StressedOut
Well Known Member
Just got started on my wing kit. I've been reading Section 13 thoroughly before I do anything irreversible and cause a $2400 + shipping bill. There is a note on page 13-03 just above Step 3 that says:
NOTE: Machine countersink in all rib locations
This is a confusing note. I looked ahead in Sections 14 (Wing Ribs) and found that the ribs are all attached to the spar with AN470 rivets so a countersink is not warranted.
Countersinks are needed on the flanges for the screw holes and nutplate attach holes. On the spar web there are four nutplates on the outboard end fastened with AN426AD3-3.5 rivets (page 13-02, Step 2 and Figure 2). There are also three nutplates requiring countersinks on the inboard end (page 13-05, Step 3 and Figure 1). However, I do not see anywhere in the instructions that you countersink the rib locations.
What am I missing here?
NOTE: Machine countersink in all rib locations
This is a confusing note. I looked ahead in Sections 14 (Wing Ribs) and found that the ribs are all attached to the spar with AN470 rivets so a countersink is not warranted.
Countersinks are needed on the flanges for the screw holes and nutplate attach holes. On the spar web there are four nutplates on the outboard end fastened with AN426AD3-3.5 rivets (page 13-02, Step 2 and Figure 2). There are also three nutplates requiring countersinks on the inboard end (page 13-05, Step 3 and Figure 1). However, I do not see anywhere in the instructions that you countersink the rib locations.
What am I missing here?