PPAP stands for Production Part Approval Process. It is a standardized approval method automotive OEMs require of their suppliers. Documented and observed evidence is required of suppliers to demonstrate they can meet customer requirements before regular production runs. It is a process to show your customer that you can make their parts on an ongoing basis.
This book may give you:
Production Part Approval Process: What Is The Use Of PPAP PPAP Documents In Excel: How To Use PPAP PPAP Manual: What Are The Elements Of PPAP