Gap Fairing and Countersinking Longerons

[dwollen89]

I'm getting ready to countersink my longerons. I've been checking and re-checking to make sure that I don't countersink something that I'm not supposed to. In looking at the rivet callouts, it appears that all the holes get countersunk. However, in doing my due diligence I stumbled on the gap fairing drawing that shows seven holes that don't get countersunk. I'm having a hard time interpreting the drawing to identify what holes these are and secondly, how to address them. The gap fairing is only .025 thick, so does that get countersunk along with the underlying skin, thus leaving the longeron untouched? Any advice here would be appreciated.

Thanks!

 

[Desert Rat]

If you're talking about the gap fairings under the horizontal, you're suppose to eventually tap threads in the longeron for screws to make those fairings removable.

You'd have to look at the print to verify, but I want to say that Vans calls out pan head screws there because If you countersink the longerons at those locations there isn't much meat left to cut threads into.

Personally, I don't see why those fairings would ever have to come off again, so once everything was fit I just riveted them on with pan head blind rivets.