Narrative:

I was assigned to work on a B777-200 aircraft at the hangar to accomplish an a-check. The routine checks were progressing without incident; until I started a check of the aircraft door emergency power assist system (epas) battery packs. I was checking for battery expiration and condition when I found the battery pack for door-3Right (R-3) had expired january 2013. I had never worked on this particular B777 system before. I started replacement of the door batteries (two each) with the current copy of the aircraft maintenance manual (amm). I also utilized the wisdom of several experienced mechanics. I replaced the batteries; and started operational testing of the battery pack. The test failed with the new batteries surprisingly; as I knew the batteries were tested with a meter prior to installation. I took the batteries out of the battery pack; cleaned the contacts on the batteries and the battery pack. I reinstalled the batteries and started operational testing of the battery pack again but the test failed. I was starting to become very anxious as my shift was going to end in two hours and my leaders were expecting a timely completion. I desperately tried to reach out to the experienced mechanics but they had no wisdom to give. I did not understand what had occurred as the battery pack operated normally prior to battery replacement. I was starting to feel panic setting in as my knowledge base had evaporated. I took a leap of faith and ordered a replacement battery pack from my local stores clerk. The [maintenance] leads were getting ready to go home and I knew it was nearly xa:00am. The replacement battery pack had arrived from store's; so I quickly installed the battery pack and batteries. I initiated the operational test and the green self-test light was blinking. The test had passed and the dayshift crew was reporting to the airplane for duty. In the confusion of the moment I signed the logbook as 'test normal' with the dayshift crew signing-off the door panel installation after they installed the door panel.due to my inexperience with this project I assumed the job was complete; as did the experienced mechanics. At the completion of my shift; I felt comfortable with my logbook sign-off. When I came back to work that same day or actually evening; I retrieved a copy of the maintenance manual (M/M) I had that morning. I read through it three or four times and realized I had overlooked the amber light test of the battery pack. I consulted my lead and he suggested I call maintenance control. I spoke to maintenance controller X; who suggested I complete a NASA ASRS form. Controller X also told me he would issue a maintenance control order to complete the test on door 3-Right during the aircraft over nighting. I know that I cannot unring the bell; but I learned from the experience.

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Original NASA ASRS Text

Title: An Aircraft Maintenance Technician (AMT) returns to work and realizes he had not accomplished an Amber Light Test procedure when he signed-off a logbook for replacement of an Emergency Power Assist System (EPAS) Battery pack for Door 3-Right (R-3) slide pack. An RII Inspection verifying the Slide Lockout Safety pins had been properly stowed on the B777-200 aircraft; was also missed.

Narrative: I was assigned to work on a B777-200 aircraft at the hangar to accomplish an A-Check. The Routine Checks were progressing without incident; until I started a check of the aircraft Door Emergency Power Assist System (EPAS) Battery packs. I was checking for battery expiration and condition when I found the battery pack for Door-3Right (R-3) had expired January 2013. I had never worked on this particular B777 System before. I started replacement of the door batteries (two each) with the current copy of the Aircraft Maintenance Manual (AMM). I also utilized the wisdom of several experienced mechanics. I replaced the batteries; and started Operational Testing of the battery pack. The Test failed with the new batteries surprisingly; as I knew the batteries were tested with a meter prior to installation. I took the batteries out of the battery pack; cleaned the contacts on the batteries and the battery pack. I reinstalled the batteries and started Operational Testing of the battery pack again but the Test failed. I was starting to become very anxious as my shift was going to end in two hours and my leaders were expecting a timely completion. I desperately tried to reach out to the experienced mechanics but they had no wisdom to give. I did not understand what had occurred as the battery pack operated normally prior to battery replacement. I was starting to feel panic setting in as my knowledge base had evaporated. I took a leap of faith and ordered a replacement battery pack from my local Stores Clerk. The [Maintenance] Leads were getting ready to go home and I knew it was nearly XA:00am. The replacement battery pack had arrived from Store's; so I quickly installed the battery pack and batteries. I initiated the Operational Test and the Green Self-Test light was blinking. The Test had passed and the Dayshift crew was reporting to the airplane for duty. In the confusion of the moment I signed the logbook as 'Test normal' with the Dayshift crew signing-off the door panel installation after they installed the door panel.Due to my inexperience with this project I assumed the job was complete; as did the experienced mechanics. At the completion of my shift; I felt comfortable with my logbook sign-off. When I came back to work that same day or actually evening; I retrieved a copy of the Maintenance Manual (M/M) I had that morning. I read through it three or four times and realized I had overlooked the Amber Light Test of the battery pack. I consulted my Lead and he suggested I call Maintenance Control. I spoke to Maintenance Controller X; who suggested I complete a NASA ASRS form. Controller X also told me he would issue a Maintenance Control order to complete the Test on Door 3-Right during the aircraft over nighting. I know that I cannot unring the bell; but I learned from the experience.

Data retrieved from NASA's ASRS site as of July 2013 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.