Technician reported aircraft released for service with wrong part installed.

Attributes
ACN	1698425
Time
Date	201910
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	A321
Operating Under FAR Part	Part 121
Flight Phase	Parked
Component
Aircraft Component	RPM/N1/N2/Etc Indication
Person 1
Function	Technician
Qualification	Maintenance Airframe Maintenance Powerplant
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Deviation - Procedural Maintenance

Narrative:

Aircraft X came to ZZZ with a pilot discrepancy for engine 1 EPR mode fault. Found short P/T2 probe installed on engine 1 nose cowl. This part is incorrect for A321. Engine 1 P2/T2 probe was replaced in ZZZ1 by contract employee. Discrepancy was corrected by [company] mechanics in the ZZZ hangar. I was not involved with the repair; but was made aware of the event.event occurred in ZZZ1 by contract maintenance. It was discovered that the incorrect probe was installed when aircraft X arrived in ZZZ. Task card 'remove-install nose cowl' explains the different probe effectivities. The reference material is very hard to follow to understand effectivity. There needs to be a more direct way to verify effectivity on engines.

Original NASA ASRS Text

Title: Technician reported aircraft released for service with wrong part installed.

Narrative: Aircraft X came to ZZZ with a Pilot Discrepancy for Engine 1 EPR Mode Fault. Found short P/T2 probe installed on Engine 1 nose cowl. This part is incorrect for A321. Engine 1 P2/T2 probe was replaced in ZZZ1 by contract Employee. Discrepancy was corrected by [company] mechanics in the ZZZ hangar. I was not involved with the repair; but was made aware of the event.Event occurred in ZZZ1 by contract maintenance. It was discovered that the incorrect probe was installed when Aircraft X arrived in ZZZ. Task Card 'Remove-Install Nose Cowl' explains the different probe effectivities. The reference material is very hard to follow to understand effectivity. There needs to be a more direct way to verify effectivity on engines.

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.