Pg. 21-03 Step 5: Riveted the Baggage Floor to the F-1206A Bulkhead and F-1206-L & R Baggage Ribs. Step 6: Dimpled ten nutplates and riveted them to the flanges of the F-1206A Bulkhead, Baggage Ribs and Baggage Floors. Pg. 21-08 Step 5: Riveted the L & R Seat Floor Assys to the Center Section. Deburred two F-1204H Bulkhead Caps. Primed the Bulkhead Cap Flanges and the Bot. Flg of the Center Section Bulkhead.