Key takeaways
Short answer: First Article Inspection (FAI) and PPAP both prove a part is acceptable before production, but at different scopes. FAI verifies that a sample part meets every requirement on the drawing — every dimension, material, and note checked and recorded. PPAP (Production Part Approval Process) is a broader, AIAG-defined package that proves the production process itself can make conforming parts repeatably — it includes the FAI-style dimensional results plus process flow, PFMEA, control plan, capability studies, and more. FAI is about the part; PPAP is about the process. In practice, FAI is usually one element within a PPAP submission.
First Article Inspection (FAI) is a documented verification that a representative part — the "first article" — meets every requirement on its drawing and specification. An inspector takes a sample part from the production process and measures and records every characteristic: each dimension against its tolerance, the material against the spec, every note and callout on the drawing, finishes, threads, and special processes. The result is a formal report (in aerospace, the AS9102 form set) that shows, characteristic by characteristic, that the part conforms. FAI is fundamentally part-focused: its question is "does this actual part match the drawing in every respect?" It is triggered by a new part, a design change, a new manufacturing location or process, or a long break in production — anything that could change whether the part conforms. FAI proves that the part, as made, is right. It is a powerful catch for drawing-interpretation errors and setup mistakes, because it forces someone to verify every single requirement rather than just the few that get routinely checked.
PPAP — the Production Part Approval Process — is broader. Originating in the automotive industry (AIAG), it is a standardized package of evidence that proves a supplier's production process can make parts that consistently meet all requirements, at production volume and rate. A full PPAP submission can include up to eighteen elements: the design records, an engineering-change document, process flow diagram, PFMEA, control plan, measurement-system analysis (MSA), dimensional results, material and performance test results, initial process-capability studies, a sample part, and the part-submission warrant (PSW) that ties it together. The dimensional-results element is essentially FAI-style data — but it is only one piece. PPAP is process-focused: its question is not just "is this part right?" but "have you demonstrated that your process is set up, controlled, capable, and documented well enough to keep making right parts?" That is why PPAP includes capability studies and control plans that FAI alone does not.
The core difference is scope: FAI verifies the part; PPAP verifies the process that makes the part. FAI answers a focused question — does this sample conform to every drawing requirement? — and answers it thoroughly. PPAP answers a bigger one — can this production process reliably produce conforming parts at volume, and have you proven it with the full evidence package? You can pass an FAI on a part that happened to come out right from a process that is not yet capable or controlled; PPAP exists precisely to close that gap by requiring capability data, control plans, and failure-mode analysis on top of the dimensional proof. Put another way: FAI is a snapshot of one good part; PPAP is the case file arguing the process will keep producing good parts. This is why FAI alone is common in low-volume, build-to-print industries like aerospace, while PPAP is the norm in high-volume automotive where process repeatability is everything.
FAI and PPAP are not really competitors — they overlap and often nest. In a PPAP submission, the dimensional-results element is the FAI: the same characteristic-by-characteristic verification that the part meets the drawing. So doing a PPAP generally means you have also done an FAI as one of its elements. The reverse is not true: an FAI on its own does not include the process flow, PFMEA, control plan, or capability studies that make up the rest of PPAP. Industry context decides which you encounter. Aerospace and defense, governed by AS9102, lean on standalone FAI (with its own first-article rigor) and may not use AIAG PPAP at all. Automotive uses PPAP as the gate for production approval, with FAI-style dimensional results embedded inside it. Knowing the relationship prevents a common confusion: a supplier asked for "an FAI" in an automotive context may actually be expected to deliver a full PPAP, of which FAI is just one part.
A supplier is approved to make a new steel bracket with 60 drawing characteristics. For FAI, they take one production sample and measure all 60 characteristics; every one falls within tolerance, the material certificate matches the spec, and all notes are verified. The AS9102 report shows 60 of 60 conforming — the part is right. For PPAP, that dimensional report becomes one element, but the supplier must also submit more: a 30-piece capability study on the three critical characteristics showing Ppk above the required threshold (say 1.67), a process flow diagram, a PFMEA identifying how the process could produce a bad bracket and the controls that prevent it, a control plan, and measurement-system analysis proving the gauges are capable. The FAI proved one bracket conformed; the PPAP proved the process is capable of making conforming brackets at rate and is controlled to keep doing so. Same part, two very different depths of evidence — one part verified versus a whole process qualified.
Choose by industry, volume, and what is being approved. Use FAI when you are in an aerospace, defense, or low-volume build-to-print environment governed by AS9102, when a design or process change needs re-verification, or when you simply need to prove a specific part conforms to its drawing. Use PPAP when you are in automotive or another high-volume industry that requires production-approval evidence, when a customer's purchase order or quality agreement calls for it, or whenever the question is "can your process make these repeatably?" rather than "is this one right?" In practice many suppliers do both because PPAP contains FAI. The decision is rarely yours alone — the customer's quality requirements usually dictate which package is required — but understanding the difference lets you scope the work correctly and avoid under-delivering (sending an FAI when a PPAP was required) or over-delivering (building a full PPAP when a standalone FAI was all that was asked).
A properly approved, capable process protects the Quality factor of OEE from the very first production run. FAI catches the part-level errors — a misread tolerance, a wrong setup — that would otherwise generate defect losses immediately. PPAP goes further by proving process capability up front, which means fewer defects once volume production starts, protecting both Quality and the Availability that defect-driven stoppages and rework would erode. The capability indices in a PPAP (Cpk and Ppk) are direct predictors of the defect rate the process will run at — and therefore of the Quality factor you can expect. Strong measurement-system analysis (see repeatability and reproducibility) ensures the quality data feeding your OEE is trustworthy in the first place. Skipping this front-end rigor shows up later as chronic quality losses that are far more expensive to chase than they would have been to prevent.
Once a part is approved and in production, Fabrico tracks whether the process actually delivers the quality the approval promised — capturing defect and rework losses against live OEE so you can see if real-world Quality matches the capability the PPAP claimed. When the production defect rate drifts from the approved baseline, the OEE Quality trend shows it early, pointing to a process that has moved off its qualified state. Book a demo to connect approval-stage capability to real production quality.
FAI verifies that a sample part meets every requirement on the drawing. PPAP is a broader package proving the production process can make conforming parts repeatably. FAI is about the part; PPAP is about the process and includes FAI-style dimensional results as one of its elements.
Yes. The dimensional-results element of a PPAP submission is essentially an FAI — the characteristic-by-characteristic verification that the part meets the drawing. PPAP adds process flow, PFMEA, control plan, capability studies, and more on top of it.
Aerospace and defense use FAI under AS9102, often as a standalone deliverable. Automotive uses PPAP under AIAG as the production-approval gate, with FAI-style dimensional results embedded inside it. The customer's quality requirements dictate which is needed.
Yes. A proper First Article Inspection verifies every characteristic on the drawing — every dimension, material requirement, note, and special process — not just the critical few. That completeness is what makes it effective at catching setup and drawing-interpretation errors.
Because PPAP proves the process can make conforming parts repeatably, not just that one part is right. Capability studies (Cpk/Ppk) quantify how reliably the process stays within tolerance, which a single FAI part cannot show.
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