Steps 1-4 Installed nut plates on the upper flanges of the F1217A tunnel ribs Machine countersunk all nut plate attach holes on the F1272 forward fuselage skin Final drilled the engine mount brackets to the F1217A tunnel ribs
Machine countersinking and installing nut plates on F1217A tunnel rib upper flange
Final drill the WD1204 engine mount brackets to the F1217A tunnel ribs
Machine countersink #30 the holes in the forward flange of the F1217A tunnel ribs
