Orientation tolerances, when applied to plane surfaces, control flatness if a flatness tolerance is not specified.

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This statement is true. Orientation tolerances, such as parallelism or perpendicularity, can be used to control the flatness of a plane surface if a specific flatness tolerance is not specified. This is because if the orientation tolerances are within specification, it ensures that the surface is flat within a certain tolerance zone.

Orientation Tolerances, When Applied to Plane Surfaces, Control Flatness If