What Is PPAP (Production Part Approval Process)?
Also known as: production part approval process, PSW
Definition
PPAP (Production Part Approval Process) is a standardized supplier approval package, originating in the automotive industry, that demonstrates a supplier's production process can consistently produce conforming parts at the quoted rate before shipments are authorized.
PPAP (Production Part Approval Process) Explained
PPAP defines eighteen elements a supplier may be required to submit, including design records, engineering change documents, customer engineering approval, DFMEA and PFMEA, process flow diagrams, control plans, measurement system analysis studies, dimensional results, material and performance test results, initial process studies, qualified laboratory documentation, appearance approval, sample production parts, master sample, checking aids, customer-specific requirements, and the Part Submission Warrant that summarizes and certifies the package.
Five submission levels control how much of that package actually goes to the customer. Level 1 is the warrant alone, Level 2 is the warrant with samples and limited supporting data, Level 3 is the warrant with samples and complete supporting data and is the most common default, Level 4 is customer-defined, and Level 5 requires the full package to be available for review at the supplier's site rather than shipped. Suppliers regularly assume Level 3 without confirming, which is an avoidable source of rework.
The defining requirement is that PPAP parts come from a significant production run using production tooling, production materials, production operators, and the production process at the quoted rate. Prototype parts made on a soft tool by an engineer do not qualify, because PPAP is validating the process, not just the part. The standard commonly calls for a run of 300 consecutive parts or one to eight hours of production, with the customer setting the specific requirement.
PPAP is mandatory in IATF 16949 automotive supply chains. Aerospace and defense use the analogous First Article Inspection process under AS9102, which shares the intent of documented proof of conformance but differs in structure and does not carry PPAP's five-level scheme. Many aerospace primes now request PPAP-style capability data on top of AS9102 forms, so suppliers serving both markets typically maintain one evidence set mapped into both formats.
Why It Matters
- Approval gates production shipments, so a rejected package delays launch revenue regardless of whether the parts are good.
- Forces the supplier to prove process capability at rate, catching problems before they reach a customer assembly line.
- Creates a documented baseline, so any later change in material, tooling, or location triggers a defined resubmission requirement.
- Package assembly is labor-intensive and must be quoted; unbudgeted PPAP effort commonly consumes hundreds of engineering hours per part family.
In Practice
The most frequent rejection cause is not part quality. It is a dimensional results sheet whose balloon numbering does not match the ballooned drawing, or a capability study run on parts produced before the final tooling change. A close second is a PSW signed with a stated production rate the supplier cannot actually sustain, which surfaces months later as allocation shortfalls. Building the balloon map and the control plan before the significant production run, rather than reconstructing them afterward, removes most of this rework.
Frequently Asked Questions
When does a supplier have to resubmit PPAP?
Resubmission is required for any change to design, material, supplier of a subcomponent, tooling, process, manufacturing location, or inspection method, and after production has been suspended for an extended period, commonly twelve months. Customers may also request resubmission after quality problems. The safe rule is to notify the customer of any change and let them determine the required level.
Is PPAP used in aerospace and defense?
Not as the primary standard. Aerospace uses First Article Inspection under AS9102, which requires similar evidence of conformance in a different format and without PPAP's five submission levels. However, many primes now also request capability studies, control plans, and PFMEAs, so suppliers serving both automotive and aerospace usually maintain a single evidence set mapped to both.
Related Terms
FMEA (Failure Mode and Effects Analysis)
FMEA (Failure Mode and Effects Analysis) is a structured risk assessment that identifies how a product or process can fail, the effects and causes of each failure, and existing controls, then prioritizes actions to prevent the highest-risk failures.
Cp and Cpk
Cp and Cpk are process capability indices. Cp compares the specification width to the process spread, assuming perfect centering, while Cpk also accounts for how far the process mean has drifted from the center of the tolerance.
Traceability
Traceability is the ability to follow the history, location, and application of a part or material through the supply chain and production process, both backward to its sources and forward to every product and customer it reached.
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