What was found
C-CHECK, UPPER CARGO COMPT AT STA 1600 CIRCUMFERENTIAL FRAME AT CUSP LINE WAS CRACKED RT SIDE. CUT OUT CRACKED SECTION OF FRAME AT FS 1580 RT M CARGO CABIN IAW DC-8 SRM 53-2-0 FIG 2. FABRICATED NEW SECTION OF FRAME: 6 X 2.5 AND 2 SPLICES 10 X 2.5 IAW MHA ENGINEERING NR 3126. HEAT TREATED FRAME & SPLICES 7075-0 TO 7075-T6 IAW DC-8 SRM 51-1-1, PG 1 TO 21, CLEANED REPAIR AREA PER SRM 51-1-8 PAR 6A. DRILLED NEW SECTION OF FRAME & SPLICES PER SRM 51-3-2, PG 1, 51-1-4, PG 1. TREATED, PRIMED AREA & PARTS IAW DC-8 SRM 51-1-8, PG 13 & 16. OK TO INSTALL FRAME REPAIR IAW DC-8 SRM 51-1-20D, PAR 7.