PCB First Article Inspection Services

What Is First Article Inspection?

First Article Inspection (FAI) is a PCB inspection process used to ensure that a representative production item meets the specifications outlined in the approved product design, as well as the manufacturing conditions that will be used for future production units.

How Do FAI and FAIR Differ?

The primary difference between the two terms is that FAI is an inspection activity, while FAIR refers to the documentation produced as a result of FAI. During FAI, engineers identify the product’s accountable characteristics, use the planned inspection and test methods, manufacture a production item under the intended production conditions, and document the results. A first article is the production-representative item manufactured as part of this verification activity, not a prototype developed using another method.

The FAIR serves as the controlled record for the verification activity. It identifies the product and revision, links each accountable characteristic to its respective requirement and result, and documents the supporting material and process evidence associated with producing the first article. Each FAIR also includes the required verification, organizational approval, and customer approval fields.

What Does FAI Verify?

FAI verifies that the first article conforms to the approved requirements and that the intended manufacturing conditions can produce that result. Conformance to a validated dimension is not enough; the wrong material, program revision, or manufacturing process route is also unacceptable.

For bare printed circuit boards (PCBs) or finished printed circuit board assemblies (PCBAs), evidence of conformance typically includes revisions, bills of material (BOMs), component identities and orientations, solder-paste condition, placement, visible features and hidden connections, electrical connectivity, programmed configuration, and defined functional behavior. Finding a discrepancy allows corrective action before the remaining lot is produced.

How Does FAI Establish the Production Baseline?

A first article that conforms to the approved requirements becomes the production baseline for future units. A baseline does not consist only of a passing board; it also includes the approved product revision, materials, programs, tooling, process settings, inspection methods, test requirements and results, and approval status that validate the result.

Subsequent units still require process control, traceability, inspection, and change management. If a design, material, source, location, program, tooling, process, or production condition changes, the team determines whether the approved baseline remains valid or whether the affected characteristics require renewed verification.

Production Baseline Process

FAI involves four interdependent stages: prepare a technical baseline, build a production-representative item, perform the planned inspections and testing, then correct any failure and obtain the required approvals.

Which Technical Data Defines the FAI?

The FAI plan takes the current approved drawing or digital product definition (DPD), Bill of Materials (BOM), CAD data, material and process specifications, hardware revision, software revision, and acceptance limits and converts them into accountable characteristics, measurement methods, equipment, and assigned responsibilities.

A current drawing paired with an old BOM, placement program, firmware or bootloader, or test program does not describe a single controlled product. Dimensional requirements need capable measurement methods; material and special-process requirements need applicable records; electrical and functional requirements need controlled procedures and acceptance limits. The plan also assigns responsibility for any nonconforming result.

What Must the Customer Provide Before FAI?

Before first-article manufacture, SUGA confirms receipt of the released drawing or digital product definition and revision, BOM and AVL, fabrication and assembly data, approved substitutions, firmware or bootloader files, programmable-device data, inspection and functional-test procedures, acceptance limits, sample quantity, FAIR format, and contract quality clauses. The customer must also identify the approval authority and whether approval permits continued production, shipment, or both.

Open conflicts must be resolved before the first article enters the controlled route. Examples include a drawing revision that does not match the BOM or test program, undefined functional acceptance limits, missing authorization for an alternate component, or a sample plan that does not provide sufficient samples for destructive testing. A technically acceptable board may produce a FAIR, but the FAIR cannot be approved without sufficient supporting evidence.

Production-Representative Manufacturing

The first article must be built using the materials, programs, tooling, equipment, and process settings intended for subsequent production. A hand-built prototype, substitute material, temporary tooling, or different test route establishes a different production baseline.

For PCB assembly, the recorded configuration can include the stencil, solder paste, placement program, thermal profile, assembly program, hardware revision, and programmed configuration. Any departure from the planned route must be resolved before the results can support future production because the evidence must reflect the conditions under which the article was built.

How Is the Inspection Plan Executed?

Each inspector applies the specified technique and acceptance limit to every planned characteristic. Inspectors document actual values when quantitative verification is required and may document attribute results only when the requirement and method permit them. Checks may include visual, dimensional, material, electrical, functional, and product-specific checks. Each type of check answers a different question.

Calibrated dimensional and optical equipment verifies geometry and visible features. Electrical checks verify continuity, connectivity, or defined circuit behavior. Functional testing verifies performance within the stated operating range by checking inputs, loads, interfaces, timing, firmware, and responses. Results are linked to the characteristic ID, board identity, method, and equipment or procedure reference.

Corrective Action and Final Approval

Any failed characteristic places approval of the affected range on hold. Quality records the nonconformance and proposed disposition, while engineering determines whether the cause lies in the design, material, tooling, program, equipment, process, or test method.

Once a correction is made, the affected and related characteristics are reinspected under the applicable Full or Partial FAI. A contractually accepted deviation requires design and customer approval. The NCR alone is not sufficient to release production. Approval is complete only when the results, disposition or correction, reinspection, organizational verification, and customer decision are complete for the stated range. Once approved, the FAIR becomes the baseline for future production and change decisions.

FAIR Standards

The current published aerospace first article inspection revision is AS9102C. SUGA prepares the FAI plan and FAIR to AS9102C or to the revision explicitly stated in the customer contract. AS9100D, ISO 9001:2015 with Amendment 1:2024, and ISO 13485:2016 establish quality-system controls; however, they do not replace FAI requirements defined by contract.

Which AS9102 Revision Applies?

The applicable AS9102 revision is established by the contract. The contract also defines any additional forms, characteristic classes, sampling rules, digital-product-definition requirements, source inspection, submission format, and approval steps. SUGA documents these conditions and the named approval authority before manufacturing the first article.

Drawing notes, purchase-order requirements, statutory controls, and the project quality plan are included in the requirement set. The customer specifies whether approval is required before continued production, shipment, or both.

Quality-System Controls

ISO 9001 and AS9100D confirm that production is managed through a certified quality system. However, a certified quality system audits process discipline, not whether a specific first article matches the approved product definition. A supplier can hold current certification and still produce a FAIR under an incorrect BOM revision. The certified quality system does not define the FAIR forms, inspection range, sampling, or approval authority. Only the contract’s FAI flow-down defines these requirements.

Medical FAI Controls

Process validation supports confidence in the manufacturing process. FAI records document whether a production-representative article meets its defined characteristics and configuration. Both process validation and FAI records may be required, but one does not replace the other.

Full vs. Partial FAI

Use Full FAI when the project requires a new baseline. Use Partial FAI when a documented change affects a defined set of characteristics and the remaining approved FAIR remains valid. Detail part, subassembly, and final assembly describe product-accountability levels, not different FAI range types. A temporary or unresolved condition is an open status, not a separate range.

Full FAI

“Full” describes complete characteristic accountability at the applicable product level; it does not prescribe one universal number of physical samples.

Partial FAI Characteristics

The engineering task is to evaluate the indirect effects of changes. These effects may be caused by a material, source, location, tool, program, equipment, process, or embedded-software change. Earlier results remain valid only when the supporting requirement and production condition are unchanged.

For example, replacing a voltage regulator with an approved alternate does not limit Partial FAI to checking the new part number. An impact review may include pad compatibility, polarity, stencil aperture and paste response, neighboring placement, thermal behavior, programmed settings, power-rail limits, and affected functional-test results. Only characteristics supported by unchanged requirements and production conditions remain linked to the earlier FAIR.

Characteristic Ownership

Product level and FAI range are separate decisions. A detail part, subassembly, or final assembly can require either Full or Partial FAI. Assigning each characteristic to one owning level avoids duplicate inspection, while the assembly index preserves the applicable lower-level FAIR Identifiers and assembly-specific results.

Purchased commercial items, modified catalogue items, materials, processes, and software remain in the evidence location required by the approved product definition and customer requirements. A deviation, missing record, or nonconforming characteristic remains open until correction and reinspection are complete or a contractually valid disposition is approved.

Production Approval Methods

FAI, PPAP, and first-piece inspection can coexist. Each method supports a different approval decision, and the contract and customer-specific requirements define which record governs the project.

When Does Automotive Approval Require PPAP?

While First Article Inspection and first-production evidence support a PPAP submission, they do not replace customer-required elements such as the process flow, PFMEA, control plan, measurement-system evidence, capability results, material or performance records, and the applicable submission warrant. The contract and customer-specific PPAP level determine whether FAI, PPAP, or both are required.

How Does First-Piece Inspection Differ?

FAI establishes or re-establishes the approved production baseline, while first-piece inspection confirms selected setup and product features after line restarts, program loads, changeovers, or similar production starts. First-piece inspection may catch setup errors before they continue through production, but it does not replace a contract-required FAIR.