STRAIGHTNESS TOLERANCES SPECIFIED IN NOTES OF ROUGH CASTING, ROUGH FORGING, WELDMENTS, ETC., ARE TO BE INTERPRETED AS TOTAL INDICATOR READING (TIR). STRAIGHTNESS TOLERANCES ARE APPLIED TO CONTINUOUS FLAT AND/OR CONTOURED SURFACES AND ARE SEPARATE AND INDEPENDENT OF ALL OTHER TOLERANCES. FLAT SURFACES ARE CHECKED AGAINST A STRAIGHT EDGE OR SURFACE PLATE. CONTOURED SURFACES ARE CHECKED AGAINST A CONTOUR TEMPLATE.