A maintenance technician neglected to fully remove power from the battery charger; resulting in shor...

Narrative:

I was tasked with [working several] aircraft with autothrottle inop; hgs (heads-up guidance system) display inop; L2 window heat inop and engine control light write up along with the other regular task cards. While working on [aircraft X] I accomplished step 1 (battery replacement) and since there was no part sent for the second step; I then went to work on [aircraft Y] with window heat and engine control light issues. Meanwhile got notified that the part for the second step on [aircraft X] (battery charger) had showed up. Went back to the first plane to complete step 2 for battery charger change. During removal missed pulling one of the two circuit breakers both labeled battery charger. The charger cable terminal lug contacted and shorted damaging the contact terminal. Notified lead and supervisor of the issue immediately. Engineering desk was consulted and came to consensus to re-terminate a new contact lug or replace the run for that charger cable. There was a lot of work scheduled for the night. Parts were not all present at beginning of the shift. While working between the aog (aircraft on ground) write ups for aircraft [X and Y] I missed pulling one of the breakers labeled battery charger.

Original NASA ASRS Text

Title: A Maintenance Technician neglected to fully remove power from the battery charger; resulting in shorting of the contact terminal that required replacement.

Narrative: I was tasked with [working several] aircraft with autothrottle inop; hgs (Heads-Up Guidance System) display inop; L2 window heat inop and engine control light write up along with the other regular task cards. While working on [aircraft X] I accomplished step 1 (battery replacement) and since there was no part sent for the second step; I then went to work on [aircraft Y] with window heat and engine control light issues. Meanwhile got notified that the part for the second step on [aircraft X] (battery charger) had showed up. Went back to the first plane to complete step 2 for battery charger change. During removal missed pulling one of the two circuit breakers both labeled battery charger. The charger cable terminal lug contacted and shorted damaging the contact terminal. Notified lead and supervisor of the issue immediately. Engineering desk was consulted and came to consensus to re-terminate a new contact lug or replace the run for that charger cable. There was a lot of work scheduled for the night. Parts were not all present at beginning of the shift. While working between the AOG (Aircraft on Ground) write ups for aircraft [X and Y] I missed pulling one of the breakers labeled battery charger.

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.

Attributes
ACN	1277957
Time
Date	201506
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Night
Aircraft 1
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	Parked
Flight Plan	IFR
Aircraft 2
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	Parked
Component
Aircraft Component	Electrical Wiring & Connectors
Person 1
Function	Technician
Qualification	Maintenance Airframe Maintenance Powerplant
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Maintenance Deviation - Procedural Published Material / Policy

A maintenance technician neglected to fully remove power from the battery charger; resulting in shorting of the contact terminal that required replacement.