Date: 201303
Local time of day: 0601-1200
Location: ZZZ.Airport, US
Light: Daylight
Aircraft: B777-200
Operator: Air Carrier
Operating under: Part 121
Mission: Passenger
Flight phase: Parked
Aircraft component: Escape Slide
Reporter organization: Air Carrier
Reporter function: Technician
Reporter qualification: Maintenance Airframe; Maintenance Avionics; Maintenance Powerplant
Human factors: Communication Breakdown; Confusion; Situational Awareness; Training / Qualification; Troubleshooting
Anomaly: Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
Detector: Person Maintenance
When detected: In-flight
Result: General Maintenance Action
Contributing factors: Manuals; Aircraft; Human Factors
Primary problem: Human Factors

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.

Callback: Reporter stated that after he notified Maintenance Control that he had missed the EPAS Amber Light Test for Door 3-Right (R-3); the subsequent check of the slide by a downline Station also revealed that a company requirement to have an Inspector verify that two lockout safety pins had been removed from the door slide and re-installed in a pocket on the slide pack had not been accomplished. That procedure and information was supposed to have been included in their logbook sign-off by an Inspector after a slide replacement; but was not. The safety pins however; were properly stowed in the pocket. Reporter also stated that as a result of the missing RII Inspection sign-off for the lockout pins in the logbook he signed; Maintenance Control did a review of other aircraft logbook sign-offs and found similar missing documentation. He was also asked if he felt pressured to get the aircraft out and he answered 'yes'. He suggested a revision to the Aircraft Maintenance Manual (AMM) to include a notice alerting mechanics to the Amber Light Test of the EPAS Battery pack that still needed to be accomplished; further down in the maintenance procedure for the door.



Synopsis: 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.