What was found
DURING ROUTINE C-CHECK INSPECTION, LT WING NR 1 STUB WING CRACKED 2.5 INCH, XILD 42 LWR SKIN. PERFORMED MAJOR REPAIR IAW DC8 SRM 57-2-1A FIG 1. REMOVED EXISTING DOUBLERS IAW DC8 SRM 51-1-20D, DC-8 SRM 51-1-21. PERFORMED STOP HOLE ON CRACK END. FABRICATED EXTERNAL REPAIR DOUBLER (AL 7075 T6 0.080) + INTERNAL DOUBLER (AL 7075 T6 0.063) IAW DC8 SRM 57-2-1A FIG 1, DC-8 SRM 51-1-4 (FORMING). PERFORMED HEAT TREATMENT 7075 O TO 7075 T6 IAW DC-8 SRM 51-1-1 PAGES 1, 13, 17. CLEANED, TREATED AND PRIMED AREA + REPAIR PARTS IAW DC8 SRM 51-1-8B. APPLIED SEALANT TO FAYING SURFACES IAW DC8 SRM 51-1-11. INSTALLED REPAIR PARTS IAW DC8 SRM 57-2-1A FIG 1, DC8 SRM 51-1-21, DC8 SRM 51-1-20D, DC8 SRM 51-3-1 (TORQUE).