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F704M Web stiffeners


I just got done fabricating the F-704M web stiffeners. I was having a hard time determining whether or not the F-04A (forward center section) gets dimpled or countersunk to accept the rivets which hold the web stiffeners in place. Thank you in advance. :)
Hi Guys. Given that the flush rivets holding F-704M in place are to avoid conflict with F-782B Cover Support Rib once it is bolted in place, I really see that only one flush rivet is necessary, and that the top and bottom rivets could just be AN470. I just don't like countersinking for AD4 rivets on something only 40 thou thick if I don't have to.
Do you guys concur?