What was found
DURING ROUTINE C-CHECK INSPECTION, RT WING NR 4 WING DOUBLER LWR SKIN CRACKED .25 INCH, XS 520.222. PERFORMED MAJOR REPAIR IAW DC8 SRM 57-2-1A FIG 1 PAGE 3. REMOVED CRACKED DOUBLER IAW DC8 SRM 51-1-20D. STOP DRILLED CRACK. FABRICATED EXTERNAL REPAIR DOUBLER (AL7075 T6 0.063) IAW DC8 SRM 57-2-1A FIG 1. CLEANED, TREATED AND PRIMED AREA & REPAIR PARTS INNER FACE IAW DC8 SRM 51-1-8B. APPLIED SEALANT TO FAYING SURFACE IAW DC8 SRM 51-1-11. INSTALLED REPAIR PARTS IAW DC8 SRM 57-2-1A FIG 1 PAGE 3, DC-8 SRM 51-1-21, DC-8 SRM 51-1-20D AND DC-8 SRM 51-3-1 (TORQUE).