What was found
AT D-CHECK, CRACK ON WEB AT ANGLE ATTACH POINT AFT OF FS 1183 BLKHEAD AND RBL 8 APPROX 24 ABOVE TAILSKID CUT OUT. REMOVED TAILSKID DOOR FOR ACCESS. STOP DRILLED END OF CRACKS, HFEC, NO CRACKS BEYOND STOP DRILL. TRIMMED OUT WEB AROUND CRACK PER S/B 53-175. INSTALLED WEB REPAIR PER BOEING S/B 53-175 AND BOEING DRAWING 65C 33041. WEB DOUBLERS 7.2 BY 31.4 AND T CHORD ANGLE 7.6. INSTALLED VERTICAL BEAM PREVENTATIVE MOD PER BOEING S/B 53-175. ANGLE 4.0 BY 8.7. N/R 3313 AND 3339.