A LEAD MECHANIC NOTIFIES TWO MECHANICS THEY MISSED A REQUIRED CAT-3 CHECK AFTER THEY REPLACED THE FMGC #2 APPROX FIVE DAYS EARLIER ON AN AIRBUS A320.

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I HAD RELEASED ACFT X WHICH HAD AN FMGC #2 REPLACED. UPON REVIEW OF ACFT HISTORY FOR ACFT X; ON JUL 08; I NOTICED THAT THE MECHS WHO WORKED ON THIS DID NOT MAKE AN AUTOPLT CAT III CHK FOR THE FMGC #2 REPLACEMENT. I HAD NOTIFIED THE MECHS OF THE MISSED CAT III CHK AND HE FOLLOWED UP AND NOTIFIED LINE MAINT OF THIS DISCREPANCY. DUE TO HUMAN FACTORS AND WITH TIME CONSTRAINTS WITH A LIVE TRIP; IT SHOULD HAVE BEEN NOTICED THAT A CAT III NEEDED TO BE DONE WITH THE REPLACEMENT OF THIS UNIT. BUT WE MISSED; DUE TO THE FOCUS OF GETTING THE TRIP FIXED AND ON ITS WAY. SUPPLEMENTAL INFO FROM ACN 801736: PLANE CAME IN WITH A HORIZ STABILIZER -- DIDN'T RESET AFTER LNDG; DID AN AUTOFLT SYS TEST AND IT FAULTED FMGC #2. REPLACED FMGC #2; REDID THE AUTOFLT SYS TEST AND SYS CHKED GOOD. MISSED AUTOFLT TEST CAT III CHK AT THE END OF THE MAINT MANUAL 22-83-34 IN THE NOTE SECTION ON PAGE 409. IT WAS A LIVE TRIP IN AND WAS BEING DELAYED FOR THIS WRITE-UP. I FORGOT TO MAKE A CAT II WRITE-UP SAYING IT WAS DONE. CALLED LINE MAINT AND HAD THEM MAKE A WRITE-UP FOR THE CAT III TEST. THIS PART WAS POINTED OUT BY MY LEAD. SUPPLEMENTAL INFO FROM ACN 801734: I NOW SEE THIS WAS A HUMAN FACTORS ISSUE WITH THE TIME CONSTRAINT AND THE ONGOING DELAY OF THE FLT. THE CAT III CHK WAS MISSED IN THE RUSH OF GETTING THE ACFT FIXED AND ON ITS WAY. BE MORE FOCUSED ON THE DETAILS IN THE MAINT MANUAL AND NOT ALLOWING MYSELF TO BE RUSHED IN THE HEAT OF BATTLE.