First Article Inspection (FAI) Guide: AS9100 and IATF 16949 Requirements

FAI is one of the most frequently misunderstood requirements in aerospace and automotive quality. Most rejections trace to the same five mistakes — here is how to avoid all of them.

What a First Article Inspection Actually Is

A first article inspection (FAI) is the documented, objective evidence — organized per AS9102B into 10 specific forms — that a production process is capable of producing parts conforming to all design requirements. The most common FAI rejection reason is not a dimensional failure; it is incomplete documentation: a missing material certification, an unsigned form, or characteristics on the drawing that were not ballooned and measured. A well-executed FAI proves both that the part conforms and that it was made by the documented production process.

A first article inspection is objective evidence, generated on a production-representative part, that your manufacturing process is capable of producing parts that conform to all design requirements. It is not a prototype inspection, not a sample inspection, and not a production readiness review — it is a systematic demonstration, documented to a defined standard, that the first output of a controlled production process meets every requirement of the engineering definition.

The most common misunderstanding about FAI is that it is primarily about the part. It is equally about the process. A first article inspection that measures every dimension on a drawing but does not verify that the part was made by the documented production process has not completed the FAI requirement.

When a First Article Inspection Is Required

AS9100 Rev D Clause 8.5.1 requires first article inspection as part of production control. The triggers for a full FAI are:

New part first production. Any part produced for the first time from a new design or new design release requires a complete FAI before delivery.

Engineering change. Any change to the engineering definition that affects form, fit, or function of the part. The scope of the FAI may be limited to the characteristics affected by the change (a delta or partial FAI), but the relevant characteristics must be reverified.

Process change. Any change to the manufacturing process, materials, tooling, or facility that could affect part characteristics. Moving production from one facility to another, changing to a new supplier for a critical material, or introducing new production equipment capable of affecting controlled characteristics all trigger a new FAI.

Lapse in production. Most customer-specific requirements specify a maximum production hiatus — typically one to two years — after which a new FAI is required. The rationale: tooling degrades, operators turn over, and process drift can occur during extended production gaps.

Customer requirement. Some customers require first article inspection for every contract or delivery order, regardless of whether the design or process has changed. Customer-specific requirements always take precedence.

AS9102B: The Standard That Defines the FAI Package

AS9102 Rev B is the aerospace standard that defines what a complete FAI package contains. For AS9100-certified suppliers, AS9102 compliance is expected by most OEMs, either through explicit contract reference or through customer-specific requirements.

AS9102B organizes the FAI package into ten forms, each addressing a different dimension of conformance.

Form 1 — Part Number Accountability. Documents the design definition used for the FAI, including drawing numbers, revision levels, and all referenced specifications. Confirms that the part being inspected is the part described by the referenced design definition.

Form 2 — Product Accountability. Documents the raw materials, purchased parts, and subcontracted processes used in the first article. Each material or component must be traceable to a material certification or supplier certificate of conformance.

Form 3 — Characteristic Accountability, Verification and Compatibility Evaluation. The primary measurement record of the FAI package. Every dimension, tolerance, and characteristic shown on the design drawing is listed, the actual measured value is recorded, and conformance is noted. Characteristics with no balloon number on the drawing should be assigned one.

Form 4 — Design Characteristic Accountability. For parts with design-controlled characteristics not captured on the standard drawing — such as process specifications referenced by note — this form documents compliance with those requirements.

Form 5 — Approved Design Changes Not Yet Incorporated. Documents any approved but not yet incorporated engineering changes applicable to the part, and confirms that these changes are addressed in the product or production plan.

Form 6 — Non-Conformances. Documents any characteristic on the first article that did not meet the design requirement. Non-conformances discovered during FAI must be dispositioned before the FAI is approved.

Form 7 — Statistical Process Control. Documents the SPC characteristics that will be monitored during production, baseline Cpk data, and control chart information.

Form 8 — Functional Test Results. Documents functional testing performed on the first article, including the test procedure revision, the acceptance criteria, and the test results.

Form 9 — Appearance Inspection Results. For parts with appearance requirements — color, surface texture, gloss, surface treatment — documents the acceptance criteria and inspection results.

Form 10 — Customer/Prime Contractor Supplied Parts. Documents any customer-furnished materials or components incorporated into the part.

Not every form is applicable to every part. The FAI package should include all applicable forms and mark non-applicable forms as N/A with justification.

Balloon Drawing Requirements

The balloon drawing is the visual companion to Form 3. It is a copy of the engineering drawing with every controlled characteristic identified by a numbered balloon — a circled number that corresponds to the characteristic number on Form 3.

A proper balloon drawing:

Common balloon drawing errors: missing callouts (characteristics on the drawing that were not ballooned because the inspector did not consider them controlled), inconsistent numbering, and balloons that cannot be traced back unambiguously to a specific dimension.

For complex parts with multiple sheets, each sheet should have its own set of balloons. The Form 3 should clearly indicate which sheet each balloon references.

Material Certifications and Traceability

Material traceability is one of the areas where aerospace FAIs are most frequently rejected. The requirement is not simply that you have a material certificate — it is that you can trace the specific raw material used to make the first article to a specific certificate of conformance from the material supplier.

The chain of traceability must connect:

1. The heat or lot number on the material certification

2. To the specific raw material stock used to make the part

3. To the finished first article part

If any link in that chain is broken — if the receiving record does not capture the lot number, or if the traveler does not document which material lot was used — the traceability requirement is not met regardless of whether valid certifications exist.

For parts requiring special process treatments (heat treatment, anodize, plating, NDT), the traceability requirement extends to special process certifications. Each special process certification must identify the specification and revision to which the process was performed, the facility that performed it (including any relevant customer approvals for that facility), and the lot or batch identifier linking it to the specific part.

Common FAI Rejections

Missing characteristics on Form 3. The most common rejection is simply not measuring everything on the drawing. Notes, general tolerances, and datum features are frequently omitted. Any characteristic defined on the drawing that affects form, fit, or function should appear on the Form 3.

Out-of-tolerance characteristics without disposition. A first article with a measured characteristic outside the tolerance that is listed as "conforming" in the FAI package. This occurs when the inspector records the actual value but checks the conform box without comparison to the tolerance. It also occurs when previous-revision tolerance values are used in the comparison.

Non-production process. The first article was made using a process that does not match the documented production process. Development tooling used instead of production tooling, prototype materials used instead of the approved production material, or special processes performed by unqualified operators.

Incomplete special process certs. Certifications that do not reference the applicable specification revision, do not identify the approved facility, or cannot be traced to the specific part by lot or batch identifier.

Unsigned or unauthorized forms. FAI forms must be signed by authorized personnel. In many customer requirements, the authorized signatories are specified — the FAI coordinator, an independent inspector, and sometimes customer representation. Missing or unauthorized signatures are a documentation rejection.

PPAP vs. FAI: IATF 16949 and AS9100 Comparison

The automotive and aerospace sectors use different frameworks for first-production verification, and understanding the distinction matters for suppliers serving both sectors.

Production Part Approval Process (PPAP) under IATF 16949 is the automotive equivalent. PPAP is broader in scope than AS9102 FAI — it includes process documentation (flow diagrams, control plans, PFMEAs) and process capability data in addition to part measurement. PPAP also defines five submission levels that determine what must be submitted to the customer versus retained internally.

AS9102 FAI is more focused on design conformance — demonstrating that the part as produced matches the engineering definition. Process documentation requirements are lighter than PPAP, but the part measurement requirements are typically more comprehensive.

Suppliers serving both sectors must maintain familiarity with both frameworks. The underlying purpose is the same — verify that the production process produces conforming parts before full-rate delivery — but the documentation requirements, forms, and terminology differ significantly.

If a customer requires both PPAP and FAI for the same part (unusual but not unheard of in hybrid aerospace-automotive supply chains), the two packages can share underlying data — material certifications, dimensional measurements, and functional test records — but each must be presented in the required format for its respective standard.

Coplain helps aerospace and automotive suppliers build complete, accurate FAI and PPAP packages. Try it free at coplain.com.

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