Narrative:

I was assigned to work a 'B' check on aircraft X. This task has job cards to work. One job card is to change maintenance aircraft battery. I also worked other assigned jobs on that aircraft. One job was an engineering call-out to change the main aircraft battery. The battery has a dash number. The dash number on the main battery that was currently installed on the aircraft was not the one called out to be replaced according to the engineering call-out. I then called the company's line maintenance division. I explained the problem to the line maintenance controller in charge of B737. After discussion of the problem, he said not to change it. I did not change the battery. I signed off the write-up, stating what I had found out about the difference in the dash numbers. The controller said to put his name in the text, stating that this was ok. I did. I also signed off the 'B' check paper job card. The engineering call-out and the 'B' check call-out are tied together. I also informed my lead and my supervisor of the situation. The next evening when I came to work, I called line maintenance and spoke to the same controller. We both decided the battery should be changed. He assigned it that night to ZZZ line maintenance to have the battery changed. The paperwork led to the confusion. It gives no further instructions or actions if you find the dash number call-out to remove is not present on the aircraft. This is why I called the line maintenance controller for instructions.

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Original NASA ASRS Text

Title: A B737-300 TECHNICIAN WORKING IN A HVY CHK IS GIVEN 2 JOB CARDS -- 1 TO REPLACE THE MAIN SHIP'S BATTERY, AND 1 TO REPLACE THE SAME BATTERY ONLY WITH A PARTICULAR NUMBER. BATTERY WAS NOT REPLACED DUE TO CONFUSION.

Narrative: I WAS ASSIGNED TO WORK A 'B' CHK ON ACFT X. THIS TASK HAS JOB CARDS TO WORK. ONE JOB CARD IS TO CHANGE MAINT ACFT BATTERY. I ALSO WORKED OTHER ASSIGNED JOBS ON THAT ACFT. ONE JOB WAS AN ENGINEERING CALL-OUT TO CHANGE THE MAIN ACFT BATTERY. THE BATTERY HAS A DASH NUMBER. THE DASH NUMBER ON THE MAIN BATTERY THAT WAS CURRENTLY INSTALLED ON THE ACFT WAS NOT THE ONE CALLED OUT TO BE REPLACED ACCORDING TO THE ENGINEERING CALL-OUT. I THEN CALLED THE COMPANY'S LINE MAINT DIVISION. I EXPLAINED THE PROB TO THE LINE MAINT CTLR IN CHARGE OF B737. AFTER DISCUSSION OF THE PROB, HE SAID NOT TO CHANGE IT. I DID NOT CHANGE THE BATTERY. I SIGNED OFF THE WRITE-UP, STATING WHAT I HAD FOUND OUT ABOUT THE DIFFERENCE IN THE DASH NUMBERS. THE CTLR SAID TO PUT HIS NAME IN THE TEXT, STATING THAT THIS WAS OK. I DID. I ALSO SIGNED OFF THE 'B' CHK PAPER JOB CARD. THE ENGINEERING CALL-OUT AND THE 'B' CHK CALL-OUT ARE TIED TOGETHER. I ALSO INFORMED MY LEAD AND MY SUPVR OF THE SIT. THE NEXT EVENING WHEN I CAME TO WORK, I CALLED LINE MAINT AND SPOKE TO THE SAME CTLR. WE BOTH DECIDED THE BATTERY SHOULD BE CHANGED. HE ASSIGNED IT THAT NIGHT TO ZZZ LINE MAINT TO HAVE THE BATTERY CHANGED. THE PAPERWORK LED TO THE CONFUSION. IT GIVES NO FURTHER INSTRUCTIONS OR ACTIONS IF YOU FIND THE DASH NUMBER CALL-OUT TO REMOVE IS NOT PRESENT ON THE ACFT. THIS IS WHY I CALLED THE LINE MAINT CTLR FOR INSTRUCTIONS.

Data retrieved from NASA's ASRS site as of July 2007 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.