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This is a method brought in from the good old drafting board days... (perhaps to reduce thepain of drawing repetitive lines...)where the section lines were not drawn if the section plane contains the longest line of the rib...This practice is widely used in european drawings (I do not know of Americal methodology) and in India. A similar method is the rotated section view... However, I do not bother much with the section lines. When I need a planar section I make a planar section. I do not even bother to offset the section unless the drawing demands it.dr_gallup said:I never understood why sections were omitted on ribs in the first place, it certainly does not improve clarity.