EMB ERJ 145 ER/LR
Maintenance Powerplant; Maintenance Airframe
Workload; Situational Awareness; Distraction
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Incorrect / Not Installed / Unavailable Part; Aircraft; Human Factors
[I] took turn over from 3rd Shift for a Fuel Pump Module (FPMU) carbon seal change on right-hand engine of an EMB-145 aircraft for oil leaking from carbon seal of FPMU. When I arrived at the right-hand engine noticed; #2 generator sight glass [was] full of oil and noted discrepancy on a non-routine write-up card. Followed procedure for remove and replace of generator carbon seal; then noticed hydraulic pump had evidence of leakage; noted discrepancy on another non-routine write-up card.Was in process of removing and replacing the hydraulic pump and was approached by a Federal Agency Inspector who asked for my paperwork for the removal and replacement of the hydraulic pump. The Inspector asked me if I had pulled the circuit breaker for the removal and replacement of the hydraulic pump. At that time I said I had; was not sure; because I remembered pulling a circuit breaker for the removal and replacement of the Generator but not for the hydraulic pump. Inspector went and looked and when he returned I told him that I hadn't and was in process of going to cockpit to collar proper circuit breaker as required. I did not follow established procedures for the removal and replacement of the hydraulic pump change. When multitasking several remove and replace items; be sure to follow established procedures for each event. Also double-check between each task.
A Line Mechanic reports he did not follow established procedures for the removal and replacement of the right engine hydraulic pump on an EMB-145 aircraft while multi-tasking several remove and replace items. He had failed to collar a Hydraulic Pump Circuit Breaker.