What was found
DURING ROUTINE C-CHECK INSPECTION, A CRACK WAS DETECTED ON THE FUSELAGE, AT FS 1620 LONGERON 11R ON THE UPPER AFT CORNER OF THE AFT SERVICE DOOR CUT OUT. REPAIR ACCOMPLISHED, CUT OUT DAMAGED AREA, FABRICATION AND INSTALLATION OF REPAIR FILLER, DOUBLER AND TRIPLER IN ACCORDANCE WITH THE DOUGLAS STRUCTURAL REPAIR MANUAL.