The 18 PPAP elements are the standard set of documents and samples a supplier assembles to prove a production process can consistently make a good part, running from the design record through the process FMEA and control plan to the Part Submission Warrant that certifies the package.
PPAP, the production part approval process, is how an automotive customer decides whether to let a supplier ship a part. The 18 elements are its content: each one is evidence for a different claim about the part or the process that makes it. This guide walks all 18, groups them so they are easy to hold in your head, explains what the customer submission level changes, and covers the inconsistencies that get packages rejected. For the supplier-side playbook on assembling and submitting the package, see the companion guide to PPAP for suppliers.
What is PPAP, and where do the 18 elements come from?
PPAP is the standardized method automotive OEMs and their suppliers use to confirm that a supplier process can produce parts meeting all engineering requirements, at the real production rate, before mass production is approved. The 18 elements are defined in the AIAG PPAP manual and are referenced directly by IATF 16949 the automotive quality standard, as a customer requirement. PPAP is the final gate of the broader advanced product quality planning (APQP) process: APQP plans and develops the part, and PPAP is the evidence package that proves the plan worked.
The elements are not a random checklist. They cluster into four kinds of evidence: what the part is supposed to be (design records and changes), how the process was planned to make it (flow, FMEA, control plan), proof the process actually measures up (MSA, dimensional and material results, capability studies), and the physical proof and sign-off (samples, master sample, checking aids, and the warrant). Hold those four buckets and the 18 stop feeling like a pile.
What are the 18 PPAP elements?
Here is the full list, in the order the AIAG manual uses, with what each element proves. This is the content of a full package; which of these you physically submit depends on the level your customer assigns.
- Design records. The customer engineering drawing or CAD data for the part, the master reference every other element is checked against.
- Authorized engineering change documents. Any approved changes not yet folded into the design record, proving the part reflects the current, agreed configuration.
- Customer engineering approval. Documented customer sign-off where the drawing or specification requires it, often for prototypes or deviations.
- Design FMEA. The design FMEA showing the design risks were analyzed, usually owned by the design-responsible party.
- Process flow diagram. The map of every step the part passes through, from receiving to shipping, the backbone the PFMEA and control plan hang on.
- Process FMEA. The process FMEA proving the ways the process could fail were analyzed and the high-risk ones controlled.
- Control plan. The control plan listing what the floor checks, how often, with what method, and how it reacts, the working output of the PFMEA.
- Measurement system analysis (MSA). Studies such as gauge R and R proving the gauges used to inspect the part are capable, so the measurements can be trusted. See measurement system analysis.
- Dimensional results. A measured result for every dimension and specification on the ballooned drawing, proving actual parts meet the print.
- Records of material and performance tests. Material certifications and functional or performance test results the specification calls for.
- Initial process studies. Capability results, typically Ppk or Cpk on the customer-designated special characteristics, proving the process is not just correct once but consistently capable.
- Qualified laboratory documentation. Evidence the labs that ran the tests are qualified, with scope and accreditation where required.
- Appearance approval report (AAR). For parts with appearance requirements, a customer sign-off on color, grain, and finish.
- Sample production parts. Parts made from the real production process, at the real rate, not prototypes.
- Master sample. A retained, signed-off part used as the reference standard for future production and disputes.
- Checking aids. Any fixtures, gauges, or templates built specifically to check this part, documented and, where required, capability-verified.
- Customer-specific requirements. Any additional records the specific customer mandates beyond the standard elements.
- Part Submission Warrant (PSW). The cover sheet that summarizes the submission, states the reason and level, and carries the supplier signature certifying the whole package. Nothing is approved until the PSW is signed.
Which elements are always required, and which depend on the level?
The customer sets the submission level, and the level decides what physically goes to the customer versus what stays retained at your plant. The elements themselves are all completed regardless; the level only governs what you ship. The supplier does not pick the level, the customer does.
| Level | What is submitted to the customer | Typical use |
|---|---|---|
| Level 1 | PSW only (plus appearance report if applicable) | Bulk material or low-risk commodity parts |
| Level 2 | PSW with samples and limited supporting data | Lower-risk parts, established supplier |
| Level 3 | PSW with samples and complete supporting data | The default for most new parts |
| Level 4 | PSW and other requirements as the customer defines | Customer-specific arrangements |
| Level 5 | PSW with samples and complete data reviewed at the supplier site | New suppliers, major changes, safety-critical parts |
What are the common gaps that get a PPAP rejected?
Rejections are rarely a missing element. They are almost always an inconsistency between elements or a weak result inside one. The classic is revision mismatch: the drawing has been revised, but the control plan or dimensional results still reference the old revision, so the reviewer cannot trust that the package describes one part. Part numbers and revision levels have to match identically across the PSW, the drawing, the dimensional results, the PFMEA, and the control plan.
The other frequent gaps: dimensional results that do not cover every ballooned characteristic, since customers expect full balloon coverage; capability below the customer threshold on a special characteristic, a common trigger for interim rather than full approval; a process flow, PFMEA, and control plan that disagree with each other on steps or characteristics; a PSW with a missing signature, wrong revision, or mismatched date; and unaddressed customer-specific requirements, which are easy to forget precisely because they are not on the standard list.
By the numbers: PPAP as a defined standard
PPAP is not a preference; it is a published requirement. The AIAG PPAP manual defines the process and its elements, and it is the reference the automotive supply chain submits against (Automotive Industry Action Group (AIAG)). IATF 16949, the automotive quality management standard, requires conformance to PPAP as a customer requirement, which is why a supplier certified to that standard still has to clear PPAP for each part (IATF Global Oversight). The through-line: PPAP exists so approval is based on evidence a production process is capable, not on a promise that it will be.
How do the elements fit with APQP and IATF 16949?
PPAP is the last checkpoint of APQP, not a separate project. Most of the 18 elements are produced during APQP as normal development work: the DFMEA and PFMEA, the process flow and control plan, the MSA and capability studies. PPAP simply gathers that work into an evidence package and adds the samples and the warrant. If APQP was done well, PPAP is mostly assembly; if APQP was skipped, PPAP becomes a scramble to manufacture documents after the fact, which is exactly when the inconsistencies creep in.
Within IATF 16949, PPAP is the mechanism that proves a specific part meets requirements, while the standard governs the quality system around it. The two are complementary: the system keeps the process disciplined, and PPAP demonstrates the result for each part and each significant change. A change to the part or process, a new supplier, a new tool, a moved line, re-triggers PPAP, which is why the elements have to stay maintained, not filed and forgotten.
How do you keep a PPAP package consistent?
The hardest part of PPAP is not producing any single element; it is keeping all 18 agreeing with each other over time. The package is a snapshot, and the moment the drawing, the control plan, or the process changes, that snapshot can go stale in one document while the rest move on. When the elements live as scattered files owned by different people, nobody sees the mismatch until the customer does.
The fix is keeping the evidence current where the work happens. When dimensional results, capability data, and control-plan checks are captured live at the point of inspection and tied to the part and revision, the package reflects what the process is actually doing, and a drifting characteristic surfaces before it becomes a rejected submission. That is the live capture Harmony brings to the floor through station-level data capture so the numbers behind your PPAP are the real ones, not last quarter recollection. CLS made exactly that move, from quality records reconstructed at month end to records captured as the run happened, which is the same discipline a clean PPAP package demands. For the step-by-step on assembling and submitting one, keep going with PPAP for suppliers. No rip-and-replace.