SECTION 13: MAIN SPAR
Build Instruction Updates
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Page 13-2
- Figure 1 shows an "extra" hole on the flange. It is not used anywhere, does not need countersinking.

- Step 7: Study figure 2 which points out that the long stiffeners align at the outboard end while the short stiffeners align at the inboard end.
Page 13-4
- Step 4 has you installing AN426AD4-6 rivets, but the rivets are not part of the SB kit (as of 3/2022).
- Some builders indicate that the rivets are included in the SB kits.