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Countersinking wing spar

Michael Burbidge

Well Known Member
On page 10-03 Step 3 instructs to countersink 7 specific #40 holes in top and bottom flange. Then step 7 instructs to countersink remaining skin and rib attach holes.

Two questions:

1) Why was step 3 specifically called out? It's puzzling why those 7 holes are part of step 7. Aren't they rib attach holes?

2) Does step 7 refer to the rest of the holes in the flanges? i.e. Are there any remaining holes that aren't skin and rib attach holes?

Thanks,
Michael-
 
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