EMB ERJ 170/175 ER/LR
Maintenance Airframe; Maintenance Powerplant
Communication Breakdown; Troubleshooting
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural MEL / CDL
Procedure; MEL; Human Factors; Aircraft
I was told to go to the gate at ZZZ airport to inspect a write up on an ERJ175. The write up stated that the pilots were not able to get cool air in the cockpit during cruise; but the packs worked and blew cool air on ground. It was written up previously and was a repeat write up. Because this was a repeat and there were no EICAS (Engine Indication and Crew Alerting System) messages reported; I decided to interrogate the CMC (Central Maintenance Computer) for active faults and faults stored on the previous flight. I found two fault codes on the current leg as active with no inactive time stamp showing it was resolved. I then went to active faults and both codes were stored as active there as well. The two fault codes were 21000020AM2 and 21000030AM2. Following the FIM (Fault Isolation Manual); the problem was a fault with SPDA (Secondary Power Distribution Assembly) 2 Module 26. I inspected the MEL (Minimum Equipment List) list and there was no deferral for this item. I informed my lead and ordered parts needed for repair. The parts would not arrive until the next morning so I was told it would be days. Shortly after arriving at work; I was informed that it was signed off as left pack deferred and flew out. Looking at the fault codes; the fault was for more than just the pack system which made it non-deferrable.Days did not follow the turn over stating that the faults were active and that the problem was with the SPDA 2 Module 26. They also did not look up fault in FIM and followed the procedures. This allowed for a broken plane to have a different part to be deferred while the actual problem was not addressed. Mechanics need to follow manuals and carefully read shift turnover.
Aircraft Technician reports that an incorrect aircraft part was deferred per Minimum Equipment List.