When I built the attach fittings for the Center Section. (the fittings that are welded to the fuselage at Station 0, top), I see a callout of .315 for the hole size with an edge margin of .437
This gives about 1.5 x Dia of fastener for edge margin. From what I've seen in the aircraft industry, E.M. should be more like 2 time Dia minimum. this would be an E.M. of .63 instead of .437
Anybody have any thoughts?