Narrative:

Informed by phone that an APU battery charger that I installed on a crj-900; was not effective to the aircraft; and (that) I used the wrong maintenance reference. The event happened june 2009. Maintenance control called out the crj-900 APU battery charger caution message. This was in the middle of a very busy push. I went to the aircraft and climb in the aft equipment bay; to see what codes I had on the APU battery charger. The codes were aircraft bus failed and shut down. I went back to the shop to get an APU battery charger and APU battery. When I got back to the shop all the computers were being used. I then asked if someone knew the part number of an APU battery charger for a 900. Someone replied yes; and gave me part number. I went back to parts room to get the battery charger. I then verified the part number that was given to me and compared it to the tag. I removed the old charger and compared it with new charger to make sure I still had the correct charger. The chargers were identical twins. The cannon plug were keyed the same. The bolt pattern was the same. I then installed the APU battery charger and cattery. I then performed all operational checks and self test of the charger. The charger was working properly and no more codes were found. When I exited the aft equipment bay; the aircraft was loaded with passengers and was ready to go. Because of this; I did not want to take a maintenance delay. I then called the shop for a reference for the charger and battery. Someone replied on the radio with the reference and I wrote it down in the logbook. I then returned to the shop to complete the paperwork in our maintenance tracking system. I realized while doing this report and replaying the events in my head; where I had made some serious mistakes. The first mistake; I should of let the aircraft take the maintenance delay. By doing so I would not have been in a hurry. The second mistake was; I should have looked up the part in the illustrated parts catalog (ipc) myself; instead of relying on someone else's notes or memory. The third mistake; I should not have compared the charger with themselves. The reason being the charger being remove might be the wrong part number installed. The fourth mistake; I should of looked up the reference myself; instead of relying on someone else's notes or memory. The reason I did not mention the name of the person who gave the part number and the reference is because ultimate responsibility falls on me.

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Original NASA ASRS Text

Title: A Line Mechanic reports he replaced an APU battery and charger that were later found to be 'not' effective for a CRJ-900. Both batteries and battery chargers were identical and passed all operational checks and self-tests.

Narrative: Informed by phone that an APU Battery Charger that I installed on a CRJ-900; was not effective to the aircraft; and (that) I used the wrong maintenance reference. The event happened June 2009. Maintenance Control called out the CRJ-900 APU battery charger caution message. This was in the middle of a very busy push. I went to the aircraft and climb in the aft equipment bay; to see what codes I had on the APU battery charger. The codes were aircraft bus failed and shut down. I went back to the shop to get an APU battery charger and APU battery. When I got back to the shop all the computers were being used. I then asked if someone knew the part number of an APU battery charger for a 900. Someone replied yes; and gave me part number. I went back to parts room to get the battery charger. I then verified the part number that was given to me and compared it to the tag. I removed the old charger and compared it with new charger to make sure I still had the correct charger. The chargers were identical twins. The cannon plug were keyed the same. The bolt pattern was the same. I then installed the APU battery charger and cattery. I then performed all operational checks and self test of the charger. The charger was working properly and no more codes were found. When I exited the aft equipment bay; the aircraft was loaded with passengers and was ready to go. Because of this; I did not want to take a Maintenance delay. I then called the Shop for a reference for the charger and battery. Someone replied on the radio with the reference and I wrote it down in the Logbook. I then returned to the Shop to complete the paperwork in our maintenance tracking system. I realized while doing this report and replaying the events in my head; where I had made some serious mistakes. The first mistake; I should of let the aircraft take the Maintenance delay. By doing so I would not have been in a hurry. The second mistake was; I should have looked up the part in the illustrated parts catalog (IPC) myself; instead of relying on someone else's notes or memory. The third mistake; I should not have compared the charger with themselves. The reason being the Charger being remove might be the wrong part number installed. The fourth mistake; I should of looked up the reference myself; instead of relying on someone else's notes or memory. The reason I did not mention the name of the person who gave the part number and the reference is because ultimate responsibility falls on me.

Data retrieved from NASA's ASRS site as of April 2012 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.