What was found
DURING ROUTINE C-CHECK INSPECTION, INSTALLATION OF FWD LAV DRAIN MAST AT LWR CENTERLINE. PERFORMED MAJOR REPAIR IAW FAA FORM 8110-3 ATI DWG H74-102 REV A, EO SEMAN 2006102 DATED 01-13-06. REMOVED EXISTING DRAIN MAST IAW DC8 SRM 51-3-0. FABRICATED REPAIR DOUBLER (AL 7075 T6 0.125) IAW ATI DWG H74-102. CLEANED, TREATED AND PRIMED AREA & REPAIR DOUBLER IAW DC8 SRM 51-1-8B. APPLIED SEALANT TO FAYING SURFACES IAW DC8 SRM 51-1-11. INSTALLED EXTERNAL REPAIR DOUBLER IAW ATI DWG H74-102, DC-8 SRM 51-3-0, DC8 SRM 51-3-1 (TORQUE).