aarvig
Well Known Member
I'm working on my 9A and I have a question regarding deburring the wing skin/spar flange/wing rib complex. The instructions say to drill and deburr wing rib to spar attach holes. This does not include the spar flange/rib holes because a skin will be drilled, dimpled and installed on top of the to be countersunk spar and then riveted to the rib. My question is this...if I rivet the ribs to the wing spars now and drill the spar flange holes later per instruction, how do I deburr the holes in the skin, flange and rib? Does it make sense to drill them now and deburr them before assembly, even if the spar hole will eventually be countersunk? What have you guys done?