A320 Maintenance Technician reported that the incorrect part was listed in the Illustrated Parts Catalog (IPC) and needs to be corrected and updated. The installation of the incorrect part as instructed in the current IPC could lead to possible malfunction of the aircraft's thrust reverser system.

Narrative

Report subject - Left C-Duct Thrust Reverser Harness. Reason for report. To correct and update IPC (Illustrated Parts Catalog) parts lists; assembly instructions; and associated illustrations. Prevent wrong part number installation and possible malfunction of associated wiring and aircraft thrust reverser system. Engineering request to revise the associated work order has been made and corrections have been agreed to and process to revise has been initiated.Primary issue is for the backshell on Connector 905P. The harness installation requires a 90-degree backshell for Connector 905P per IPC. The 90-degree backshell provides less bend radius for the wire versus a straight backshell which would make it susceptible to higher stress and possible malfunction of the wire. Associated parts lists and illustrations show a straight backshell but should reflect a 90-degree backshell on all IPCs and illustrations.Connector 905P connects to the left thrust reverser stow and lock proximity sensor. This is a critical indication for the flight crew. Suggested resolution - work with Airbus; Company A; Company B to correct and update IPC parts lists; assembly instructions; and associated illustrations.Report subject - Right C-Duct Thrust Reverser Harness. Reason for report - to correct and update IPC (Illustrated Parts Catalog) parts lists; assembly instructions; and associated illustrations. Prevent wrong part number installation and possible malfunction of associated wiring and aircraft thrust reverser system. Engineering request to revise the associated work order has been made and corrections have been agreed to and process to revise has been initiated.Primary issue is for the backshell on Connector 904P. The harness installation requires a 45-degree backshell for Connector 904P per IPC. The 45-degree backshell provides less bend radius for the wire versus a straight or 90-degree backshell; which would make it susceptible to higher stress and possible malfunction of the wire. Associated parts lists and illustrations show a straight or 90-degree but should reflect a 45-degree backshell on all IPCs and illustrations.Connector 904P connects to the right thrust reverser stow and lock proximity sensor and is a critical indication for the flight crew. Suggested resolution - work with Airbus; Company A; Company B to correct and update IPC parts lists; assembly instructions; and associated illustrations.