Brief Description: Drill the Close-Out and Install the Mounting
Step 9: Drill the Close-Out and Install the Mounting Nutplates Mark sixteen screw holes around the perimeter of the close-out. Each location should be 3/4" in from the edge and approximately 6” apart. The spacing of the holes isn’t critical—we suggest five holes evenly spaced across the bottom and the remaining eleven holes evenly spaced around the circular perimeter.
Next, drill #40 rivet holes for K1000-08 nutplates [158] at each of the holes in Bulkhead A. Countersink the holes on the forward face of the bulkhead and install the nutplates on the aft face using 3/32" AN426AD3 flush-head rivets. Note The close-out is now ready for installation with AN526-8R6 round-head machine screws [139], but you will access this back area again later.
