The production part approval process is a procedure from QS 9000, in which series parts are sampled and which has now been replaced by ISO/TS 16949. This procedure comes from the automotive industry and has been implemented there successfully for many years.
This is above all a question of the quality of the supplied parts. This means the tool or batch part must correspond to the drawing. Alongside testing the delivered parts, the part submission warrant (PSW) is a key element of the sampling process, which summarizes and sets down all of the important information about requirements and tests. The precise ordering and shipping process differs widely from company to company. The same applies to sampling. For instance, safety-critical parts are sampled long before the start of mass production, while other parts are sampled shortly before the start of production. However, all of the sampling procedures have one thing in common: the division into five different sample levels.