On DWG 11, there seem to be two rivet callouts on the main spar that I ran across that aren't really mentioned anywhere in the build steps.
The first, it looks to be a set of flush-head AD3-4 rivets on the bottom of the main spar, which would rivet the forward-most flange hole of the main ribs to the main spar, somewhat next to the tank screw holes. I am correct in thinking these holes in the main spar get countersunk and riveted before the tanks are bolted on, such that the rivets are basically under / inside the screwed-in tank skins?
Secondly, there are two flush-head AD4-6 rivets, one each above and below the K1000-4 platenuts in the main spar root. What are these rivets holding to the main spar? I can't seem to find anything connected there in the wing drawings.
Thanks!
The first, it looks to be a set of flush-head AD3-4 rivets on the bottom of the main spar, which would rivet the forward-most flange hole of the main ribs to the main spar, somewhat next to the tank screw holes. I am correct in thinking these holes in the main spar get countersunk and riveted before the tanks are bolted on, such that the rivets are basically under / inside the screwed-in tank skins?
Secondly, there are two flush-head AD4-6 rivets, one each above and below the K1000-4 platenuts in the main spar root. What are these rivets holding to the main spar? I can't seem to find anything connected there in the wing drawings.
Thanks!