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PPAP chapter 2.2.10.1-2 states that you have to conduct material and performance test for all material or performance specifications. These test shall be done on parts from a significant production run. How many units should you test, must it be proved with statistical analysis or is it sufficient with testing 2 units? In my case my company produces heat exchangers with pressure and performance specification. As we need PID approvals pressure testing (burst testing) are carried out by a third part on all new products, but we also conducts some fatigue testing (this takes up to 2 weeks for one unit). We don´t have the test capacity to test enough units for statistical analysis.