Narrative:

I was made aware that on date on aircraft X that 3 hazmat parts (batteries) were left in the galley area on the plane. I was assigned to the interior area on an A2 check. Whiie was accomplishing job card; step 1 is 'operational check of the electronic circuit of inflatable restraint'. This check failed at all seats on card (row 5lh; 5rh and seat 10f). I ordered said batteries for 3 rows. My lead ordered 7 inflatable airbag seat belts/harnesses. I never used any of these parts but they were scattered around near where I was working. I reseated electrical connections at seats and they all passed the test. Step on job card was done. There were other mechanics also assigned to the interior. They started cleaning up the parts that were ordered. I did a walkthrough of the cabin when I was done and didn't see any parts anywhere. I assumed all parts were off the airplane and returned to stores.I had assumed that the other mechanics had returned parts to storescommunication with other mechanics.

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Original NASA ASRS Text

Title: Airline Mechanic reported being notified Hazmat parts he was working were left on board after he departed.

Narrative: I was made aware that on date on Aircraft X that 3 hazmat parts (batteries) were left in the galley area on the plane. I was assigned to the interior area on an A2 check. WhiIe was accomplishing job card; step 1 is 'operational check of the electronic circuit of inflatable restraint'. This check failed at all seats on card (row 5lh; 5rh and seat 10f). I ordered said batteries for 3 rows. My lead ordered 7 inflatable airbag seat belts/harnesses. I never used any of these parts but they were scattered around near where I was working. I reseated electrical connections at seats and they all passed the test. Step on job card was done. There were other mechanics also assigned to the interior. They started cleaning up the parts that were ordered. I did a walkthrough of the cabin when I was done and didn't see any parts anywhere. I assumed all parts were off the airplane and returned to stores.I had assumed that the other mechanics had returned parts to storesCommunication with other mechanics.

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.