What was found
DURING ROUTINE C CHECK INSPECTION FOUND EXTERNAL SKIN CRACKED AT STATION 405.000, LONGERON 12 RIGHT. CORRECTIVE ACTION: REMOVED FASTENERS. REMOVED DAMAGED AREA. FABRICATED REPAIR PARTS. PERFORMED NDT INSPECTION, NO CRACKS OR CORROSION FOUND. CLEANED, TREATED AND PRIMED AREA AND REPAIR PARTS. APPLIED SEALANT TO FAYING SURFACES. INSTALLED REPAIR PARTS. IAW DC-8 SRM 51-3-1, DC-8 SRM 51-1-20D, DC8 NDT SPM PART 06-10-01-011, DC-8 SRM 51-1-8B, DC-8 SRM 51-1-11, FAA FORM 8100-9 DATED 09-26-06, BOEING MSG # 1-22835486-7 DATED 09-26-06, ROD SKETCH 06-09-25-002, AND SEMAN ENGINEERING ORDER NUMBER 2006727 DATED 09-26-06.