A B767-300ER WAS DISPATCHED TWICE WITH THE INCORRECT SELCAL DECODER INSTALLED. CAUSED BY DIFFERENCE BTWN CONTRACT MAINT AND CARRIER'S ILLUSTRATED PARTS CATALOGS.

Narrative

IT SEEMS THAT I HAVE ETOPS RELEASED AN ACFT WITH THE WRONG SELCAL DECODER INSTALLED. INSTALLED PART NUMBER XXX-XXXB (WRONG EFFECTIVITY) AND WHAT WAS REMOVED WAS PART NUMBER XXX-XXXA (THE CORRECT EFFECTIVITY). ACR Y IS OUR MAINT CONTRACT PROVIDER. DURING YESTERDAY'S MAINT CONFERENCE CALL ACFT WAS BEING ROUTED WITH 'SELCAL INOP' AND A PART ORDER FORM WAS SUBMITTED FOR PART NUMBER XXX-XXXB; BUT WAS INFORMED BY MAINT CTL THAT THIS IS AN ACR Y COMMON PART AND CHK TO SEE IF IT IS STOCKED HERE LOCALLY. CALLED AND VERBALLY CONFIRMED WITH ACR Y STORES THAT PART NUMBER XXX-XXXB WAS STOCKED IN ZZZ. INSTRUCTIONS WERE TO REPLACE SELCAL DECODER WITH STOCKED ITEM TONIGHT. SELCAL DECODER WAS REPLACED AND OPERATIONAL CHKED NORMAL PER AMM BY ACR Y MAINT. I RPTED TO WORK THE NEXT DAY AND REVIEWED THE MAINT DOCUMENTS THAT WERE PERFORMED ON ACFT LOG PAGES; WORK CARDS SEEM TO BE PROPERLY FILLED OUT. ETOPS RELEASED ACFT FOR FLT. LATER; UPON CLOSER EXAM OF UNSERVICEABLE TAG FOR SELCAL DECODER NOTICED LAST PART NUMBER REMOVED AND INSTALLED WERE DIFFERENT. CONFIRMED WITH OUR IPC THAT SELCAL DECODER INSTALLED WAS NOT EFFECTIVE FOR ACFT. IMMEDIATELY CALLED MAINT CTL AND INFORMED OF DISCREPANCY. ACFT ARRIVED WITH NO DISCREPANCY ON SELCAL SYS. ACFT WAS GNDED AND CORRECT PART WAS INSTALLED BY OUR MAINT AND ACFT WAS RELEASED FOR SVC INCURRING NO DELAY. FOUND OUT THAT BOTH SELCAL DECODER PART NUMBER XXX-XXXB AND XXX-XXXA IS LISTED UNDER THE SAME PART NUMBER IN THE ACR Y SERVICEABLE ACFT PARTS SYS AND IS INTERCHANGEABLE. WHILE OUR IPC POINTS OUT THAT THESE 2 PARTS ARE NOT INTERCHANGEABLE. FACTORS THAT CONTRIBUTED TO THIS WAS HOW THE ACR Y PARTS SYS DOES NOT RECOGNIZE OUR ACR PARTS EFFECTIVITY AND ACR Y MAINT ASSUMING PART IS EFFECTIVE FOR OUR ACFT. 2 POSSIBLE SOLUTIONS TO REMEDY THIS SO IT DOES NOT HAPPEN AGAIN; IS TO INTEGRATE ACR Y PARTS SYS WITH OUR PARTS SYS WHICH IN TURN WILL BUILD UP BETTER COM WITH ACR Y AND US. ALSO I AM GOING TO IMPLEMENT CERTAIN PROCS TO CLOSELY MONITOR PARTS ON AND OFF.