How to Create a PPAP (Production Part Approval Process) Plan

PPAP submissions that fail on first attempt cost weeks. Here's the Gantt chart template that sequences all 18 elements and keeps your automotive customer approval on track.

How to Create a PPAP (Production Part Approval Process) Plan

The Problem: PPAP Submissions Fail When Elements Are Treated as a Checklist, Not a Project

PPAP rejections from automotive customers are expensive. A first-submission rejection means weeks of rework, re-testing, and re-submission — weeks that eat into your production launch timeline and put customer delivery commitments at risk. And the rejection is almost never because the parts don't work. It's because the documentation package was incomplete, the measurement system analysis wasn't done correctly, or the process capability data didn't meet the Cpk requirement.

The root cause is treating PPAP as a checklist to complete at the end of the NPI project rather than as a project within the project that runs in parallel with tooling, process development, and production validation. PPAP Level 3 submission requires 18 elements of documentation, each with specific content requirements. Several of them (dimensional results, material testing, process capability) require physical parts produced at full production rate on production tooling and equipment. You can't produce those parts until tooling is qualified. You can't run process capability until you have process stability. The sequencing has to be right.

A PPAP Gantt chart sequences all 18 elements, assigns owners, and builds in the dependencies so nothing is missing on submission day. gantt-chart.io lets you build the PPAP timeline and share it with your quality team and the customer so they can see when to expect the submission.

Prerequisites

PPAP Development Gantt Chart Template

Phase 1: Design Documentation (Weeks 1–3)

Phase 2: Process Documentation (Weeks 2–5)

Phase 3: Part Production Run (Weeks 6–8)

Phase 4: Supplier and Material Documentation (Weeks 4–7)

Phase 5: Safety and Regulatory Documentation (Weeks 5–7)

Phase 6: Part Submission Warrant and Submission (Weeks 8–10)

Common Mistakes

1. Using prototype tooling parts for dimensional results. PPAP parts must be produced from production tooling, production equipment, and production process. Prototype or soft-tool parts are not acceptable for PPAP — even if the dimensions are identical. The customer is approving the production process, not the part geometry.

2. Not completing Gage R&R before the production run. If the measurement system isn't qualified (%R&R < 30% for general use, <10% for critical characteristics), your capability data may be driven by measurement variation, not process variation. Complete MSA first, then run capability.

3. Missing sub-tier supplier documentation. Your PPAP package is only as complete as your supply chain documentation. If your steel supplier doesn't have a material certification at the correct revision, your PPAP fails — not because of anything wrong with your process, but because of a missing document.

4. Signing the PSW before reviewing all elements. The Part Submission Warrant certifies that all elements are complete and conforming. Signing it before the complete internal review makes the quality manager personally responsible for any gaps the customer finds. Review every element before signing.

5. Submitting with Cpk below 1.67 without a deviation. If your initial capability doesn't meet the 1.67 target, you need customer approval of a conditional approval or deviation — not just a note in the submission. Conditional approvals come with action plans and timelines for achieving the target.

Quick-Start in gantt-chart.io

  1. Go to gantt-chart.io and create a project named "[Part Number] PPAP"
  2. Work backward from the customer's required PPAP approval date — typically 4–6 weeks before SOP
  3. Add the significant production run as the critical path anchor — everything in Phase 1 and 2 must complete before the run
  4. Add sub-supplier PPAP collection as a parallel workstream — it often takes the longest
  5. Share with the quality team and flag the PSW submission date in the project header

FAQ

What PPAP level should we submit?

The customer specifies the PPAP level in their supplier requirements manual or in the specific program requirements. Level 1 is PSW only. Level 3 is full package to the customer. Level 5 is full package reviewed at the supplier's facility. Never assume level — confirm in writing with the customer purchasing or quality engineer.

What's a significant production run?

AIAG requires a minimum of 300 consecutive parts at the normal production rate (not a slow sample rate) on production tooling and equipment. Some customers require more. Check the customer-specific requirements section of their supplier quality manual.

Can we ship initial parts to the customer before PPAP approval?

Only with a customer-authorized deviation or interim approval. Never ship without documented customer authorization. Shipping without approval exposes you to rejection, return shipping costs, and potential supplier quality status downgrade.

What happens if a dimension fails in dimensional results?

If a dimension fails and it's not a special characteristic, document the failure, identify the root cause, correct the process, and re-measure. If it's a special characteristic, you cannot submit a PPAP with a failing special characteristic without a customer-approved deviation.

How long does a PPAP submission review take?

Most automotive customers target a 15-business-day review cycle for Level 3 submissions. In practice, 3–6 weeks is common. Plan for a first-submission rejection and one resubmission cycle in your project timeline — the PPAP is approved when the customer says it is, not when you submit.

PPAP approval unlocks production. Build the PPAP timeline at gantt-chart.io, start sub-supplier documentation collection early, and submit a complete package — because a rejected first submission costs more than the time you saved by rushing it.