A B737-700/800 ACFT HAD INCORRECT FUEL NOZZLES INSTALLED DUE TO INCORRECT PART NUMBERS ON ENGINEERING DIRECTIVE.

Narrative

I ISSUED AN ENGINEERING ORDER TO REPLACE FUEL NOZZLES ON ACFT #2 ENG. THE ENGINEERING ORDER WAS ISSUED BECAUSE OF INTERMITTENT NO START ISSUES ON THIS ENG THAT WAS BEING TRACKED AS A CHRONIC PROB. IN THE TEXT OF THE ENGINEERING ORDER THE AMM REFS AND REQUIRED PARTS WERE IDENTED AND ANNOTATED USING ACR PART NUMBERS. THE APPROPRIATE IPC WAS UTILIZED TO IDENT THE REQUIRED PARTS TO COMPLETE THE TASK. LATER I WAS ADVISED THAT THE REMOVED FUEL NOZZLES FROM THIS ENG HAD ARRIVED AT THE REPAIR VENDOR AND A DISPARITY BTWN THE ACR SVC ORDER PART NUMBER AND THE ACTUAL FUEL NOZZLE PART NUMBER EXISTED. RESEARCH WAS CONDUCTED TO TRACK HOW THIS COULD HAPPEN. I REVIEWED THE ORIGINAL ENGINEERING ORDER AFTER XCHKING THE ACR TO MANUFACTURER'S PART NUMBER AN ERROR WAS DISCOVERED ON ONE OF ACR PART NUMBERS. NOTE: 2 PART NUMBERS ARE EFFECTIVE FOR THE CFM56-7 ENG. X 16 LOCATIONS X 4 LOCATIONS. PART NUMBER CONVERTS TO ACR PART NUMBER B. PART NUMBER X CONVERTS TO ACR PART NUMBER Z. WHAT I BELIEVE HAPPENED IS WHEN I ENTERED PART NUMBER X INTO STORES INVENTORY SYS TO CONVERT TO THE ACR PART NUMBER; A TYPOGRAPHICAL ERROR WAS MADE AND I ENTERED Y WHICH HAPPENS TO BE THE PART NUMBER FOR THE CFM56-3 FUEL NOZZLE IN THE SAME LOCATIONS. THIS FUEL NOZZLE CONVERTS TO ACR #X. NO FLAG WAS EVIDENT BECAUSE MANY OF THE PARTS REQUIRED FOR FUEL NOZZLE REPLACEMENT ARE USED ON BOTH ENG MODELS.