Blend flour, sugar and salt in processor.
Add butter and shortening and cut in using on/off turns until mixture resembles coarse meal.
Add 6 tablespoons ice water and process until moist clumps form, adding more water by teaspoonfuls if dough is dry.
Gather into ball; divide into 2 pieces. Flatten each into disk.
Wrap each in plastic; chill 2 hours. (Can be made 2 days ahead. Keep chilled.
Let dough soften slightly before rolling out.)