1. Drew rivet line on bulkheads. 2. Marked and punched rivet locations on bulkheads. 3. Drilled rivet locations on bulkheads with #40 bit. 4. Marked denterline on top skin. 5. Drilled aft rivet location on top skin. 6. Clecoed in place and centered. 7. Taped stbd side in place. 8. Back drilled stbd top skin with #40 bit, clecoing in place. 9. Removed tape. 10. Taped port side in place and removed clecos from stbd side. 11. Back drilled port side with #40 drill, clecoiing in place. 12. Marked skin areas to be removed, port and stbd sides. 13. Removed skin, and removed selected areas. 14. Established rivet locations along lower edge of skin. 15. Reinsatalled and back drilled lower rivet locations with #40 bit. 16. Opened rivet locations with #30 bit and clecoed. 17. Removed skin. 18. Deburred holes in skin and bulkhead. 19. Primed mating surfaces on skin. 10. Reinstalled with clecos.
