Commercial Fixed Wing
Maintenance Airframe; Maintenance Powerplant
Communication Breakdown
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Maintenance
General Flight Cancelled / Delayed; General Maintenance Action
Aircraft; Procedure
ZZZ Hangar X; day shift; Aircraft X. Reference ZZZ [Routine Overnight Layover Check Work]. Non-routine for [Logbook Deferral Sheet] XXXXXXX. Working DFDAU (Digital Flight Data Acquisition Unit) fault. Replaced DFDAU IAW (In Accordance With) AMM (Aircraft Maintenance Manual) 31-XX-XX. Installation was complete except for [the] very last step of installation. I wrote a separate item on non-routine XXXXXXX; Item Number 5 on page 2 of 3. I wrote that; per AMM 31-XX-XX-XXX Step F (3); [one] must accomplish verification of aircraft number on the DFDAU initialization page.Is this to be accomplished on the DFDAU computer; or done through the DFDAU page on the MCDU (Multipurpose Control and Display Unit)? The AMM steps were unclear and did not match what we were seeing on the aircraft. At [the] end of shift; I had called [Operations Control] for guidance. They were unsure how to advise us to proceed; and we were waiting to hear back from them. That is why I made sure to write a separate item for it. When I came in the next day; Aircraft X was green and being delivered to the terminal for revenue service. I inquired how the open item was completed because I wanted to know for future reference. After trying to get a solid answer; no one in avionics said they worked it; and Management could not give me an answer either.[The] Maintenance Supervisor was [the] acting Supervisor on [today] and was also in [tomorrow]. I asked him how it had been completed. He told me someone had found an AMM reference that covered it; and he asked an afternoon shift Crew Chief to go look at it. It was at that point I decided to follow up and check the paperwork once it had been entered into AirVault. I was able to see it in AirVault today. That is when I found Item 5 of non-routine XXXXXXX to still be open/not signed for.This should've been caught when non-routine XXXXXXX was audited prior to aircraft release. Better communication between Maintenance and Supervision. Who was responsible for knowing that this issue was still open? The non-routine should not have passed audit.
Technician reported that an open maintenance item was overlooked on audit and the aircraft was delivered to the terminal for revenue service.