Narrative:

I was working several items on aircraft X. I had the maintenance manual technical service manual on my person as I was working this gripe. Item was an inbound log. Additionally; there was an emergency exit light problem that swing shift had encountered on the overnight check. There was also a flight deck door deferred I was working also. Due to the specific nature of the gripes; working time on this aircraft took me a good portion of my night. Just as I was finishing wrapping up this aircraft; a fellow called me on the radio to come assist him at another location at the terminal with opening a radome on a different airbus. At that moment I was just doublechecking/re-reading the maintenance manual for the replacement of the pfd and I was at mid-page 407. Due to this moment; I was sure in my mind that I had satisfied the maintenance manual. I finished up reviewing the noted maintenance manual. However; due to my 'human factor;' I missed the note that a CAT III check was required when replacing a navigation display or pfd; which was on the second to last page (the page I was on when the call on my radio came in). The last sheet of the maintenance manual is the standard airbus 'close up' (5 lines of text of which 3 lines are titles) which I reviewed quickly before leaving the flight deck. I would also like to note that this particular night in january was the first night the mechanic layoffs took effect. Thus; we had 7 overnight aircraft at the terminal with much work and there was just myself; my fellow. I feel that was another contributing factor. As a footnote; we had been asked by management to try to get as much 'east' stuff accomplished as we could do; but make sure we had the planes on the first bank ready. Additionally; one of the airbuses at the hangar was going out of service; so the station midnight controller asked if they could use aircraft X for a trip; almost at about the same time I got the call for help from the other. I was not tired that night. I had good sleep prior to starting my shift. This issue came to light today (jan/09) as we started the shift because another pfd issue was on one of our through trips (ending swing starting mids-ZZZ last bank) and we got to discussing the issue. My memory was jarred for the above described situation of a couple days ago. I; with help of my foreman; called maintenance control immediately notified controller of the error. Maintenance control advised they would take aircraft X out of CAT III and generate a maintenance write-up related to this issue. Controller said all was going to be ok and problem would be resolved without disruption to aircraft or schedule. I think the human factors that I let bite me in this incident were: distraction; pressure and/or maybe stress.

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Original NASA ASRS Text

Title: Two days after replacing a Primary Flight Display (PFD) on a A320; Mechanic realizes he failed to perform a required CAT-3 check on the aircraft.

Narrative: I was working several items on Aircraft X. I had the Maintenance Manual Technical Service Manual on my person as I was working this gripe. Item was an inbound log. Additionally; there was an Emergency Exit Light problem that swing shift had encountered on the overnight check. There was also a flight deck door deferred I was working also. Due to the specific nature of the gripes; working time on this aircraft took me a good portion of my night. Just as I was finishing wrapping up this aircraft; a fellow called me on the radio to come assist him at another location at the terminal with opening a radome on a different Airbus. At that moment I was just doublechecking/re-reading the Maintenance Manual for the replacement of the PFD and I was at mid-Page 407. Due to this moment; I was sure in my mind that I had satisfied the Maintenance Manual. I finished up reviewing the noted Maintenance Manual. However; due to my 'human factor;' I missed the note that a CAT III check was required when replacing a navigation display or PFD; which was on the second to last page (the page I was on when the call on my radio came in). The last sheet of the Maintenance Manual is the standard Airbus 'close up' (5 lines of text of which 3 lines are titles) which I reviewed quickly before leaving the flight deck. I would also like to note that this particular night in January was the first night the mechanic layoffs took effect. Thus; we had 7 overnight aircraft at the terminal with much work and there was just myself; my fellow. I feel that was another contributing factor. As a footnote; we had been asked by Management to try to get as much 'E' stuff accomplished as we could do; but make sure we had the planes on the first bank ready. Additionally; one of the Airbuses at the hangar was going out of service; so the station midnight Controller asked if they could use Aircraft X for a trip; almost at about the same time I got the call for help from the other. I was not tired that night. I had good sleep prior to starting my shift. This issue came to light today (Jan/09) as we started the shift because another PFD issue was on one of our through trips (ending swing starting mids-ZZZ last bank) and we got to discussing the issue. My memory was jarred for the above described situation of a couple days ago. I; with help of my foreman; called Maintenance Control immediately notified Controller of the error. Maintenance Control advised they would take Aircraft X out of CAT III and generate a maintenance write-up related to this issue. Controller said all was going to be OK and problem would be resolved without disruption to aircraft or schedule. I think the human factors that I let bite me in this incident were: distraction; pressure and/or maybe stress.

Data retrieved from NASA's ASRS site as of April 2012 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.