A B737-300 HAD THE INST COMPARATOR REPLACED DURING A MAINT CHK. UNIT REQUIRED AUTOLAND CAT IIIA TEST. NOT ACCOMPLISHED.

Narrative

THE TOPIC AROSE WHEN AT THE BEGINNING OF THE SHIFT I WAS SHORTHANDED; SO I ASSIGNED ONE OF THE MECHS WHO HAD COME BACK FROM LAYOFF AND WHICH I HAD WORKED WITH IN THE PAST TO DO AN OVERNIGHT CHK AND TO INSTALL THE COMPARATOR AS REQUESTED BY PLANNING AND I WOULD SIGN OFF THE LOGBOOK. I DID NOT REALIZE THAT THE COMPARATOR WAS A CAT ITEM AND DID NOT LOOK UP ITS STATUS BECAUSE OF OTHER WORK BEING PERFORMED ON OTHER ACFT ASSIGNED TO MY CREW. I USED POOR JUDGEMENT NOT TO TAKE INTO ACCOUNT THAT THE MECH HAD NOT WORKED LINE MAINT IN 2 YRS (BASE MAINT) CREW AND I SHOULD HAVE TAKEN MORE TIME TO FAMILIARIZE MYSELF WITH THE SYS BEFORE I SIGNED FOR IT. ON JUN/SAT/05 ACFT X; AN INST COMPARATOR WAS REPLACED. PER JOB CARD X; STEPS #3 AND #9 WERE TO BE ACCOMPLISHED BECAUSE THE COMPARATOR IS A CAT ITEM. JOB CARD ITEM WAS SIGNED OFF AS REMOVED AND REPLACED. NO FURTHER FUNCTIONAL CHK PER THE CARD WAS ACCOMPLISHED TO CERTIFY THE SYS AS CAT. ALSO NO CAT STATEMENT WAS SIGNED OFF TO CERTIFY THE ACFT AS CAT. NOT SURE HOW MANY FLT LEGS WERE COMPLETED; THE ACFT ROUTINE OVERNIGHT IN ZZZ2 FOR JUN/SUN. MAINT CTL WAS NOTIFIED AND THE CAT WAS DOWNGRADED.