Maintenance Airframe; Maintenance Powerplant
Time Pressure; Communication Breakdown; Training / Qualification; Workload; Troubleshooting
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural MEL / CDL; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
MEL; Incorrect / Not Installed / Unavailable Part; Aircraft; Manuals; Staffing; Procedure
Worked on Aircraft X. Aircraft X had previous Class 2 faults on ELAC (Elevator Aileron Computer) 2 that was placed on MEL at a previous station. Per the MIC 77XXXXX; ZZZ requested that ELAC 2 be replaced. I proceeded to replace ELAC 2; printed out aircraft maintenance manual reference and made sure that the part is effective for the aircraft. However; I was unaware that there was supplemental information in the aircraft maintenance manual; stating that software configuration checks need to match for ELAC 1 and 2. I replaced ELAC 2 with the knowledge that it is effective for the aircraft. I am not qualified; so I asked somebody else to perform the Cat 3 configuration test.I think the event occurred because the IPC (Illustrated Parts Catalog) is unclear on the software modification information. Also; the Supplemental information does not pop up when opening the manual for the R/R (Repair and Replace).Provide training for personnel about ELAC software compatibility. Make the information a Warning in RED letters so the individual can read and understand that the software configuration cannot be different between ELAC systems.
Technician reported installing incorrect ELAC due to manuals being unclear about software compatibility.