Production Part Approval Process (PPAP)

The Production Part Approval Process (PPAP) is a standardized framework used in the automotive and manufacturing industries to ensure that suppliers can consistently provide products that meet all engineering design records and specification requirements. Developed by the Automotive Industry Action Group (AIAG), PPAP serves as a critical quality assurance tool to minimize risks during the transition from product design to full-scale production.

The Purpose of PPAP

The primary goal of PPAP is to provide objective evidence that all customer engineering design record and specification requirements are properly understood by the supplier and that the manufacturing process has the capability to produce the product consistently during an actual production run.

When is PPAP Required?

PPAP submission is generally required under several conditions, including:

• A new part or product is being introduced.
• Correction of a discrepancy on a previously submitted part.
• Engineering changes to design records, specifications, or materials.
• Use of new or modified tooling (except for perishable tools).
• Production from new or significantly repaired tooling.
• Production following a long period of inactivity (usually 12 months).

The 18 Elements of PPAP

The PPAP process consists of 18 specific elements. While not all elements are required for every submission (depending on the customers request level), they form the core documentation package:

1. Design Records: A copy of the drawing or CAD model.
2. Engineering Change Documents: Evidence of any approved changes.
3. Customer Engineering Approval: Proof of approval for engineering tests.
4. Design FMEA: Design Failure Mode and Effects Analysis.
5. Process Flow Diagram: Mapping of the manufacturing steps.
6. Process FMEA: Assessment of potential failures in the production process.
7. Control Plan: A plan for managing quality during production.
8. Measurement System Analysis (MSA): Studies to ensure gauge and measurement accuracy.
9. Dimensional Results: Verification that dimensions meet print requirements.
10. Records of Material/Performance Tests: Validation of material compliance.
11. Initial Process Studies: Statistical analysis to verify process capability (Cpk/Ppk).
12. Qualified Laboratory Documentation: Accreditation status of testing labs.
13. Appearance Approval Report (AAR): For parts with specific aesthetic requirements.
14. Sample Production Parts: Physical samples from the production run.
15. Master Sample: A reference sample retained by the manufacturer.
16. Checking Aids: Documentation of tools used for part inspection.
17. Customer-Specific Requirements: Additional needs requested by the OEM.
18. Part Submission Warrant (PSW): The summary document signed by the supplier.

Submission Levels

Customers typically define five levels of PPAP submission. Level 3 is the industry default, requiring a full submission of all documents. Level 1 requires only a Part Submission Warrant (PSW) and appearance items, while Level 5 requires a review of the documents at the supplier's manufacturing location.

The Benefits of PPAP

By investing in the PPAP process, manufacturers significantly reduce the likelihood of defective parts reaching the production line. It forces communication between suppliers and customers early in the product lifecycle, clarifies expectations, and fosters a culture of continuous improvement. Ultimately, PPAP leads to higher product reliability, reduced scrap rates, and improved overall quality management.