Hi All,

I'm wondering why we don't use Robertson screws (http://joneakes.com/jons-fixit-database/418-History-of-the-Robertson-Screw)  on our airplanes... namely on the cowls and other areas that are removed often.   Having taken my cowling off and on about 15 times in the last couple months, the Phillips screws get chewed up pretty good.  The Robby screws would be infinitely better I would think -- certainly cosmetically they would look better after many de-cowlings.

Is the main reason because the Robertson screws are Canadian and the Phillips are US and the airplanes are US?  Or is there a technical (or other) reason we don't use them?

-Dico