What was found
DURING ROUTINE C CHECK INSPECTION, FOUND FUSELAGE EXTERIOR SKIN CRACKED AT STATION 1586.000 BETWEEN LONGERON 20 LEFT TO LONGERON 21 LEFT. REMOVED FASTENERS AS NEEDED TO ACCOMPLISH REPAIR. REMOVED DAMAGED AREA. FABRICATED REPAIR DOUBLER INTERNAL FINGER DOUBLERS AND FILLER. CLEANED, TREATED AND PRIMED AREA AND REPAIR PARTS. APPLIED SEALANT TO FAYING SURFACE. INSTALLED REPAIR PARTS AND NEW FASTENERS IAW DC8 SRM 53-2-1 FIG 7 SHEET 1 AND 3, DC8 SRM 51-1-21, DC8 SRM 51-1-20D, DC8 SRM 53-2-1 FIG 7 SHEETS 1-3, DC8 SRM 53-5-2 FIG 1 PAGE 2 ITEM "E", DC8 SRM 51-1-8B, DC8 SRM 51-1-11, DC8 SRM 53-2-1 FIG 7 SHEET 1 AND 3, DC8 SRM 51-1-21, AND DC8 SRM 51-1-20D, DC8 SRM 51-3-1.