Narrative:

Replaced post V811 thales avionics suite software with non-interchangeability pre-V811 thales avionics suite software. When I came in to work; my lead told me I needed to go to ZZZ and meet aircraft X and write up the #2 mfd required replacement per maintenance control. I was told that maintenance control also had already ordered the mfd and had stores sent it to ZZZ. When I got to ZZZ; the ground service agent brought me the mfd and I waited till aircraft X got there. When aircraft X landed; I got in the aircraft and wrote up the #2 mfd and removed the mfd. I looked at the part number of the removed unit and saw part #XXXX and the new part number svcable tag part number was xxxxyy. I didn't realize that the software version number was on the back of the unit at a different location; so installed it and it operations tested good. When I got back to base; I tried to take it off tail and place the new one on tail in the maintenance computer and it wouldn't let me. My shift was over and I asked the next shift to look into it. The next morning when I came in; I saw the part was still in the shop with a note on it from previous shift saying I needed to go to engineering and have that part number added to the maintenance computer. Because I was so busy that day; I didn't have a chance to look into it until the end of the shift. I left a little early and I remembered the part hadn't been dealt with; so I called the lead and asked him to look into it. He called me about 1/2 hour later and told me the part wasn't compatible and told maintenance control and they aog'ed the aircraft until the right part was installed. Supplemental information from acn 741963: my understanding is that our 'information only' quick list is not to be used for installation and that the maintenance computer will not let the expediter issue a part for a particular aircraft if this part is not a valid part number. Workload; constant distraction and no parts ordering person in maintenance control contributed to the event. Supplemental information from acn 741965: when the technician returned to the avionics shop; he tried to remove and install the #2 mfd in the maintenance computer system and it would not let him do so. It was at this time he realized that the part numbers were different and there was 2 additional numbers at the end of the base number that he did not notice on the units..

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Original NASA ASRS Text

Title: A DE HAVILLAND DHC-8-400 ACFT THALES AVIONICS SUITE POST V811 SOFTWARE; MULTI-FUNCTIONAL DISPLAY (MFD) WAS REPLACED WITH A NON-INTERCHANGEABLE PRE V811 SOFTWARE. ACFT GROUNDED.

Narrative: REPLACED POST V811 THALES AVIONICS SUITE SOFTWARE WITH NON-INTERCHANGEABILITY PRE-V811 THALES AVIONICS SUITE SOFTWARE. WHEN I CAME IN TO WORK; MY LEAD TOLD ME I NEEDED TO GO TO ZZZ AND MEET ACFT X AND WRITE UP THE #2 MFD REQUIRED REPLACEMENT PER MAINT CTL. I WAS TOLD THAT MAINT CTL ALSO HAD ALREADY ORDERED THE MFD AND HAD STORES SENT IT TO ZZZ. WHEN I GOT TO ZZZ; THE GND SVC AGENT BROUGHT ME THE MFD AND I WAITED TILL ACFT X GOT THERE. WHEN ACFT X LANDED; I GOT IN THE ACFT AND WROTE UP THE #2 MFD AND REMOVED THE MFD. I LOOKED AT THE PART NUMBER OF THE REMOVED UNIT AND SAW PART #XXXX AND THE NEW PART NUMBER SVCABLE TAG PART NUMBER WAS XXXXYY. I DIDN'T REALIZE THAT THE SOFTWARE VERSION NUMBER WAS ON THE BACK OF THE UNIT AT A DIFFERENT LOCATION; SO INSTALLED IT AND IT OPS TESTED GOOD. WHEN I GOT BACK TO BASE; I TRIED TO TAKE IT OFF TAIL AND PLACE THE NEW ONE ON TAIL IN THE MAINT COMPUTER AND IT WOULDN'T LET ME. MY SHIFT WAS OVER AND I ASKED THE NEXT SHIFT TO LOOK INTO IT. THE NEXT MORNING WHEN I CAME IN; I SAW THE PART WAS STILL IN THE SHOP WITH A NOTE ON IT FROM PREVIOUS SHIFT SAYING I NEEDED TO GO TO ENGINEERING AND HAVE THAT PART NUMBER ADDED TO THE MAINT COMPUTER. BECAUSE I WAS SO BUSY THAT DAY; I DIDN'T HAVE A CHANCE TO LOOK INTO IT UNTIL THE END OF THE SHIFT. I LEFT A LITTLE EARLY AND I REMEMBERED THE PART HADN'T BEEN DEALT WITH; SO I CALLED THE LEAD AND ASKED HIM TO LOOK INTO IT. HE CALLED ME ABOUT 1/2 HR LATER AND TOLD ME THE PART WASN'T COMPATIBLE AND TOLD MAINT CTL AND THEY AOG'ED THE ACFT UNTIL THE RIGHT PART WAS INSTALLED. SUPPLEMENTAL INFO FROM ACN 741963: MY UNDERSTANDING IS THAT OUR 'INFO ONLY' QUICK LIST IS NOT TO BE USED FOR INSTALLATION AND THAT THE MAINT COMPUTER WILL NOT LET THE EXPEDITER ISSUE A PART FOR A PARTICULAR ACFT IF THIS PART IS NOT A VALID PART NUMBER. WORKLOAD; CONSTANT DISTR AND NO PARTS ORDERING PERSON IN MAINT CTL CONTRIBUTED TO THE EVENT. SUPPLEMENTAL INFO FROM ACN 741965: WHEN THE TECHNICIAN RETURNED TO THE AVIONICS SHOP; HE TRIED TO REMOVE AND INSTALL THE #2 MFD IN THE MAINT COMPUTER SYS AND IT WOULD NOT LET HIM DO SO. IT WAS AT THIS TIME HE REALIZED THAT THE PART NUMBERS WERE DIFFERENT AND THERE WAS 2 ADDITIONAL NUMBERS AT THE END OF THE BASE NUMBER THAT HE DID NOT NOTICE ON THE UNITS..

Data retrieved from NASA's ASRS site as of January 2009 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.