EMB ERJ 170/175 ER/LR
Maintenance Powerplant; Maintenance Airframe
Time Pressure; Troubleshooting; Workload
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy
Procedure; Manuals; Human Factors; Aircraft
After troubleshooting the aircraft for R/H nav lights being inop; it was determined that the fwd and aft nav lights required replacement. I had grabbed a nav light off of the shelf with assistance from stores people; but inadvertently took the L/H light assy out to the aircraft. I assisted the other mechanic in taking the winglet panel off and then proceeded to replace the aft light assembly while the other mechanic replaced the forward one. After we completed the task; we performed the ops check of the system but no one noticed that the wrong color nav light was installed. We put the aircraft back together and I completed the paperwork in XXXXX. Again; it was not noticed when the paperwork was completed and the part was returned back to stores. We were probably rushing to get the job done and we did not pay attention to detail as much as we should have. A lot of things went wrong to set this up and we should have verified that we had the correct part in the first place to prevent this from happening as well as paying closer attention to the parts tag and ops check. In the future; that is exactly what I will do to keep this from happening again. Also; I signed off the work performed on both the fwd and aft nav lights even though I only replaced the aft nav light. In the future; I will not sign off work that I did not complete all of the work. I was unable to see the forward nav light when we ops checked the lights and therefore should not have taken all the responsibility for the sign off.
Trouble shot the r/h nav light and it ended up being that light. So we then changed the light and figured that the issue was the nav light and it ended up being the wrong color of the light that was installed. I believe the main problem was lack attention to detail; making sure this problem does not happen again I would be more collective and calm while changing this part and making sure it is the right part while ops checking the system.
Technician reported feeling rushed and pressured contributed in him installing an incorrect part on aircraft.