What was found
DURING ROUTINE C CHECK INSPECTION, EXTERNAL SKIN SHOWS CRACK AT STATION FS 1750.000 LONGERON 15 LEFT. REMOVED DAMAGED AREA. FABRICATED REPAIR DOUBLER INTERNAL FINGER DOUBLER. PERFORMED NDT INSPECTION. NO CRACK NO CORROSION FOUND. CLEANED, TREATED AND PRIMED AREA AND REPAIR PARTS. INSTALLED REPAIR PARTS IAW DC8 SRM 53-2-1 FIGURE 7 SHEET 1 AND 4, SRM 53-5-3 FIGUE 1 ITEM "D", DC8 NDT SPM PART 08-00-02 TO 07, FORM SEMAN 242-4, DC8 SRM 51-1-8B, SRM 51-1-21, 51-1-20D, AND 51-3-1.