1. Drill 3/32" & cleco every other hole on the rear spar, continuing from the middle, moving outward.
2. Begin drilling ribs, beginning with the second most rearward hole on rib 7, then moving outward to each end.
3. Drill the next row.
4. Remove the clecoes to make sure that the edge distance spec is being met. The smallest edge distance was 5-mm, which is the edge spec for A5 rivets, so the rivet positions are within spec.
5. Drill the 1st rear hole in each rib, then the 4th, same pattern. See Fig. 1.
