What was found
NDT CRACK INDICATION IDENTIFIED AT FS500A +20, .35" OTBD OF S2L IN PROXIMITY TO EA 5330-04336 CHEM MILL STEP INSPECTION AND PREVENTATIVE MOD SERVICE BULLETIN AREA FWD LH DOUBLER AND FILLER. WORKING DEFECT ON LAUNCH NON ROUTINE 5310-08359/006.THIS WILL BE A MAJOR REPAIR. SKIN CUT OUT, NDT, AND DVI COMPLETE AT STA 500A + 20, STR 2L . ENSURED THAT THE WHERE SKIN REMAINING THICKNESS IS LESS THAN 0.038 INCH WAS REMOVED COMPLETELY BY THE TRIM OUT. C. HFEC INSPE CTED EDGES OF TRIM OUT PER 737 NDT MANUAL PART 6, 51-00-00, PROCEDURE 23 TO ENSURE NO CRACKS EXIST. ENLARGED THE TRIM OUT BY 0.0 40 INCH AS INSURANCE CUT. D. MAINTAINED 0.5 INCH MINIMUM CORNER RADIUS. E. MAINTAINED 2D MINIMUM EDGE MARGIN FROM FASTENER. BY V945786 VISUALLY INSPECTED ALL OPEN FASTENER HOLES,