Division (a) The production inspection system required under point 21.A.125A(a) shall provide a means for determining that:

incoming materials, and bought or subcontracted parts, used in the finished product are as specified in the applicable design data;

incoming materials, and bought or subcontracted parts, are properly identified;

processes, manufacturing techniques and methods of assembly affecting the quality and safety of the finished product are accomplished in accordance with specifications accepted by the F1CAA;

design changes, including material substitutions, have been approved under Subpart D or E and controlled before being incorporated in the finished product.