A DC9-30 MAIN ENTRY DOOR FRAME PRIMARY STRUCTURAL REPAIR WAS ACCOMPLISHED IMPROPERLY AND NOT CORRECTED.

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THE SIT OCCURRED ON ACR ACFT AT ZZZ ON MAY/XX/97 AT APPROX XA00 WHILE THE ACFT WAS IN DOCK FOR 'C-CHK.' WE WERE WORKING A REPAIR ON THE AFT DOOR JAMB OF THE MAIN ENTRY DOOR. SHEET METAL MECH BBB CAME AND BROUGHT ME TO THE DOOR JAMB AND SHOWED ME A PLUGGED HOLE AND BLEND OUT ON THE AFT SIDE OF THE DOOR JAMB BEHIND THE PLUGGED HOLE. WE HAD MADE THE PARTS ON MAY/XA/97 AND THE PARTS WERE DRILLED UP ON SHIFT ON MAY/XB/97. WHEN THE JOB WAS TURNED BACK TO US ON MAY/XB/97; THE MECH ON THE JOB WAS SHEET METAL MECH CCC. HE NEVER MENTIONED A PLUGGED HOLE WITH NO EDGE DISTANCE TO ANOTHER REPAIR FASTENER HOLE. THE AREA WAS NEWLY PAINTED AND THE PLUG WAS WELL HIDDEN. I CANNOT SAY FOR SURE IF THE PLUG WAS PUT THERE ON SHIFT OR IF IT PREVIOUSLY EXISTED. HOWEVER; CCC; SHEET METAL MECH ASSURES ME THE PLUG WAS NOT THERE ON MAY/XB/97 WHEN WE OPENED THE AREA. I BROUGHT SUPVR ON SHIFT TO THE JAMB AND SHOWED HIM THE PLUG. HE THEN TOLD ME; AND CCC; AND THE NEXT SHIFT SHEET METAL MECH WHO WAS PICKING UP THE JOB; TO CONTINUE ON. HE SAID IF THERE WAS ANY PROBS WITH THE JOB HE WOULD HANDLE THEM. THE POINT IS THAT THIS IS A MAJOR REPAIR DESIGNATED BY THE REPAIR FROM ENGINEERING AND A PRIMARY STRUCTURAL ELEMENT AREA. CALLBACK CONVERSATION REVEALED THE FOLLOWING INFO: RPTR STATES AFTER THE SHEET METAL MECH STARTED THE REPAIR SOMEONE WHO WORKED THE JOB ON A LATER SHIFT DRILLED HOLES WITH INADEQUATE EDGE DISTANCE AND THEN ATTEMPTED TO COVER OR PLUG THE HOLES TO CONCEAL THE MISTAKE. WHEN THE RPTR ADVISED THE FOREMAN OF THIS CONDITION AND THE NEED FOR REWORK HE WAS GIVEN ANOTHER JOB TO WORK. HE SAID THE FOREMAN ADVISED HIM HE WOULD TAKE CARE OF THIS REPAIR. THE REPAIR WAS LATER GIVEN TO ANOTHER SHEET METAL MECH WHO COMPLETED THE REPAIR WITHOUT CORRECTIVE REWORK. THE RPTR EMPHATICALLY STATES THAT THIS REPAIR IS LOCATED IN A PRIMARY STRUCTURAL ELEMENT.