KEY TAKEAWAYS

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PPAP is an automotive-lineage process defined by AIAG; FAI is an aerospace-lineage process defined by AS9102. Know which standard your customer or program requires.

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FAI is mandatory for AS9100-registered programs and new or changed aerospace part numbers — it is not optional.

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PPAP has five submission levels; only Level 3 requires a full package. Specify the level explicitly in your purchase order.

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Both processes validate the production process, not just the part — dimensional conformance alone is insufficient for either.

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When using a managed sourcing partner like Nimble, confirm upfront which deliverable is required so documentation is built into the quote and schedule.

Both PPAP and FAI answer the same core question: does your production process reliably yield conforming parts? The divergence is historical. PPAP — Production Part Approval Process — was codified by the Automotive Industry Action Group (AIAG) in the 1980s to standardize supplier qualification across GM, Ford, and Chrysler. FAI — First Article Inspection — evolved separately within aerospace, ultimately standardized as AS9102 (now AS9102B) under the SAE/IAQG framework. Each standard reflects the risk tolerance and regulatory environment of its home industry. Automotive production runs millions of units; statistical process control and measurement system analysis are central to PPAP because small process shifts have enormous downstream consequences. Aerospace programs may run dozens or hundreds of units; AS9102 emphasizes complete design characteristic verification and traceability to engineering drawings rather than statistical sampling. The practical result: if your end customer is a Tier 1 automotive supplier, expect PPAP. If your customer is a prime aerospace contractor or DoD program office, expect FAI per AS9102. Many defense-adjacent and industrial programs borrow language from both, which is where the confusion compounds.

Rule of thumb: If your drawing references an AS9100 quality system or calls out a cage code and part number, assume FAI (AS9102) is required until told otherwise.

PPAP is organized into 18 elements and 5 submission levels. The elements include design records, engineering change documentation, a process FMEA, a control plan, measurement system analysis (MSA/Gage R&R), dimensional results, material and performance test results, initial process capability studies (Cpk), sample production parts, and a Part Submission Warrant (PSW), among others. Not every program requires all 18 elements — the submission level governs what physically changes hands between supplier and customer.

• Level 1: PSW only (with appearance approval if applicable)
• Level 2: PSW plus limited supporting data and samples
• Level 3: PSW plus complete supporting data and samples — the default level
• Level 4: PSW plus other requirements defined by the customer
• Level 5: PSW plus complete data reviewed at the supplier facility

Level 3 is the most common and the one you should default to unless your customer explicitly states otherwise. The Cpk requirement — typically a minimum of 1.67 for critical characteristics during PPAP, falling to 1.33 in steady-state production — is frequently the hardest element to satisfy on tight-tolerance machined parts. Plan your process capability studies before you cut first article parts.

Warning: A signed PSW without supporting capability data is not a completed PPAP. Customers who accept a bare PSW at launch often raise non-conformances during supplier audits. Build the full package from day one.

AS9102B structures a First Article Inspection around three core forms, each capturing a distinct category of objective evidence. Form 1 documents the design characteristic accountability — every characteristic called out on the engineering drawing or model must be listed, measured, and reported with actual values. There is no sampling; every dimension, tolerance, surface finish callout, and geometric control must be accounted for. Form 2 covers material and test results, including raw material certifications, special process certifications (heat treat, anodize, plating), and any functional or environmental test data required by the drawing notes. Form 3 addresses manufacturing process accountability — the list of operations, work instructions, tooling, and special process approvals that define how the part is made. The intent is explicit: the FAI package must demonstrate that the process used to make the first article is the same process that will make every subsequent unit. Changes to material, machine, fixturing, facility, or process after a completed FAI typically trigger a partial or full FAI repeat. This is not bureaucratic overhead — it is the mechanism by which aerospace programs maintain configuration control across a supply chain that may span years and multiple production lots.

Key insight: AS9102B requires a FAI on the first production part from a new part number, a new supplier, or after any change to design, process, or facility that could affect form, fit, or function. When in doubt, trigger a partial FAI.

At their core, both processes require dimensional inspection against the engineering drawing, material traceability, and evidence that the production process — not just the prototype — produced the part. That is where the similarity largely ends. Scope of dimensional reporting: PPAP typically requires a balloon-annotated drawing with actual measurements for a defined sample size; AS9102B Form 1 requires every design characteristic to be reported with actuals, with no skip-lot or sampling exemptions for the FAI unit itself. Statistical process data: PPAP requires Cpk studies on critical characteristics; AS9102B has no equivalent Cpk mandate, though the customer may impose one contractually. Process documentation: PPAP requires a formal control plan and process FMEA; AS9102B Form 3 requires process accountability but does not mandate an FMEA by name. Retention and re-triggering: PPAP approval status is generally stable once granted; FAI must be repeated for any drawing revision level change, supplier change, or manufacturing process change. Who approves it: PPAP approval comes from the customer quality organization; FAI acceptance may come from the customer, a delegated inspection authority, or a government quality representative (QAR) on defense contracts. If your program has any government contract involvement, verify early whether a QAR witness is required.

One area where both PPAP and FAI demand significant supply chain coordination is special processes — heat treatment, chemical conversion coating, anodizing, plating, non-destructive testing, and similar operations. For FAI, AS9102B Form 2 requires objective evidence that each special process was performed by a qualified source. In aerospace, that often means the processor must hold a Nadcap accreditation or appear on the customer’s approved supplier list (ASL). A machine shop can produce a dimensionally perfect part; if the anodize was done by an unqualified processor, the FAI is incomplete. For PPAP, material and performance test results covering special processes are captured in Element 11 of the 18-element package. The certification chain — raw material mill cert, special process cert, finishing cert — must be present and traceable to the production lot. This is frequently where PPAP packages fall short on first submission. Proactively collecting certs from sub-tier suppliers before you build the package saves significant rework. When working through a managed sourcing partner, confirm that the partner’s certified network includes qualified special process providers relevant to your part’s finishing requirements. Nimble’s certified partner network covers the full production and finishing sequence, which means FAI and PPAP documentation flows through a single managed relationship rather than requiring the buyer to chase certs across multiple sub-tier vendors.

Warning: Nadcap accreditation is not universal. If your drawing calls out a Nadcap-required process (common on turbine engine and airframe components), verify processor qualification before PO issuance — not after.

Some programs sit at the intersection of industries and contractually require elements of both PPAP and FAI. Defense programs sourced through automotive-adjacent supply chains, or industrial OEM programs with AS9100-registered suppliers, sometimes specify a hybrid deliverable. Read your contract and purchase order quality clauses carefully — they take precedence over your assumptions about industry norms. A clause referencing AS9102 means FAI. A clause referencing AIAG PPAP or specifying a Part Submission Warrant means PPAP. If both are referenced, you are building both packages. On the other end of the spectrum, some commercial and industrial programs require neither. A customer purchasing prototype machined parts for an internal R&D program has no regulatory obligation to invoke either standard. In this case, a dimensional inspection report with CMM data and material certs may be entirely sufficient. Do not gold-plate your deliverable. Invoking PPAP or FAI on a program that does not require it adds cost and schedule without adding customer value. The right question is not ‘which is better’ — it is ‘what does the contract actually require, and what does the program risk profile justify.’ Build your quality plan to that standard, document it, and execute it consistently.

Key insight: If your purchase order is silent on first-article requirements but your part is safety-critical or flight-hardware, push back and get explicit written direction from your customer. Assumptions cost programs.

Regardless of which standard applies, the groundwork for a successful first article starts at design release — not after the first parts come off the machine. Balloon your drawing before machining begins. Every dimension, GD&T callout, surface finish requirement, and note needs a unique identifier so the inspection report can reference it unambiguously. A balloon drawing prepared by the manufacturing team often catches drawing ambiguities that the design team missed. Define your measurement approach early. For tight-tolerance features, know whether you need CMM data, optical measurement, surface profilometry, or functional gauging. CMM inspection is standard practice for both PPAP and AS9102B compliance — Nimble includes CMM inspection in its standard quoting process, which means first-article dimensional data is not an add-on cost to negotiate. Lock your process before you run first article parts. If you change your fixturing, tooling, or cutting parameters after the FAI or PPAP parts are produced, you may need to re-run. Document the exact process state — machine, tooling, offsets, programs, operator, date — at the time of first article production. Build your documentation package in parallel with machining, not after. Waiting until parts are complete to start chasing material certs and process certifications creates schedule risk. A well-managed first article run treats documentation as a parallel deliverable, not an afterthought.

First article programs expose supplier capability faster than any other project type. The combination of dimensional precision, documentation discipline, and process control required by PPAP and AS9102B separates suppliers who have repeatable systems from those who are improvising. When evaluating a manufacturing source for a program that requires PPAP or FAI, ask these questions directly: Does the facility operate under a certified quality management system — AS9100 for aerospace programs, ISO 9001 at minimum for PPAP? Can they produce a balloon drawing and CMM report as standard deliverables? Do they have documented control plans and in-process inspection checkpoints, or is end-of-line inspection the only quality gate? Are special process vendors already qualified and on an approved supplier list, or will each one require customer approval? For programs where getting to production quickly matters, a managed sourcing model can compress first-article timelines significantly. Rather than qualifying a single machine shop and then separately locating finishing, plating, and NDT providers, a network-based sourcing partner handles the full scope under one quality umbrella. Nimble’s certified partner network operates under AS9100, ISO 9001, and ITAR registration, with integrated CMM inspection and DFM review built into the quoting process — the infrastructure for a compliant first article is already in place before the program starts.

Rule of thumb: If your supplier cannot produce a balloon drawing and CMM report without being asked, they are not set up for PPAP or FAI work. Move on.

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