A320
Maintenance Airframe; Maintenance Powerplant
Confusion; Communication Breakdown; Situational Awareness
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Human Factors; Manuals; Aircraft
A borrowed part from Aircraft X; an A320 aircraft; [with] Part Number (P/N) -E01 for Base Contactor and a Three-Pole Contactor P/N -Y1 was installed on Aircraft Y; also an A320 that had Base Contactor P/N -00 and Three Pole Contactor P/N -Y00 removed. The installed parts have a different aircraft 'Effectivity'. The Base Contactor installed on Aircraft Y; from Aircraft X; did not have an index pin [but was able to be] installed on Aircraft Y with no problem. The [Base Contactor] P/N -Y00 removed from Aircraft Y; has an index pin and is not installable on Aircraft X. The Illustrated Parts Catalog (IPC) 29-24-08 Item # 105; shows that the [Base Contactor] P/N -Y00 may be used as a spare part on Aircraft X; but [Base Contactor] P/N -E01 does not show that the part is a spare on Aircraft Y. Both aircraft have the same [Airbus] Functional Item Number (FIN) number XXX-5GX for the parts. When trying to install P/N -Y00 Base Contactor on Aircraft X; the part was not installable because an index hole is not present in the mounting box 107vu126 [panel] for the Yellow Hydraulic Power Contactor. [Non] ETOPS.
An Aircraft Maintenance Technician (AMT) reports about the different aircraft 'Effectivity' of two Base Contactors used for the Yellow Hydraulic System Power contactor on A320 aircraft. The Illustrated Parts Catalog (IPC) did not identify that one contactor had an index pin and required an index hole in order to be installed.