First Article Inspection (FAI): Complete Guide for CNC Machined Parts

First Article Inspection, commonly shortened to FAI, is one of the most important quality-control steps when a CNC machined part moves from drawing release into production.

Its purpose is not simply to measure the first component that comes off a machine.

A properly executed FAI provides documented evidence that a production-representative part has been manufactured and verified against the applicable engineering requirements, including dimensions, GD&T, material, specified processes, surface requirements, and other characteristics defined by the drawing or purchase documentation.

For buyers and engineers, FAI reduces the risk of discovering drawing interpretation errors, process problems, missing requirements, or documentation gaps after a full production batch has already been manufactured.

For the CNC supplier, it establishes a verified baseline before routine production continues.

At NAITE TECH, First Article Inspection is integrated into our broader CNC machining and quality control and inspection workflow. The scope of each FAI is determined by the drawing, customer requirements, production risk, and applicable quality standard rather than by applying the same inspection package to every project.

What Is First Article Inspection (FAI)?

First Article Inspection is a documented verification process used to confirm that a production-representative part and the process used to manufacture it satisfy the applicable product requirements.

For CNC machining, those requirements may include:

• Dimensional tolerances

• GD&T

• Material specification

• Heat treatment

• Surface finish

• Coating or plating

• Thread requirements

• Drawing notes

• Special processes

• Functional requirements

• Customer-specific documentation

The result is normally recorded in a First Article Inspection Report, often abbreviated as FAIR.

In aerospace, space, and defense supply chains, AS9102C provides a standardized framework for performing and documenting FAI when that standard is contractually required. SAE lists AS9102C as the current revision, revised June 28, 2023.

FAI Is More Than Measuring the First Part

The phrase “first article” can make FAI sound like a simple first-piece dimensional check.

That interpretation is incomplete.

A formal FAI is concerned with both the product and the production process that created the product.

For example, a machined aluminum housing may measure correctly, but an FAI package can still be incomplete if:

• The wrong drawing revision was used.

• The material certificate does not match the specified alloy or temper.

• A drawing note was not verified.

• A required coating certificate is missing.

• A GD&T characteristic is absent from the report.

• The inspected component was produced using a temporary process that does not represent intended production.

A dimensionally acceptable part is therefore only one part of a successful FAI.

What Does an FAI Actually Prove?

A well-executed FAI provides objective evidence that the manufacturing and inspection process has been reviewed against the released product definition.

It helps demonstrate that:

• The correct engineering revision was used.

• Applicable characteristics were identified.

• The manufactured part meets the defined requirements.

• Required material and process documentation is available.

• Measurement methods are suitable for the specified characteristics.

• The inspected part can be traced to the relevant manufacturing activity.

FAI should be viewed as a production-risk-control process, not simply as a quality report created after machining is complete.

FAI vs First-Piece Inspection

A first-piece or first-off inspection normally asks:

“Does the first part from this setup meet the dimensions we need to control?”

A formal FAI asks a broader question:

“Can we provide objective evidence that a production-representative part satisfies the applicable product requirements and that the relevant manufacturing documentation is correct?”

First-piece inspection is often used internally during machine setup.

FAI may include that first-piece inspection, but also covers documentation, material, specified processes, traceability, drawing requirements, and formal reporting.

When Is FAI Required?

Not every CNC machining order requires a formal First Article Inspection Report.

The requirement may come from:

• Customer purchase orders

• Quality clauses

• Industry requirements

• Engineering specifications

• Supplier quality agreements

• Internal risk-control procedures

FAI is particularly common in aerospace, defense, medical, semiconductor, automotive, robotics, and other applications where production changes or nonconforming parts can have a significant downstream impact.

When AS9102C applies, the organization must evaluate changes that may invalidate or no longer be represented by a previous FAI. Current AS9102C guidance includes changes to engineering definition, manufacturing sources or processes, inspection methods, tooling, materials, manufacturing location, NC programs, corrective actions, certain disruptive events, and a two-year production lapse for potentially affected characteristics.

New Part or First Production Run

A new production part is one of the clearest reasons to perform FAI.

The objective is to verify the released design using a part produced by the intended manufacturing route.

For CNC machining, this may include:

• Programmed CNC operations

• Planned fixtures

• Intended cutting tools

• Production material

• Required heat treatment

• Surface finishing

• Final inspection

A prototype produced through a different temporary route should not automatically be treated as representative of the final production process.

Drawing or Design Revision

An engineering revision does not always mean that every characteristic must be re-inspected.

The first question is:

What changed, and can that change affect previously verified characteristics?

A modified hole position may only affect a small group of related dimensions and GD&T requirements.

A major geometry revision may invalidate most or all of the previous FAI.

The scope should follow the impact of the change.

Process, Tooling, Machine or Location Change

Manufacturing changes can trigger FAI review even when the CAD model and drawing revision stay the same.

Examples include:

• New fixture

• Different machining sequence

• New manufacturing source

• New inspection method

• Material change

• Relocation of production

• NC program change

• Tooling change that can affect product characteristics

Under AS9102C, organizations are expected to evaluate whether such changes invalidate or are no longer represented by the existing FAI evidence.

The important phrase is not simply “something changed.”

The important question is whether the change can affect product conformity.

Restart After a Significant Production Lapse

AS9102C includes a two-year production lapse as an event that requires evaluation and FAI activity for characteristics that may have been affected by the inactivity.

Customer-specific requirements may be stricter.

This is why purchase-order and quality-clause review should occur before manufacturing begins.

Full FAI vs Partial FAI

One of the most useful concepts in FAI planning is understanding when the entire product must be re-verified and when only affected characteristics require new evidence.

AS9102C Form 1 explicitly distinguishes between Full FAI and Partial FAI and provides for identification of the baseline configuration and reason for the FAI.

What Is a Full FAI?

A Full FAI establishes or re-establishes verification across the complete applicable product definition.

It is typically appropriate for a new part or when existing FAI evidence can no longer reasonably represent the current configuration and process.

A full FAI generally addresses all applicable design characteristics and supporting product-accountability requirements.

What Is a Partial FAI?

A Partial FAI is used when a previous acceptable FAI remains valid for unaffected characteristics, but specific changes require new verification.

Examples may include:

• A revised hole diameter

• A changed coating

• New tooling affecting selected dimensions

• A process change affecting a limited set of characteristics

• A drawing revision that changes only part of the design

The previous FAI becomes the baseline, and the partial FAI documents why re-accomplishment is required and which characteristics are affected.

What Is Delta FAI?

“Delta FAI” is a common industry term for inspecting and documenting the changed or affected portion of an existing baseline.

In AS9102 terminology, this is normally handled as a Partial FAI rather than as a separate official FAI type.

The practical idea is the same:

Do not repeat valid evidence unnecessarily, but do not assume that previous results remain valid when a change could affect them.

When Must Characteristics Be Re-Inspected?

The scope should be based on technical impact rather than convenience.

Suppose a fixture change alters the way a thin-wall housing is clamped.

Even if the drawing has not changed, characteristics influenced by clamping deformation may need new verification.

Conversely, a label-only revision may have no effect on machined geometry.

A good FAI process therefore requires engineering judgment, change evaluation, and documented rationale.

The First Article Inspection Process for CNC Machined Parts

FAI works best when inspection planning begins before machining.

Treating FAI as paperwork to be assembled at the end of the job increases the chance of missing characteristics, certificates, or measurements that cannot easily be recovered later.

Step 1: Review Drawing and Requirements

The process begins with confirming the correct technical baseline.

Review:

• Part number

• Drawing number

• Drawing revision

• 3D model revision

• Material

• Temper or condition

• General tolerances

• GD&T

• Surface finish

• Threads

• Drawing notes

• Special-process requirements

• Customer quality clauses

• Documentation requirements

A drawing should also clearly distinguish critical tolerances from general machining requirements.

For guidance on specifying practical dimensions and GD&T, see our CNC machining tolerance design guide.

Step 2: Create the Ballooned Drawing

Each applicable drawing characteristic is assigned a unique identifier.

These identifiers connect the engineering drawing to the inspection results.

For example:

• Balloon 1 → overall length

• Balloon 2 → bore diameter

• Balloon 3 → hole position

• Balloon 4 → flatness

• Balloon 5 → surface roughness

• Balloon 6 → drawing note

A ballooned drawing makes it easier for the manufacturer, inspector, customer, and auditor to confirm that nothing has been overlooked.

Step 3: Build the Inspection Plan

Not every characteristic should be measured with the same tool.

The inspection plan should determine:

• What must be measured

• What instrument or method is suitable

• What setup is needed

• Whether measurement occurs before or after finishing

• Whether the characteristic requires functional gauging

• Whether CMM programming is required

A ±0.50 mm overall dimension and a true-position requirement on a precision bore do not need the same inspection strategy.

Measurement uncertainty, accessibility, datum simulation, and part stability all matter.

Step 4: Machine the First Production Article

The inspected article should represent the intended production configuration as closely as practical.

That includes the manufacturing route, production documentation, tooling, fixtures, material, and applicable processes.

If a temporary setup or prototype process is used, that difference should be identified rather than silently treated as representative of production.

Step 5: Measure Applicable Characteristics

Inspection is then performed against the defined requirements.

Depending on the part, measurement may involve:

• Micrometers

• Calipers

• Bore gauges

• Height gauges

• Gauge pins

• Thread gauges

• CMM

• Optical measurement

• Surface roughness testing

• Functional gauges

For precision CNC components, different tools are frequently combined rather than forcing every characteristic onto a CMM.

Step 6: Verify Material and Special Processes

Dimensional conformity alone does not prove that the complete part meets specification.

The FAI review may also need to verify:

• Material grade

• Material condition or temper

• Heat treatment

• Plating

• Anodizing

• Passivation

• Coating

• NDT

• Functional testing

• Other specified processes

Where finishing affects critical dimensions, inspection may be required before finishing, after finishing, or both.

Our CNC surface finish design guide explains why coating buildup, masking, roughness, and post-finish dimensions need to be planned before production.

Step 7: Compile and Review the FAI Report

Before submission, the report should be reviewed as a complete package.

A technically acceptable part can still generate a rejected FAIR if documentation is incomplete or inconsistent.

The review should verify that:

• Balloon numbers match inspection records.

• The correct revision appears throughout the package.

• Required results are recorded.

• Material records match the part.

• Process certificates match the applicable specification.

• Nonconformances or approved deviations are clearly identified.

• Traceability is complete.

Step 8: Approve Production Release

FAI does not replace customer approval requirements.

Depending on the contract, production may continue internally while customer approval is pending, or formal approval may be required before further production or shipment.

The purchase order and customer quality requirements control this decision.

Once the required FAI acceptance is obtained, the verified configuration becomes an important production baseline.

What Is Included in an FAI Report?

The exact package depends on the applicable standard and customer requirement.

A robust CNC FAI package commonly combines drawing-based inspection evidence with material, process, and traceability records.

Ballooned Drawing

The ballooned drawing provides the map between engineering requirements and reported results.

Every applicable characteristic should be accounted for.

Dimensions are only part of that requirement.

Drawing notes, GD&T, material callouts, surface conditions, threads, and other requirements may also need characteristic identification.

Dimensional Results

The inspection report records the requirement and actual result for applicable dimensional characteristics.

A useful result is an actual measurement where measurement is appropriate.

For example:

Requirement: Ø12.000 ±0.010 mm
Actual: 11.997 mm

Reporting only “PASS” may not satisfy the applicable FAI or customer requirement for a measurable characteristic.

Material Certifications

Material certification establishes evidence that the material used corresponds to the required specification.

Depending on the project, records may include:

• Material grade

• Heat or lot number

• Temper

• Specification

• Supplier

• Test certificate

Material traceability is particularly important when high-performance alloys, heat treatment, or regulated-industry requirements apply.

Special Process Certifications

Special processes may require supporting certificates showing that the specified operation was completed to the appropriate requirement.

Examples include:

• Heat treatment

• Anodizing

• Plating

• Passivation

• NDT

• Chemical conversion coating

The certificate should be traceable to the relevant part, batch, or process activity as required.

Measurement Equipment and Traceability

Inspection equipment should be suitable for the required measurement and controlled under the supplier's calibration system.

Customer-specific FAI procedures may also require gauge identification or equipment references.

At NAITE TECH, dimensional verification is performed using calibrated inspection equipment, including CMM and precision measuring systems where appropriate. More information is available on our quality control and inspection page.

Nonconformance and Deviation Records

A nonconforming characteristic should never be hidden simply to make a FAIR appear complete.

If a requirement is not met, the issue should be:

1. Identified.

2. Controlled under the applicable nonconformance process.

3. Linked to the relevant characteristic.

4. Dispositioned or approved where applicable.

5. Re-verified after corrective action when required.

AS9102C revised Form 1 to explicitly identify whether a FAIR contains documented nonconformances, reinforcing the importance of transparent reporting.

AS9102C First Article Inspection Explained

AS9102 is the best-known formal FAI framework in aerospace manufacturing.

The current revision is AS9102C, revised June 28, 2023. The standard establishes requirements for performing and documenting First Article Inspection and is primarily intended to provide a consistent FAI process across aviation, space, and defense supply chains.

Is AS9102 Required for Every FAI?

No.

This distinction matters.

IAQG guidance states that 9102 may be self-imposed or required by contract, but is not automatically required by another published standard.

Outside aerospace, customers may request:

• A supplier-specific FAI

• Full dimensional inspection

• A dimensional report

• A customer template

• Another approval format

Therefore, asking for “FAI” does not automatically mean AS9102.

The quotation and purchase order should identify whether the customer requires:

• Standard supplier FAI

• AS9102C FAIR

• Customer-specific template

• Source inspection

• Customer approval before shipment

Form 1: Part Number Accountability

Form 1 establishes the identity and configuration of the product undergoing FAI.

Information includes items such as:

• Part number

• Part name

• Revision information

• Drawing identification

• FAIR identifier

• Full or Partial FAI status

• Baseline information for Partial FAI

• Reason for the FAI

• Assembly accountability where applicable

The objective is configuration control and traceability.

Form 2: Product Accountability

Form 2 addresses materials, special processes, and functional testing.

Typical CNC-related information may include:

• Material specification

• Material certification

• Heat treatment

• Anodizing

• Plating

• Passivation

• Approved process sources

• Functional test requirements

The official Rev C forms identify Form 2 as Product Accountability – Materials, Special Processes, and Functional Testing.

Form 3: Characteristic Accountability

Form 3 links product characteristics to verification results.

For machined components, this is where the relationship between the ballooned drawing and actual inspection data becomes especially important.

The current form is titled Characteristic Accountability, Verification, and Compatibility Evaluation and provides fields for characteristic identification, requirement, result, tooling where applicable, and nonconformance information.

Full vs Partial FAI Under AS9102C

Form 1 provides explicit Full FAI / Partial FAI identification.

For Partial FAI, the report references the baseline configuration and documents the reason for the new FAI activity. Reasons can include changes in design, process, manufacturing location, or production lapse.

What Changed in AS9102 Revision C?

Revision C updated both the FAI requirements and reporting structure.

Among the documented changes were stronger clarification around FAI planning and change evaluation, revisions to form fields and instructions, required FAIR identification, and changes to the way documented nonconformances are identified on Form 1.

For actual aerospace work, suppliers should use the current standard and forms rather than relying on older Rev B templates found online.

How CNC Features Are Verified During FAI

The inspection method should follow the characteristic.

There is no engineering benefit in using a CMM for a feature that is measured more reliably with a calibrated micrometer, nor should a caliper be used simply because it is faster when the tolerance requires a more capable method.

CMM Inspection

Coordinate Measuring Machines are particularly useful for:

• True position

• Complex datum structures

• Hole patterns

• Profiles

• Multiple related planes

• 3D geometry

• Features that must be evaluated in a common coordinate system

CMM inspection becomes especially valuable on multi-axis milled components and parts with complex GD&T.

It is not, however, mandatory for every FAI.

Calipers, Micrometers and Bore Gauges

Conventional precision instruments remain highly effective.

Examples include:

Micrometers

Useful for precise external widths, diameters, and thicknesses.

Bore gauges

Useful for accurate internal diameters.

Height gauges

Useful for features referenced to a surface plate and for selected positional measurements.

Calipers

Useful for appropriate general dimensions where instrument capability is sufficient.

The instrument must match the tolerance and characteristic.

GD&T Verification

GD&T requires more than checking individual coordinate dimensions.

The inspection method must reproduce the intended datum structure and evaluate the geometric requirement correctly.

For complex CNC parts, this is one reason proper drawing definition matters so much.

Our CNC tolerance design guide covers practical use of datums, GD&T, critical dimensions, holes, and machining tolerances in more detail.

Threads and Functional Gauging

Threads are normally verified using the appropriate gauge or measurement method.

Depending on the specification, this may involve:

• GO / NO-GO thread gauges

• Thread micrometers

• Optical inspection

• Other defined inspection methods

A thread callout should be inspected as the specified thread requirement rather than reduced to a simple major-diameter measurement.

Surface Roughness

If the drawing specifies surface roughness, that requirement becomes an inspection characteristic.

A sealing face specified at Ra 0.8 µm requires different verification from a general as-machined surface with no controlled roughness requirement.

Surface roughness should be measured with an appropriate surface-testing instrument rather than judged visually.

Optical and Vision Measurement

Optical systems are useful for:

• Small features

• Profiles

• Edge geometry

• Fine slots

• Features that are difficult to contact mechanically

The method should be selected based on feature geometry and required measurement uncertainty.

FAI vs Other Quality Documents

FAI is frequently confused with several other quality records.

They may overlap, but they do not serve the same purpose.

FAI vs Dimensional Inspection Report

A dimensional inspection report records measurements.

An FAI may contain a dimensional report, but a formal FAI can also address:

• Material

• Drawing notes

• Special processes

• Functional testing

• Revision control

• Traceability

Therefore:

FAIR > dimensional measurements alone.

FAI vs Certificate of Conformance

A Certificate of Conformance, or CoC, is a supplier declaration that the delivered product conforms to stated requirements.

It does not normally contain the characteristic-by-characteristic verification found in an FAI report.

The two documents can be required together.

FAI vs PPAP

FAI and PPAP both reduce production risk, but their scope and industry use differ.

FAI focuses on documented verification of the first production-representative article and its applicable product requirements.

PPAP, widely associated with automotive and customer-specific production approval systems, generally evaluates a broader package of product and manufacturing-process evidence.

A customer requesting PPAP should not automatically be given an FAI package as a substitute.

FAI vs In-Process Inspection

FAI establishes product verification at an initial or changed production state.

In-process inspection controls production while manufacturing continues.

For example:

FAI may confirm that a bore meets the drawing requirement when the job is introduced.

In-process control may then verify that the bore remains stable throughout a 2,000-piece production run.

FAI does not eliminate the need for process control.

FAI vs Final Inspection

Final inspection confirms that completed production parts satisfy the defined release criteria before shipment.

FAI validates the initial production configuration or affected changes.

The two activities occur at different stages and answer different quality questions.

What Happens If an FAI Fails?

An FAI issue should first be classified correctly.

There is an important difference between:

The part is nonconforming

and

The FAI documentation is incomplete or incorrect.

Both require action, but the corrective path is different.

Product Nonconformance vs Documentation Error

A product nonconformance may include:

• Oversized bore

• Hole outside positional tolerance

• Incorrect surface finish

• Wrong material

• Missing coating

• Thread failure

A documentation problem may include:

• Missing characteristic

• Incorrect drawing revision

• Missing process certificate

• Unclear traceability

• Transcription error

The physical part should not be reworked because of a paperwork error, and paperwork should not be used to hide a product nonconformance.

Corrective Action and Re-Inspection

If machining caused the nonconformance, the manufacturing team should determine the cause.

Potential causes include:

• Tool offset

• Fixture location

• Tool wear

• Program error

• Clamping distortion

• Thermal movement

• Incorrect process sequence

Once corrected, the affected characteristic should be re-inspected using an appropriate method.

Customer Deviation or Approval

A nonconforming part should not be assumed acceptable because the deviation is small.

If customer concession or deviation approval is permitted, it should be processed under the applicable quality procedure and purchase-order requirements.

Partial FAI After Correction

Corrective action used to complete a previous FAI is one of the events addressed by AS9102C change evaluation. A Partial FAI may be used to document re-verification of affected characteristics when appropriate.

The scope should cover any characteristics that could reasonably have been affected by the correction.

Common Reasons FAI Reports Are Rejected

FAI rejection is not always caused by a bad machined part.

Documentation quality is equally important.

Wrong Drawing Revision

The FAIR must correspond to the configuration actually ordered and manufactured.

A perfectly measured part produced to an obsolete drawing can still create a serious configuration-control problem.

Missing Balloon Characteristics

Every applicable requirement must be accounted for.

A missing characteristic creates an obvious question:

Was the requirement verified, or was it overlooked?

Good ballooning reduces this ambiguity.

Missing Notes or GD&T Results

Drawing notes are easy to overlook because they are not always placed beside the model geometry.

Examples include:

• Deburring

• Surface treatment

• General edge requirements

• Thread requirements

• Surface finish

• Special cleanliness

• Marking requirements

GD&T requirements must also be reported appropriately rather than replaced by unrelated linear measurements.

Missing Material or Process Certificates

If the drawing specifies material, heat treatment, coating, or another controlled process, the FAI package should include or reference the required evidence.

A dimensional result cannot prove material chemistry or heat-treatment condition.

Poor Traceability

Records should clearly connect:

• Part

• Drawing revision

• Manufacturing activity

• Material

• Process certificate

• Inspection record

Ambiguous traceability weakens the value of the FAIR.

Non-Representative First Article

An FAI is much less useful if the inspected part was produced using a method that will not be used for production.

Examples include:

• Prototype-only fixture

• Manual rework not planned for production

• Temporary machining operation

• Different supplier source

• Alternate special process

Where temporary conditions are unavoidable, they should be identified.

FAI Cost, Lead Time and Buyer Checklist

There is no meaningful universal price for First Article Inspection.

A simple turned spacer with ten characteristics requires a very different inspection effort from a five-axis housing with 150 ballooned characteristics, multiple datum reference frames, surface requirements, heat treatment, and several special-process certificates.

What Affects FAI Cost?

The main cost drivers include:

• Number of drawing characteristics

• Tolerance level

• GD&T complexity

• CMM programming

• Inspection setup complexity

• Surface roughness requirements

• Material documentation

• Special-process certification

• Customer-specific forms

• AS9102 requirements

• Report review time

Tighter tolerances also increase both machining and inspection effort. This relationship is discussed in more detail in our CNC machining tolerance guide.

What Affects FAI Lead Time?

FAI lead time can be affected by:

• Number of characteristics

• CMM program development

• External process certificates

• Material documentation

• Customer template requirements

• Report review

• Nonconformance resolution

• Customer approval cycle

FAI requirements should therefore be communicated during RFQ rather than after parts have already been manufactured.

When Should Buyers Request FAI?

A formal FAI is especially useful when:

• The part is entering production.

• The component has many critical characteristics.

• Supplier qualification is important.

• A process change creates risk.

• Regulatory or contractual requirements apply.

• The cost of batch-level failure is high.

• Traceability and documentation are important.

For a simple prototype whose purpose is only design evaluation, a full AS9102-style FAIR may add unnecessary cost.

Inspection level should match project risk.

CNC First Article Inspection Checklist

Before releasing an FAI requirement, confirm:

• Correct drawing and revision

• 3D model revision

• Material and temper

• Quantity

• FAI format

• AS9102 requirement, if applicable

• Customer-specific quality clauses

• Critical dimensions

• GD&T

• Surface finish

• Special processes

• Material certification

• Process certification

• Required measurement report

• Customer approval requirements

Providing this information during quotation helps the manufacturer plan inspection correctly from the beginning.

How NAITE TECH Performs First Article Inspection

At NAITE TECH, FAI is treated as part of production planning rather than as paperwork added after machining.

Our broader quality process combines incoming material control, in-process inspection, dimensional verification, calibrated measuring equipment, CMM where appropriate, traceable records, and final inspection.

Drawing and Revision Review

Before machining begins, the engineering and quality teams review the technical baseline.

This includes:

• Part number

• Revision

• Material

• Tolerances

• GD&T

• Threads

• Surface requirements

• Drawing notes

• Inspection documentation

Any ambiguity that could affect manufacturing or inspection should ideally be resolved before CNC programming and setup.

Balloon Drawing and Inspection Planning

For projects requiring formal FAI, characteristics are organized so they can be traced from the engineering drawing to the corresponding result.

The inspection plan then determines the appropriate measurement method for each type of characteristic.

Complex positional or profile requirements may be assigned to CMM.

Simple diameters may be better verified using calibrated micrometers or bore gauges.

Threads may require functional gauges.

Surface roughness may require dedicated roughness measurement.

Production-Representative First Article

The first article is manufactured using the intended CNC machining strategy as far as the project allows.

This is important because FAI should provide confidence in the process that will actually be used for production.

NAITE TECH supports prototype through repeat-production CNC machining across milling, turning, Swiss machining, and multi-axis operations. More information is available on our precision CNC machining services page.

CMM and Dimensional Inspection

Inspection method is selected according to tolerance, geometry, datum structure, and measurement accessibility.

Our quality-control capability includes calibrated dimensional equipment and CMM inspection for applicable precision characteristics.

CMM is particularly useful for:

• Complex GD&T

• Multi-face relationships

• Hole patterns

• Position

• Profiles

• Datum-based measurements

It is used where it adds measurement confidence rather than simply because a report requires an impressive machine name.

Material and Process Traceability

Where required, FAI documentation is supported by material and process records.

This may include:

• Material certification

• Material lot or heat traceability

• Heat-treatment documentation

• Anodizing or plating certification

• Other requested records

For components with significant finishing requirements, our surface finishing services are coordinated with machining and inspection so that critical dimensions and finished conditions can be planned together.

Report Review and Production Release

Before the FAI package is released, we review the consistency between:

drawing → balloon characteristic → requirement → result → supporting record

The objective is to detect missing or inconsistent information before the report reaches the customer.

Once required FAI acceptance is complete, production proceeds under the agreed manufacturing and inspection plan.

This does not mean quality control stops after FAI.

In-process inspection and final verification remain important for maintaining consistency from the first accepted part through the production batch.

Conclusion: FAI Is a Production-Control Tool, Not Just an Inspection Report

A good First Article Inspection does more than show that one CNC machined part happens to measure within tolerance.

It creates a documented relationship between:

the released engineering requirements, the production process, the physical part, the inspection results, and the supporting quality records.

For straightforward projects, that may mean a ballooned drawing and dimensional report.

For aerospace work governed by AS9102C, it may require a formal three-form FAIR supported by material, process, and characteristic-accountability evidence.

The right level of FAI should follow project risk and customer requirements.

Regardless of format, the most effective FAI process begins before machining—not after the first part is finished.

Drawing revision, inspection scope, material certification, special processes, GD&T, reporting format, and approval requirements should all be understood during quotation and process planning.

That approach reduces report rejection, avoids unnecessary re-inspection, and prevents a small issue on the first article from becoming an expensive problem across an entire production batch.

If your CNC machined components require First Article Inspection, dimensional reports, CMM verification, material traceability, or customer-specific quality documentation, contact NAITE TECH with your CAD files, technical drawings, and inspection requirements so the manufacturing and quality plan can be reviewed before production.