Using a nutplate as a drill guide match-drill #40 the nutplate attach pattern into the F-1013-R Fwd Fuselage Longeron at each of the seven locations match-drilled previously. Machine countersink these holes for the head of an AN426AD3 rivet on the upper side of the longeron. Deburr all the holes in the longeron drilled in this step. Install nutplates to the Iongeron.
