The longeron Flanges are 22mm and 20mm. It is quite clear on the bottom skin that the 22 mm side overlaps the bottom skin, however when it gets to the directions and drawings for installing the top longerons it does not appear clear to me whether the longer side overlaps the top skin or the side skins.  The manual is referring to the side skin when it says do it the same as the bottom skin, which would leave the 22mm overlapping the side skin at the top.  Also, since there is A5 rivets in both flanges at the splice, I am having a hard time getting my head around why one needs the longer flange on one side to preserve edge distance. It would be appreciated if someone could direct me to the drawing that clarifies the latter and why one flange is wider.

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