What was found
AFTER INSTALLING RT STRONGBACKS FOUND INTERCOSTALS FOR STRONGBACK TIE RODS NOT ATTACHED TO FRAME CAUSING GOUGES ON FRAME AT BS 500D BETWEEN STRINGERS 4 - 6R. ACFT GROUNDED. EVALUATED GOUGE DAMAGE AND FOUND TO BE OUT OF LIMITS IAW SRM 53-00-07-1A-1 FIG 101, DAMAGE IS IN INNER CHORD FLANGE WHICH IS NOT PERMITTED, CUTOUT DAMAGED SECTION OF FRAME AND FABRICATED REPAIR ANGLES IAW B737-900 SRM 53-00-07-2R-1, ALODINED AND PRIMED IAW SRM 51-20-01, INSTALLED REPAIR IAW SRM 53-00-07-2R-1, FOUR INTERCOSTAL ATTACH ANGLES GOUGED BEYOND LIMITS IAW SRM 53-00-07-1A, THE ANGLE EDGES WERE KNIFE EDGED, FABRICATED NEW ANGLES IAW DWG 146A9435, REV A, ALODINED AND PRIMED IAW SRM 51-20-01, INSTALLED NEW ATTACH ANGLES IAW DWG 143A9431.