PPAP Level 3 Submission Package: A Step-by-Step Guide for Quality Engineers

A PPAP Level 3 submission package is a complete dossier of all applicable AIAG PPAP 4th Edition elements — including the Part Submission Warrant, dimensional results, process capability data, PFMEA, control plan, and MSA studies — submitted physically or electronically to the customer for full review and approval before production parts are shipped.

When a Level 3 Request Lands on Your Desk

A purchase order arrives with a note: "PPAP Level 3 required before first shipment." If this is your first Level 3 package, the list of 18 elements can look overwhelming. If it is your tenth, you know exactly which element will cause the most back-and-forth with the customer's SQE — and it is rarely the one you expected.

Getting rejected at the PPAP stage delays launch, triggers containment costs, and strains the relationship with a customer who is already counting on your parts. This guide walks through every element in sequence, with practical preparation advice for each one.

What Is at Stake for a Tier-1 Supplier

A rejected PPAP submission does not just cost time. It signals to the OEM that the supplier's process is not under control, which can affect future sourcing decisions. AIAG's PPAP 4th Edition (available at aiag.org) is the governing document for most North American OEM supply chains, and customer-specific requirements (CSRs) from GM, Ford, Stellantis, and others add mandatory layers on top of it.

Missing even one required element — or submitting it in the wrong format — results in a conditional or rejected PSW. The quality engineer who owns the submission owns that outcome.

PPAP Level 3 Elements: Required Documents List

The table below maps each of the 18 PPAP elements to its Level 3 submission requirement and the document type typically used to satisfy it.

Elements 3, 4, 13, and 16 are conditional — apply them only when the customer's purchase order or CSR specifically calls them out. When in doubt, include them; a package with extra documents is almost never rejected for that reason.

How to Prepare a PPAP Level 3 Package: Step by Step

1. Obtain and review the customer's CSR before touching a single document. Ford, GM, and Stellantis each publish CSRs that override or add to AIAG defaults. Download the relevant CSR from the customer's supplier portal and create a compliance matrix. Note required sample quantities, Cpk thresholds, and any mandatory forms unique to that customer.
2. Lock the design record to the approved drawing revision. Confirm the engineering drawing revision on the purchase order matches the revision in your document control system. A mismatch between the PO revision and submitted drawing is one of the top five reasons for immediate rejection. If there is an active engineering change, obtain signed customer approval (Element 3) before proceeding.
3. Complete the Process Flow Diagram covering all operations from raw material to shipping. Include sub-contracted operations — heat treatment, plating, painting — as separate steps. Use standard symbols (per AIAG reference or ISO 5807) and number each operation sequentially. This document becomes the backbone that links your PFMEA and control plan.
4. Build the PFMEA using the AIAG-VDA FMEA Handbook (1st Edition, 2019). Assign Action Priority (AP) ratings — High, Medium, Low — rather than the legacy RPN scoring, which many customers now reject. Each failure mode must trace back to a specific operation in the process flow diagram. Reference the SAE J1739 standard for severity, occurrence, and detection criteria. If you are a design-responsible supplier, the DFMEA (Element 4) must be completed first, with its failure modes cascaded into the PFMEA.
5. Develop the Control Plan aligned directly to the PFMEA. Every characteristic in the control plan must have a corresponding PFMEA line. Include the reaction plan column — customers frequently flag control plans where reaction plans are generic ("notify supervisor") rather than specific ("sort 100% using go/no-go gauge, hold for engineering disposition"). Use the AIAG Control Plan reference manual for format guidance.
6. Conduct the Measurement System Analysis (MSA) for all gauges used on special characteristics. A variable Gauge R&R study requires a minimum of 10 parts × 2 operators × 2 trials (10-2-2 plan). The %Gage R&R result should be below 10% for critical characteristics and below 30% for non-critical, per AIAG MSA 4th Edition. Attribute MSA (Kappa study) applies to go/no-go gauges and visual inspection stations. Document each gauge's calibration status and due date alongside the study results.
7. Run the significant production run and measure dimensional results. AIAG PPAP 4th Edition requires a minimum significant production run — typically defined as at least one hour of production at the production rate, or a minimum of 300 consecutive pieces, whichever is greater, unless the customer specifies otherwise. Measure a minimum of 5 parts for dimensional results reporting; measure 30 parts for the initial process capability study on special characteristics. Balloon every dimension on the drawing, assign sequential balloon numbers, and map each number to the dimensional results report. This is where having a clean, numbered ballooned drawing saves hours of review time.
8. Calculate initial process capability (Ppk) for all special characteristics. AIAG requires Ppk ≥ 1.67 for special characteristics at PPAP submission. If a characteristic yields Ppk between 1.33 and 1.67, many customers will accept a corrective action plan alongside the submission. Below 1.33, expect a conditional approval at best. Use Ppk (performance index using overall standard deviation) rather than Cpk for initial studies, because the process is not yet demonstrated as stable. A worked example: if a shaft diameter has a specification of 25.000 ± 0.025 mm and the 30-piece study shows mean = 24.998 mm and overall σ = 0.007 mm, then Ppk = min[(25.025 − 24.998) / (3 × 0.007), (24.998 − 24.975) / (3 × 0.007)] = min[1.29, 1.10] = 1.10 — which falls below the 1.67 threshold and requires an action plan.
9. Collect material and performance test results from an accredited laboratory. The laboratory must hold NABL accreditation (India), A2LA (USA), or equivalent ISO/IEC 17025 accreditation for the relevant test scope. Submit the full test report, not just a certificate of conformance, unless the customer's CSR explicitly allows a CoC. Verify that the material specification on the test report matches the drawing callout exactly — for example, IS 2062 Grade E250 BR vs. IS 2062 Grade E350 BR are different grades and the distinction matters.
10. Complete and sign the Part Submission Warrant (PSW). The PSW is the cover document for the entire package. It must be signed by an authorised representative — typically the Plant Quality Head or equivalent. Confirm that the "Declaration" section accurately reflects the submission level (Level 3), the reason for submission (new part, engineering change, etc.), and that all elements listed as applicable are included. A PSW with blank fields or unchecked reason codes is returned immediately.
11. Compile and submit the package in the customer's preferred format. Most OEMs and tier-1 customers now accept electronic submission via supplier portals (Covisint, Coupa, or customer-specific portals). Organise documents in the same order as the 18 elements, clearly labelled. Include a cover index sheet mapping each tab or folder to its PPAP element number. Physical sample parts should be shipped separately with a packing slip referencing the PPAP submission number.

For more context on the differences between submission levels, the post on PPAP Levels 1 to 5 Explained covers when each level is triggered. For the dimensional results element specifically, PPAP Dimensional Results Report Format & Example goes into the exact format most customers expect.

Common Mistakes That Get PPAP Packages Rejected

Drawing revision mismatch

The single most common rejection reason. The drawing revision on the PSW, the dimensional results report, and the physical drawing must all match the revision on the purchase order. Lock the revision at the start of the project and do not update drawings mid-PPAP without a formal engineering change and new customer approval.

Gauge R&R performed with non-production gauges

An MSA conducted using a CMM in the metrology lab — when production inspection uses a bench micrometer on the shop floor — does not represent the actual measurement system. The AIAG MSA 4th Edition is explicit: the study must use the same gauge, operators, and environment as production. Customers' SQEs know this and will ask.

Cpk submitted instead of Ppk for initial capability

Cpk uses within-subgroup variation and assumes a stable, in-control process. At initial PPAP, the process has not been demonstrated as stable, so Ppk (using overall standard deviation) is the correct index. Submitting Cpk instead of Ppk inflates the apparent capability and will be flagged by any experienced SQE.

Generic control plan reaction plans

Reaction plans must specify a concrete action — not "inform quality manager." They should state: stop production, segregate suspect parts, 100% sort using [named gauge], and notify [specific person/role]. A vague reaction plan signals that the control plan was copied from a template and not reviewed for the actual process.

PFMEA not aligned to process flow diagram

Every operation in the process flow diagram must appear in the PFMEA, and every special characteristic in the control plan must trace back to a PFMEA line. Customers cross-reference these three documents. Gaps between them — an operation in the flow diagram missing from the PFMEA, or a characteristic in the control plan with no PFMEA line — result in a request for revision before approval.

Missing sub-supplier material certifications

If the raw material is purchased from a service centre rather than the mill directly, both the mill certificate and the service centre's certificate of conformance are required. Submitting only one of the two leaves traceability gaps that auditors will find.

How CadNexa Helps with PPAP Dimensional Results

The dimensional results element (Element 9) is the most time-consuming to prepare manually. CadNexa's FAI Report Generator produces dimensional results reports directly from ballooned drawing data in PPAP format. Upload the engineering drawing as a PDF, TIFF, or image file, balloon each dimension using the Box+Balloon OCR tool — which reads dimension values, tolerances, and GD&T types automatically — and generate a PPAP-format inspection report exportable as interactive HTML, PDF, or CSV. All three formats are accepted by most automotive customers for portal submission.

The Smart Detect Dimensions feature scans the entire drawing in one click and auto-detects dimensions, tolerances, and GD&T frames for review, which significantly reduces the time to create the ballooned drawing that must accompany the dimensional results. Try it at cadnexa.com/app.html — it takes less time to run than manually numbering the first page of a complex part drawing.

For a broader comparison of how ballooning tools handle PPAP-style reports, the post on Automated Drawing Ballooning Software vs Manual Process is worth reading alongside this guide.

Frequently Asked Questions

What documents are required in a PPAP Level 3 submission?

A PPAP Level 3 package includes all 18 elements defined in the AIAG PPAP 4th Edition manual, plus the Part Submission Warrant (PSW). The customer receives the complete package with supporting documentation — design records, engineering change documents, approved engineering change documents, DFMEA (if design responsible), process flow diagram, PFMEA, control plan, MSA studies, dimensional results, material and performance test results, initial process capability study, qualified lab documentation, appearance approval report (if applicable), sample parts, master sample, checking aids, and records of compliance with customer-specific requirements. Elements 3, 4, 13, and 16 are conditional based on the customer's CSR.

How long does it take to prepare a PPAP Level 3 package?

For a straightforward machined component, a disciplined quality team can prepare a Level 3 package in 4–6 weeks. Complex castings or multi-component assemblies with extensive DFMEA and MSA requirements can take 10–14 weeks. The longest lead items are typically the Gauge R&R study (needs production-representative parts) and the initial process capability study (requires a minimum 30-piece run).

What is the minimum sample size for PPAP dimensional results?

AIAG PPAP 4th Edition requires dimensional results from a minimum of 5 parts for Level 3 submissions. However, many automotive OEMs specify in their CSRs that 30 pieces must be measured for the initial process capability study. Always confirm the CSR requirement before committing to a sample plan — the two requirements (5 pcs for dimensional results, 30 pcs for capability) can be satisfied from the same production run.

What is the difference between PPAP Level 2 and Level 3?

Level 2 requires the PSW plus limited supporting documents — typically sample parts and a few selected documents. Level 3 is the full submission: the PSW plus all applicable PPAP elements submitted to the customer for review. Level 3 is the most commonly requested level by tier-1 and OEM customers for new part approvals. For a full breakdown of all five levels, see the PPAP Levels 1 to 5 Explained guide.

Can I use CadNexa to generate PPAP dimensional results reports?

Yes. CadNexa's FAI Report Generator produces dimensional results reports in PPAP format from ballooned drawing data. Export the report as interactive HTML, PDF, or CSV — all three formats are accepted by most automotive customers for their PPAP review packages. The Box+Balloon OCR tool pre-fills dimension values and tolerances automatically, and Smart Detect handles the initial auto-ballooning pass. Start at cadnexa.com/app.html.

Conclusion

A PPAP Level 3 submission package is not a single document — it is a structured evidence dossier proving that a production process can consistently deliver conforming parts. Work through the 18 elements in the sequence described here, lock the drawing revision on day one, conduct the MSA with production-representative gauges and operators, and submit Ppk — not Cpk — for initial capability studies. Check the customer's CSR before anything else, and cross-reference the process flow diagram, PFMEA, and control plan as a linked set rather than three independent documents.

The dimensional results element is where most teams lose the most time. Try CadNexa's PPAP-format FAI Report Generator to balloon your drawing and generate the dimensional report in one workflow — try it free for 14 days, no credit card required.