PPAP (Production Part Approval Process)

The PPAP (Production Part Approval Process) is a standardized procedure for the formal approval of products and processes in industrial series production. Its objective is documented evidence that a supplier can manufacture a product in accordance with all technical, legal, and customer-specific requirements under series production conditions.

PPAP is a central element of quality management in the automotive industry and is closely linked to the requirements of IATF 16949. It connects product development, process planning, and series production in a formalized approval process.

Systemic Role in the Product Development Process

PPAP is typically part of structured product development processes such as APQP. While APQP defines the planning and validation phases, PPAP represents the formal evidence that these planning results have been implemented successfully.

Systemically, PPAP fulfills the following functions:

• verification of the conformity of product and process,
• documented customer approval before the start of series production,
• assurance of reproducibility under series conditions,
• transparent evidence within quality assurance.

Elements of a PPAP Submission

A complete PPAP submission consists of a defined number of standardized records. The specific scope depends on the agreed submission level. Typical elements are:

• design records and specifications,
• engineering change documents,
• design and process FMEA (FMEA),
• process flow diagram,
• control plan,
• measurement system and inspection equipment capability studies,
• material and performance test results,
• initial sample inspection report,
• initial process capability studies,
• Part Submission Warrant (PSW) as the formal approval declaration.

Together, these documents demonstrate the supplier’s ability to manufacture a product in a stable and specification-compliant manner.

Submission Levels

PPAP defines different submission levels that determine the scope of the documentation to be submitted. They range from a submission of the PSW alone to the complete submission of all records.

The applicable level is agreed between customer and supplier and is based on the risk classification, product complexity, and scope of change.

Relationship with Process Capability

A central element of PPAP is the evidence of process capability. Statistical indices are used to demonstrate that the process operates stably within defined tolerances. Methods of statistical process control support this evaluation.

The initial process capability study serves as the basis for series approval and forms the reference for subsequent ongoing process monitoring.

Distinction from Initial Samples and Series Inspection

PPAP is not to be equated with a single initial sample or an isolated inspection report. Rather, it is a comprehensive approval procedure that integrates product, process, and documentation evidence.

Series inspections and ongoing quality monitoring take place after PPAP approval and are part of continuous process control.

Normative Classification

PPAP is an industry-specific procedure of the automotive industry and part of the requirements of IATF 16949. This standard builds on the basic principles of ISO 9001 and extends them with specific requirements for product and process approval.

PPAP is therefore an operational instrument within a quality management system anchored in standards.

FAQ – Frequently Asked Questions About PPAP

What does PPAP stand for?

PPAP stands for Production Part Approval Process and refers to a standardized procedure for the formal approval of products and processes before the start of series production.

When is a PPAP carried out?

A PPAP is carried out for new parts, product changes, process changes, relocations of production, or at the request of the customer.

Is PPAP only relevant in the automotive industry?

PPAP is primarily anchored in the automotive industry, but can also be applied in other industries with comparable approval requirements.

What role does process capability play in PPAP?

Process capability is a central part of the PPAP evidence and demonstrates that the production process operates stably and in compliance with specifications under series conditions.

Standards and Norms

• IATF 16949 – quality management in the automotive industry
• ISO 9001 – quality management systems
• AIAG reference manual “Production Part Approval Process (PPAP)” – one of the AIAG Core Tools

Further reading: Production part approval process (Wikipedia).

Further Internal Content

• APQP as the overarching product development process
• Initial samples as the physical reference for series release
• Initial sampling and PPAP in the CAQ system

AI-assisted · Editing and publication: Christian Sedlag · Last updated: 28 October 2026