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All Cessna installed windshields have the notches in the upper edge from the factory, not just the 337 series.
I'm guessing that this makes production faster, thus less expensive. Like I said earlier, if they had holes drilled, then the holes would have to be located, the windshield removed to enlarge the holes, and then re-installed, it there was enough edge distance from the enlarged holes to the edge of the material. If there wasn't enough edge distance, then that plexi would be scrap, and would have to start all over again.
I don't know what stresses there are on a 206 w/s vs a 337. What is the VNE on the P206/U206 airplanes? That could be a clue. Is a 337 wider, what is the surface area of the two windshields?
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