What was found
DURING ROUTINE C-CHECK FOUND EXTERNAL FUSELAGE SKIN CRACKED AT STATION 45 LONGERON 28 LEFT IN AREA OF EXISTING REPAIR. PERFORMED HFEC TO VERIFY CRACK. VERIFIED, GAINED ACCESS, REMOVED FASTENERS, EXISTING DOUBLER, AND REMOVED DAMAGE. FABRICATED FILLER AND DOUBLER. TREATED, PRIMED, INSTALLED REPAIR PARTS AND FASTENERS IAW MD NDT SM 06-10-001-001, DC8 SRM 51-3-1, 51-1-21, 53-2-0, 51-1-8, AND 51-1-20D.