AN A320 L ENG INBOARD FAN REVERSE ASSEMBLY INCURRED INSULATION DAMAGE DUE TO FAILURE TO INSTALL A REMOVED HIGH PRESSURE PNEUMATIC DUCT.

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ON OCT/MON/04 IT WAS BROUGHT TO MY AWARENESS BY ACR MGMNT THAT ACR X INCURRED DAMAGE TO THE INSULATION ON THE INNER SURFACE OF THE INSIDE THRUST REVERSER COWL IN #1 ENG. I HAD SIGNED OFF A NON ROUTINE WORK CARD FOR THE REPLACEMENT OF A HIGH PRESSURE DUCT ON THE ENG. THE SIGNOFF WAS DATED SEP/FRI/04 MY PORTION OF THE WORK ACCOMPLISHED WAS TO SAFETY WIRE 8 DUCT FLANGE ATTACH BOLTS. DUE TO THE PREVIOUS JOB STATUS OF WORK ACCOMPLISHED; I ASSUMED THAT I HAD ACCOMPLISHED THE LAST STEP AND SIGNED OFF THE WIRE CARD AS COMPLETE. WITH FURTHER RESEARCH; IT TURNS OUT THAT A DIFFERENT DUCT HAD ALSO BEEN REMOVED FOR ACCESS. THIS DUCT WAS FOUND DAMAGED AND ROUTED TO THE SHOP FOR REPAIR. AT ACR; THE PROC IS TO ADDRESS ONLY 1 DISCREPANCY PER NON ROUTINE WRITE-UP WORK CARD. THE DUCT REMOVED AND SENT TO SHOP WOULD HAVE HAD AN ADDITIONAL NON ROUTINE WRITE-UP GENERATED FOR ITS REPAIR. THE ADDITIONAL NON ROUTINE WRITE-UP WASN'T WRITTEN AND I DIDN'T RESEARCH IT. THE DUCT REMOVED FOR ACCESS WAS NOT INSTALLED AT THE TIME THE ACFT WAS RELEASED FOR SVC. AS A RESULT; AIR FLOW WAS NOT ROUTED CORRECTLY AND ERODED THE INSULATION. THE PROB WAS NOTED NUMEROUS FLTS LATER. THE THRUST REVERSER COWL AND MISSING DUCT WERE REPLACED. UNCLR JOB STATUS AND LACK OF THE ADDITIONAL NON ROUTINE WRITE-UP CONTRIBUTED TO MISSING THE DUCT INSTALLATION.