AN AIRBUS A320 WAS RELEASED FROM HVY MAINT WITH A SKIN REPAIR NOT IN ACCORDANCE WITH THE STRUCTURAL REPAIR MANUAL; BUT WITH ENGINEERING REPAIR APPROVAL.

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AT START OF SHIFT; I WAS GIVEN WRITE-UP ZXXXY AND COPY OF SRM 53-00-11; FIGURE 202. WORKING WITH MY LEAD AND AN ENGINEER; I WAS TOLD HOW TO PROCEED WITH THE REPAIR. TRUSTING THEIR YRS OF EXPERIENCE AND EXPERTISE; I CUT OUT THE DAMAGE TO INCLUDE REMOVING SKIN IN 3 STRINGER BAYS. I MADE A GOOD CUT-OUT WITH 1 INCH RADIUS CORNERS; DIDN'T NICK STRINGERS. INSPECTION APPROVED THAT DAMAGE WAS PROPERLY REMOVED. THIS WAS THE EXTENT OF MY INVOLVEMENT WITH THE REPAIR. I LATER FOUND OUT; THE CUT-OUT WAS BEYOND LIMITS. IT WAS TO HAVE ONLY BEEN IN 1 STRINGER BAY. AN ENGINEER LOOKED AT THE CUT-OUT; AND MADE A STATEMENT ON BACK OF WRITE-UP THAT CUT-OUT WAS OK. THE DOUBLER WAS INSTALLED BY WORKERS ON A LATER SHIFT; PER SRM 53-00-11. I WAS TOLD BY A FELLOW WORKER THE SRM USED WAS FOR A SMALL REPAIR AND THERE WAS A DIFFERENT SRM REF FOR A LARGE REPAIR. THE LEAD DID NOT WANT TO REPROCESS THE WRITE-UP FOR A DIFFERENT SRM REF. THE CUT-OUT SECTION WAS APPROX 5 INCHES BY 10 INCHES; OVER 2 STRINGERS. I BELIEVE THE FINAL REPAIR WAS SAFE FOR SVC. ENGINEERING FOLLOWED THE PROGRESS ON REPAIR; INSPECTION RETURNED THE PLANE TO SVC.