Aircraft X. Flight XXXX was delayed. Lead [Mechanic] provided us the information of work. We were to accomplish #1 engine fuel filter replacement. [Lead Mechanic] provided us the engine fuel filter. We never realized that we incorrectly replaced the wrong filter. We removed and replaced the #1 engine fuel filter instead of the APU filter terminating monitor 29-XX-X-XXXX log required.Trusting our Lead; whom supplied us the #1 ENG filter we never checked or identified the correct job assignment that was required to clear the monitor. APU filter was never changed by [either mechanics]. We completed and signed off #1 ENG fuel filter R/R (Remove and Replace) instead.By not following paperwork assignment of replacing APU filter; we mistakenly followed Lead's assignment to change #1 ENG filter.
Aircraft Maintenance Technician reported replacing incorrect aircraft component during maintenance visit.