First Article Inspection: A Practical Guide for UK Manufacturers

What First Article Inspection Is

First article inspection (FAI) is the formal process of verifying that the first unit produced from a new production setup — or from a changed production setup — fully conforms to all engineering and customer requirements before the production run continues.

The purpose is straightforward: before committing to a production batch, confirm that the process, tooling, materials, and operator can consistently produce a part that meets every requirement on the drawing and specification. An FAI is the verification gate between setup and production.

In UK manufacturing, FAI is most commonly required in three situations:

New part introduction — the first time a new component or assembly is manufactured
Changed process or tooling — after a significant change to materials, suppliers, manufacturing sequence, tooling, or equipment that could affect product characteristics
Production restart after a long break — when production of a part resumes after a significant gap (definition varies by customer and sector, but six months or more is common)

Different sectors use the term differently. In aerospace, "FAI" typically refers to the formal First Article Inspection Report (FAIR) process defined by standards such as AS9102 (the SAE International standard for aerospace FAIR documentation). In automotive, the equivalent is the Production Part Approval Process (PPAP). In general manufacturing to ISO 9001:2015, neither AS9102 nor PPAP is mandated — but the principle they embody (verify the first article before committing to production) maps directly to ISO 9001:2015 clause 8.6.

What ISO 9001:2015 Requires for Product Release

ISO 9001:2015 clause 8.6 ("Release of products and services") requires that organisations have planned arrangements for verifying that product and service requirements have been met. The clause requires that products are not released until these arrangements have been satisfactorily completed, and that evidence of conformity with acceptance criteria is retained, along with traceability to the person who authorised release.

First article inspection is the most common way manufacturing organisations implement clause 8.6 for new or changed products. An FAI provides documented evidence that:

The first piece produced from the new setup meets all drawing and specification requirements
The evidence has been reviewed and authorised by an appropriate person
The approval to proceed with production is traceable

Without this documented evidence, a UKAS-accredited certification body auditor reviewing your product release records has no basis to verify that clause 8.6 was followed for new product introductions. The gap typically appears in two scenarios: a new part was introduced informally (the process "just worked"), or a significant process change was made without formal FAI, and the next external audit is the first time the gap is noticed.

What an FAI Should Cover

The scope of an FAI depends on whether customer specifications mandate a formal FAIR (as in aerospace) or whether you are applying ISO 9001:2015 clause 8.6 requirements in general manufacturing. The following covers the ISO 9001-aligned baseline that UKAS-accredited auditors expect.

Dimensional verification

Measure all critical and major dimensions on the engineering drawing and record actual values alongside nominal values and tolerances. "Within tolerance" is not sufficient — record the actual measurement, the nominal, and the tolerance band so the record demonstrates objective evidence of conformity rather than a subjective assessment.

Which dimensions to measure:

All dimensions with specific tolerances on the drawing
Key characteristics (KCs) defined by the customer or engineering team
Functional dimensions that affect mating, assembly, or performance

Material verification

Confirm that the material used conforms to the specification:

Material type and grade (to drawing, specification, or purchase order requirements)
Certificate of conformity from the supplier
If the material spec includes hardness, conductivity, or surface finish, record test values

Process parameter verification

Confirm that the process parameters used for the first article are those intended for production:

Tool offsets set to intended values (not trial-and-error)
Feed rates, speeds, pressures, temperatures at production settings
Any special process parameters (heat treatment, plating, coating) at specified conditions

For CNC machining: record the program number and revision used. If a tool offset was adjusted during first article, document the final offset and confirm it is locked for production.

Surface finish

Measure and record surface roughness where specified on the drawing. Record actual Ra (or Rz) values against specified maximums.

Visual inspection

Inspect for surface defects, burrs, sharp edges, or handling damage. Record any observations. The visual inspection record must state who inspected, what criteria they applied, and what was found — not just "visual OK."

Functional or assembly check

Where the drawing indicates a mating condition, assembly relationship, or functional requirement, verify it. A plug gauge for a bore, an assembly fixture check, or an articulation test. Record the method, the criteria, and the result.

Customer-specific requirements

If the customer has issued supplementary requirements (customer engineering standards, form-specific requirements, Cpk targets), check and record these separately. Customer-specific requirements often appear in customer purchase orders or advance quality planning documents, not on the drawing itself.

The FAI Record

The FAI record is the documented evidence that the inspection was conducted and the outcome. For ISO 9001:2015 compliance, it must include:

Part identification — drawing number, revision, part number, description
Production setup identification — machine, tooling, program, operator
Date of FAI
Inspection results — measurements, pass/fail against each requirement
Material and process evidence — certificate references, parameter records
Inspector name and role
Approval — named individual authorising release to production, with date
Any deviations — dimensions out of tolerance, observations, and how they were dispositioned (rework, concession, or re-setup)

The record does not need to follow a specific form layout under ISO 9001:2015 — but it must contain this information and be retained as documented information (clause 8.6 and clause 7.5).

When FAI Reveals a Problem

If the first article fails one or more requirements, the options are:

Re-setup and re-inspect — adjust tooling, fixtures, or parameters and run a new first article. The failed first article is documented; the accepted first article is the one that authorises production. Both records are retained.

Raise a non-conformance — if the first article failure indicates a design issue (drawing requirement is not achievable with the current process), raise a non-conformance report and consider whether an engineering change request is needed to modify the drawing.

Customer concession — if the out-of-tolerance condition is not functionally significant, a formal concession from the customer (written approval to use-as-is) allows production to proceed. The concession must be documented and retained.

What you cannot do is proceed with production on a failed first article without resolution and documentation. A batch produced after a failed FAI with no documented resolution is a systematic quality gap — the kind that creates significant corrective action findings at audit.

FAI and Your Engineering Change Process

First article inspection connects directly to your engineering change management process. Any time a change to a part or process is approved through your change control procedure and a new Engineering Change Order (ECO) is issued, the implementation of that ECO typically triggers a first article requirement before production restarts.

This connection matters for two reasons:

Audit traceability. An auditor reviewing an ECO will follow the implementation trail: was the change implemented as authorised? Did the change trigger a first article inspection (as required by your procedure)? Is the FAI record present? Is production on record as starting after the approved FAI?

Corrective action loops. If a non-conformance triggered an engineering change via a corrective action, the FAI on the changed part is part of the effectiveness verification. The corrective action is not verified effective until the changed part has been produced and inspected — and found conforming.

The practical implication: your change control procedure should explicitly state when FAI is required (typically: new parts, changed drawings, changed process parameters, changed suppliers for critical materials, production restarts after defined break). If your procedure does not address FAI triggers, UKAS auditors will ask how you determine whether a first article inspection is needed for a given change.

Setting Up a Simple FAI Process for an SME

A manufacturing SME with 20-50 employees does not need a complex FAI procedure. The minimum viable process:

Define when FAI is required. Document the triggers: new part number, revised drawing, changed process, production restart after 6 months. Your change control procedure is the right place for this list.
Create a standard FAI record form. One page or two: part identification, setup details, dimensional results table, material/process evidence, inspector sign-off, approval sign-off. It does not need to be the same format as AS9102 unless your customers require it.
Require sign-off before production. The FAI record must be approved before the production batch starts. Name the person who has authority to approve FAI: typically the quality manager or a quality engineer.
File FAI records with the part record. FAI records are retained as documented information (clause 8.6). Store them where a future auditor — or your own team — can find them by part number and revision.

Link FAI to ECOs. When an ECO is issued for a part, the implementation checklist should include a line: "FAI required? Y/N. If Y, FAI approved before production? Y/N. FAI record reference: ___."

This process can be run on paper or spreadsheet. What matters is consistency — the process is followed for every relevant trigger, and the records exist.

This guide describes the product release verification requirements of ISO 9001:2015 clause 8.6. The full standard is available from ISO. For aerospace FAI requirements under AS9102, consult SAE International. This guide is a practical reference — verify requirements with the standard and your UKAS-accredited certification body.

Sources

ISO 9001:2015 — Quality management systems — Requirements. Available from ISO.
ISO/TC 176 — the ISO Technical Committee responsible for ISO 9001: iso.org/committee/53882
SAE International — publisher of AS9102 (Aerospace First Article Inspection Requirement): sae.org
UKAS — United Kingdom Accreditation Service, the national accreditation body for the United Kingdom.

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