A B737-800 was dispatched in non compliance with the incorrect main ships batteries installed.

Attributes
ACN	561179
Time
Date	200209
Day	Tue
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Light	Night
Aircraft 1
Controlling Facilities	tower : atl.tower
Operator	common carrier : air carrier
Operating Under FAR Part	Part 121
Flight Phase	ground : maintenance
Person 1
Affiliation	company : air carrier
Function	maintenance : lead technician
Qualification	technician : powerplant technician : inspection authority technician : airframe
Experience	maintenance avionics : 1 maintenance lead technician : 3 maintenance supervisor : 3 maintenance technician : 10
ASRS Report	561179
Person 2
Affiliation	company : air carrier
Function	maintenance : technician
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : far non adherence : published procedure
Resolutory Action	none taken : detected after the fact
Consequence	other other
Factors
Maintenance	contributing factor : schedule pressure performance deficiency : inspection performance deficiency : non compliance with legal requirements
Supplementary
Problem Areas	Maintenance Human Performance Aircraft
Primary Problem	Maintenance Human Performance

Narrative:

On sep/tue/02 at XA30, I unintentionally installed the incorrect part number batteries on ship X. I was working with 2 other mechanics. One went to get the batteries. I installed these batteries assuming they were the right ones. They fit perfectly and tested according to the maintenance manual. After leaving work, I was informed of the discrepancy. I admit complacency in not checking the numbers and would never intentionally put the wrong parts on an aircraft.

Original NASA ASRS Text

Title: A B737-800 WAS DISPATCHED IN NON COMPLIANCE WITH THE INCORRECT MAIN SHIPS BATTERIES INSTALLED.

Narrative: ON SEP/TUE/02 AT XA30, I UNINTENTIONALLY INSTALLED THE INCORRECT PART NUMBER BATTERIES ON SHIP X. I WAS WORKING WITH 2 OTHER MECHS. ONE WENT TO GET THE BATTERIES. I INSTALLED THESE BATTERIES ASSUMING THEY WERE THE RIGHT ONES. THEY FIT PERFECTLY AND TESTED ACCORDING TO THE MAINT MANUAL. AFTER LEAVING WORK, I WAS INFORMED OF THE DISCREPANCY. I ADMIT COMPLACENCY IN NOT CHKING THE NUMBERS AND WOULD NEVER INTENTIONALLY PUT THE WRONG PARTS ON AN ACFT.

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.