A B757-200 was dispatched in non compliance with the incorrect APU battery installed.

Attributes
ACN	587416
Time
Date	200307
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : pct.tracon
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	ground : maintenance ground : preflight ground : parked
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
Qualification	technician : powerplant technician : airframe
Experience	maintenance technician : 5
ASRS Report	587416
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : far non adherence : published procedure non adherence : company policies
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	performance deficiency : installation performance deficiency : inspection performance deficiency : fault isolation performance deficiency : testing performance deficiency : logbook entry performance deficiency : non compliance with legal requirements
Supplementary
Problem Areas	Chart Or Publication Maintenance Human Performance Aircraft
Primary Problem	Maintenance Human Performance

Narrative:

Aircraft came to the gate with the APU not starting. I troubleshot system per the fim (fault isolation manual) and found battery to have low voltage. I ordered the correct battery for the aircraft from our line stock parts supplier. Parts were delivered to aircraft. I installed parts on aircraft. The next day I found that I installed the incorrect battery on the aircraft. The batter I installed on the aircraft tested and operated properly, also the battery was identical to the battery I removed. The correct battery was installed the day after I installed the wrong one.

Original NASA ASRS Text

Title: A B757-200 WAS DISPATCHED IN NON COMPLIANCE WITH THE INCORRECT APU BATTERY INSTALLED.

Narrative: ACFT CAME TO THE GATE WITH THE APU NOT STARTING. I TROUBLESHOT SYS PER THE FIM (FAULT ISOLATION MANUAL) AND FOUND BATTERY TO HAVE LOW VOLTAGE. I ORDERED THE CORRECT BATTERY FOR THE ACFT FROM OUR LINE STOCK PARTS SUPPLIER. PARTS WERE DELIVERED TO ACFT. I INSTALLED PARTS ON ACFT. THE NEXT DAY I FOUND THAT I INSTALLED THE INCORRECT BATTERY ON THE ACFT. THE BATTER I INSTALLED ON THE ACFT TESTED AND OPERATED PROPERLY, ALSO THE BATTERY WAS IDENTICAL TO THE BATTERY I REMOVED. THE CORRECT BATTERY WAS INSTALLED THE DAY AFTER I INSTALLED THE WRONG ONE.

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.