Combine flour, salt, and sugar in a food processor.
Add the butter and shortening and pulse to form coarse crumbs.
While the motor is running, add the ice water, 1 tablespoon at a time, until the dough just comes together.
Turn dough out onto lightly floured surface and knead just until smooth.
Shape into a disk and wrap in plastic. Refrigerate for 45 minutes.
On a lightly floured surface, roll the dough into a circle about 14" in diameter. Place a piece of wax paper over the dough and carefully roll it up around the rolling pin. Gently unroll and place in a 9" pie plate. Crimp the edges and refrigerate.
Preheat oven to 375°.