What was found
DURING MAINTENANCE WALKAROUND, SUSPECTED CRACK ON AFT RIVET HOLE LOWER AFT CORNER OF FWD AIR STAIR DOOR. VERIFIED CRACK APPROXIMATELY .5" THROUGH RIVET FASTENER HOLE IAW NDT SPM 06-10-01.001. REMOVED DAMAGE AND DRILLED UP REPAIR DOUBLER IAW SRM 53-05, REPAIR 57A. INSPECTED AREA AND REPAIR DOUBLER IAW SRM 53-01-1A4, NO CRACKS FOUND. INSTALLED REPAIR IAW SRM 53-05, FIG 57A. REPAIR INSTALLATION OK IAW SRM 53-05, FIG 57A. RESTORED FINISH IAW SRM 53-05, FIG 57A.