What Is First Article Inspection? A Guide for Industrial Buyers

When you source a custom industrial component, price and lead time only matter if the part is right. A casting or machined part can look correct and still have an out-of-tolerance bore, the wrong material grade, or a feature built to an outdated drawing revision. Find that after 500 pieces ship, and you're facing scrap, rework, and a stalled assembly line.

First article inspection (FAI) is how buyers and manufacturers catch those problems before they multiply.

The short answer: first article inspection is a documented check of the first production part against every applicable requirement on the drawing and specification. It proves the manufacturing process can make a conforming part before full production moves forward, and the results are recorded in a First Article Inspection Report (FAIR).

This guide covers what FAI checks, what the report should include, when to require it, and how to set up your next order for smooth inspection.

What Is First Article Inspection in Manufacturing?

First article inspection in manufacturing is a formal, documented verification that a part made with the intended production process, tooling, and materials meets its design requirements.

The "first article" is a representative part from the first production run, not a prototype or hand-built sample. That distinction matters: FAI validates the process that will make every part after it, not just the part on the inspection table.

A complete FAI typically verifies:

• Dimensions, tolerances, and geometric features (GD&T)

• Hole locations, thread specifications, and interface features

• Material grade and certifications

• Surface finish and coating requirements

• Heat treatment and other special processes

• Functional requirements and specified tests

  
  

FAI is not a quick visual check or a spot measurement of a few dimensions. A formal FAI accounts for every characteristic on the drawing, and its exact scope is set by the purchase order, the drawing notes, and any standard the customer invokes.

The First Article Inspection Process, Step by Step

Most FAIs follow the same seven-step sequence, whether the part is a small machined bracket or a large forged shaft.

1. Review requirements. The supplier gathers the purchase order, drawing, CAD model, material specs, and any referenced standards, and confirms the governing revision of each.

2. Balloon the drawing. Assign a unique number to every dimension, tolerance, note, and specification callout. A typical machined part may have 50 to 200 characteristics; complex assemblies can have far more.

3. Build an inspection plan. Assign each characteristic a measurement method, tool, and acceptance criterion. Flag critical characteristics and required tests.

4. Produce the first article. The part is made using production tooling, equipment, operators, and materials, not a prototype setup or a one-off workaround.

5. Inspect and test. Inspectors measure every ballooned characteristic, verify material and special-process records, and perform any functional tests the drawing requires.

6. Document results in the FAI. Record each characteristic with its requirement, actual result, and pass/fail status. Supporting certs and test reports are attached.

7. Disposition and approval. Correct nonconformances or formally disposition them, have the supplier sign off, and have the customer review and accept the report before releasing production.

The process only works if step 4 is honest. A first article produced with special handling or extra operator attention proves nothing about the parts that follow it.

Why First Article Inspection Matters to Buyers

A single error caught on the first part is a fix. The same error caught after a full production run is scrap, rework, and a missed delivery date. That's the core value of FAI.

1. It Verifies Dimensional Accuracy

FAI compares measured results against every dimension and tolerance on the drawing. This is critical for precision-machined parts and custom metal components that must mate with existing equipment.

2. It Confirms Material And Process Requirements

A part can have the right shape and still fail in service if it's the wrong alloy or skipped a heat treat. FAI ties the physical part to material certifications, heat treatment records, and coating documentation.

3. It Exposes Production Issues Early

FAI reveals problems with tooling, machine setup, fixturing, or how the shop interpreted the drawing. The supplier can correct the root cause before it repeats across the order.

4. It Creates A Documented Quality Record

The FAIR gives the buyer and supplier a shared, traceable record. It supports supplier approval, quality audits, and future reorders, and helps meet contractual or regulatory obligations in regulated industries.

5. It Reduces Total Project Cost

FAI adds inspection time up front, but that cost is small compared with scrap, rework, expedited replacements, and downtime on your end. One caveat: FAI doesn't guarantee every later part is defect-free. It establishes a verified baseline that ongoing quality controls maintain.

What Does a First Article Inspection Check?

The checklist depends on the part's design, manufacturing route, and quality requirements, but most FAIs cover five areas.

Dimensional Inspection

Inspectors measure every specified dimension and compare results with drawing tolerances. Tools are matched to the feature and accuracy required:

• Calipers and micrometers

• Pin, thread, and height gauges

• Coordinate measuring machines (CMMs)

• Optical and laser measurement systems

For complex parts, a CMM measures feature locations and geometric relationships (true position, flatness, concentricity) that hand tools can't verify reliably.

Drawing And Revision Verification

The inspector confirms the part was built to the correct drawing revision and that every dimension, note, and referenced specification has been addressed. This step catches errors from outdated drawings or misread tolerances.

Material Verification

The inspector checks the material grade against the drawing and reviews mill certifications or test reports. This matters most when strength, hardness, or corrosion resistance drives performance, such as with cast stainless steel grades or alloy forgings.

Surface Finish And Special Processes

Required finishes, coatings, plating, and heat treatment are verified by measurement, test results, or supplier certificates, depending on the specification.

Functional And Assembly Checks

Where function matters, FAI may include fit checks, thread engagement, interface dimensions, pressure tests, or other specified performance tests.

FAI for Castings, Forgings, and Machined Parts

The manufacturing process changes what an FAI needs to focus on. A good inspection plan targets the risks specific to how the part was made.

Castings

Castings carry risks that don't show up on the surface. Beyond dimensions, a casting FAI often includes:

• Internal soundness: radiographic (X-ray) or ultrasonic testing to detect porosity, shrinkage, or inclusions when the drawing or spec requires it.

• Surface integrity: visual, liquid penetrant, or magnetic particle inspection for cracks and surface defects.

• Chemistry and mechanicals: heat chemistry reports and test bar results for tensile strength, yield, and elongation.

• Machining stock: verification that as-cast surfaces leave enough material for finish machining.

Because the pattern or mold drives every casting that follows, a first article casting is effectively a validation of the tooling itself.

Forgings

Forgings are prized for strength and grain structure, so FAI often verifies those properties directly:

• Mechanical testing: hardness, tensile, and impact (Charpy) testing per the material spec.

• Heat treatment records: time, temperature, and quench documentation to confirm the specified condition was achieved.

• Grain flow or macroetch: sectioning and etching a sample to confirm grain flow follows the part contour, when specified.

• Die match and flash line: checks for mismatch between die halves and proper flash trim on closed die forgings.

  
  

The choice between open die vs. closed die forging also shapes the FAI: open die forgings carry more machining stock, so final dimensions are verified after machining rather than as-forged.

Machined Parts

Machined components are where most dimensional characteristics live. FAI emphasis typically includes:

• GD&T verification: true position, profile, flatness, perpendicularity, and runout, usually on a CMM.

• Threads: go/no-go gauging and thread form verification.

• Surface finish: profilometer readings against specified Ra values.

• Datum setup: confirmation that the part was measured from the datums defined on the drawing, not a convenient edge.

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Assemblies

For assemblies such as hydraulic cylinders, FAI covers each component plus the assembled unit: fit-up dimensions, torque values, seal installation, and functional tests such as pressure, leak, or stroke testing.

What Is Included in a First Article Inspection Report?

The First Article Inspection Report (FAIR) is the documented proof of the inspection. Its format follows the customer's requirements or a named standard, but a complete report typically includes:

Report element	What it documents
Part identification	Part number, description, and drawing revision
Dimensional results	Each required dimension, its tolerance, and the actual measurement
Inspection methods	Equipment or method used for each characteristic
Material records	Material certifications and test results
Special-process records	Heat treatment, coating, and finishing documentation
Nonconformances	Any discrepancies and how they were dispositioned
Approvals	Inspector sign-off and customer acceptance

Most reports use a ballooned drawing, which assigns a number to every characteristic on the print. Each number maps to a line in the report, so every requirement traces directly to its inspection result.

In aerospace, the AS9102 standard from SAE International defines a formal three-form FAIR covering part number accountability, product accountability, and characteristic accountability. Other industries often use customer-specific forms.

Don't assume every supplier's FAI package looks the same. Specify the format and contents you need on the purchase order.

AS9102 Forms Explained

Even outside aerospace, many buyers borrow the AS9102 structure because it's thorough and widely understood. The report is organized into three forms.

Form	Name	What it records
Form 1	Part Number Accountability	The part being inspected, its drawing revision, and any sub-assemblies or detail parts included
Form 2	Product Accountability	Raw material, special processes (heat treat, plating, NDT), and functional tests, with supplier and cert references
Form 3	Characteristic Accountability	Every ballooned characteristic, its requirement, the measured result, and conformance status

Form 3 is usually the longest. On a complex part, it can run to hundreds of lines, one for each characteristic on the drawing.

Full, Partial, and Delta FAI

Not every FAI starts from scratch. Three scopes are common:

• Full FAI: every characteristic on the drawing is inspected and documented. Used for new parts, new suppliers, and production transfers.

• Partial (delta) FAI: only characteristics affected by a change are re-verified, such as a revised dimension, a new material, or a replacement tool. Unaffected characteristics carry forward from the previous approved FAI.

• Re-FAI after a lapse: a renewed full or partial FAI after a long gap in production, to confirm the process still performs as originally approved.

A partial FAI saves time and cost, but only when the supplier can show clear traceability to the original approved report. Agree on the rules for each scope in your quality agreement.

When Should You Require First Article Inspection?

Require FAI whenever the part, the process, or the supplier is new or has changed, or when a nonconforming part would be costly or unsafe.

• New part: the component is being produced for the first time.

• New supplier: a manufacturer is making the part for you for the first time.

• Design revision: a change affects dimensions, materials, or interfaces.

• Tooling or process change: new dies, patterns, fixtures, machines, or methods could affect conformity.

• Production transfer: manufacturing moves to a different facility or source.

• Long production gap: your quality agreement requires re-verification after a period of inactivity (AS9102 uses two years).

• High-risk components: a discrepancy could affect safety, reliability, or downstream assembly.

Not every reorder needs a full FAI. When only some features change, a partial FAI covering just the affected characteristics is often enough. Define the trigger rules in your purchase terms or quality agreement.

First Article Inspection vs. In-Process and Final Inspection

All three support quality control, but each answers a different question.

Inspection type	Question it answers	Timing
First article inspection	Can this process make a conforming part?	First production run or after a qualifying change
In-process inspection	Is the process staying in control?	During production
Final inspection	Does this lot meet acceptance criteria?	Before shipment or release

FAI sets the verified baseline, in-process checks catch drift as work continues, and final inspection confirms each lot before release. An approved first article never replaces ongoing quality control.

FAI vs. PPAP and Other Approval Processes

Buyers often hear FAI mentioned alongside PPAP (Production Part Approval Process), especially when sourcing for automotive, heavy equipment, or transportation programs. They overlap, but they aren't the same.

	First Article Inspection	PPAP
Origin	Aerospace (AS9102) and general manufacturing	Automotive (AIAG)
Core question	Does this part meet every drawing requirement?	Can this process consistently produce conforming parts at production rate?
Scope	Inspection of the first article(s) and supporting records	Up to 18 elements, including dimensional results, PFMEA, control plan, MSA, and capability studies
Statistical evidence	Usually not required	Process capability (Cpk) studies often required
Typical use	New parts, suppliers, or changes across most industries	Automotive and suppliers that adopt automotive quality systems

In practice, FAI is a subset of the evidence PPAP requires. If your program demands proof of long-run process stability, ask for PPAP elements in addition to the FAI. If you need confirmation that the part matches the drawing, a well-scoped FAI is usually the right tool.

Common FAI Nonconformances

Most first article failures trace back to a short list of root causes:

Nonconformance	Typical root cause
Out-of-tolerance dimension	Machine offset, tool wear, fixture error, or casting/forging shrinkage not compensated
Wrong drawing revision	Outdated print on the shop floor or unclear revision on the PO
Missing or incorrect feature	Drawing note misread or overlooked during programming
Datum or GD&T error	Part measured or machined from the wrong datum reference
Material or cert mismatch	Wrong grade substituted, or certs don't match the heat used
Special-process gap	Heat treat, coating, or NDT record missing or out of spec
Incomplete documentation	Characteristics left unballooned or unrecorded in the FAIR

Many of these are documentation or communication failures rather than machining failures, which is why clear requirements at the quote stage prevent so many problems.

What Happens When a First Article Fails?

A failed first article isn't a disaster. It's the system working as intended. The typical response:

1. Contain. Production is held so the issue doesn't spread to more parts.

2. Investigate. The supplier identifies the root cause: setup, tooling, program, material, or drawing interpretation.

3. Correct. The process is fixed, whether that's a program edit, tool change, fixture adjustment, or die or pattern rework.

4. Disposition the part. The failed article is scrapped, reworked, or accepted under a formal deviation if the buyer's engineering team approves.

5. Re-inspect. A new first article is produced and inspected, often as a partial FAI covering the failed characteristics.

Don't pressure a supplier to accept a marginal first article to protect a schedule. Approving a nonconforming process locks the problem into every part that follows.

How to Prepare for First Article Inspection

The smoothest FAIs are defined before the first chip is cut. Settle these five items during quoting.

1. Send complete, current documentation. Provide the approved drawing, CAD model if available, material specs, and quality requirements, with the governing revision clearly identified.

2. Define the inspection scope. State whether you need a dimensional report, a full FAIR, material certs, special-process records, or a report to a named standard such as AS9102.

3. Flag critical characteristics. Call out key dimensions, special tolerances, and required tests, and agree on how nonconformances are documented and dispositioned.

4. Set the approval process. Decide who reviews the FAIR and whether production is on hold until you approve it. If so, write that into the purchase order.

5. Build inspection time into the schedule. Complex geometry, tight tolerances, and heavy documentation take time. Account for inspection and review in the delivery date.

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How FAI Supports Custom Industrial Manufacturing

Custom components often pass through several operations before they're finished, and each one can affect conformity. A casting needs machining to reach final dimensions. A forging needs machined interfaces to fit mating parts. A coating or heat treatment can shift critical characteristics.

FAI verifies the part after all of those steps are complete, so you're inspecting what you'll actually install. That's why it's especially valuable when casting and forging are combined with CNC machining and finishing, or when work is split across multiple suppliers.

How BMF Industrial Approaches Quality on Custom Components

At BMF Industrial, quality planning starts at the quote. Our team reviews your drawings, material requirements, and inspection expectations before production begins, so FAI scope and documentation are agreed up front, not negotiated after parts are made.

Whether your project involves castings, forgings, machined components, or hydraulic cylinders, coordinating manufacturing and inspection under one supplier gives you a clear path from first article to repeat production.

Frequently Asked Questions About First Article Inspection

What is the purpose of first article inspection?

FAI verifies and documents that a part from the first production run meets every applicable drawing and specification requirement, proving the production process works before full production proceeds.

Is first article inspection required for every order?

No. It's typically required for new parts, new suppliers, design or process changes, and long production gaps. Your contract or quality agreement should define when it applies.

What is the difference between FAI and a sample inspection?

A sample inspection checks selected characteristics on a limited number of parts. A formal FAI verifies every characteristic on the drawing and documents the evidence. Prototypes may also be built differently than production parts, so they don't validate the production process.

Does an approved first article guarantee every part will conform?

No. FAI confirms the process could make a conforming part at that point in time. Ongoing conformity depends on process controls and in-process and final inspection.

What is AS9102?

AS9102 is the SAE aerospace standard for performing and documenting first article inspection. Aerospace supply chains widely require it, while other industries often use it as a model or follow customer-specific forms.

What is a ballooned drawing?

A ballooned drawing numbers every characteristic on the print. Each balloon number links to a line in the FAIR, making every requirement traceable to its measured result.

How much does first article inspection cost?

Cost depends on part complexity, the number of characteristics, tolerances, testing, and report format. Define the scope at the quoting stage so inspection is priced and scheduled up front.

Who performs first article inspection?

Usually the supplier's quality team performs and documents the FAI. Buyers may witness it at the supplier's facility, review the FAI remotely, or verify selected characteristics themselves on receipt.

Can a third party perform FAI?

Yes. When a supplier lacks specific equipment or the buyer wants independent verification, an accredited metrology lab or third-party inspection service can perform all or part of the FAI.

How long does first article inspection take?

A simple part with a few dozen characteristics may take a few hours. A complex casting or assembly with hundreds of characteristics, NDT, and lab testing can take several days to complete and document, plus the customer's review time.

How many parts are inspected in an FAI?

Typically one part per unique part number, from the first production run. Some buyers require multiple first articles, for example, one from each mold cavity or each machine, when the process has more than one production path.

What is digital FAI?

Digital FAI uses software to automatically balloon drawings, pull results directly from CMMs, and generate the FAIR electronically. It reduces transcription errors and speeds up both the inspection and the buyer's review.

Plan Your Next Project With Confidence

Quality is easiest to manage when it's defined before production starts. Clear drawings, agreed inspection criteria, and documented acceptance requirements keep buyer and manufacturer aligned from first article to final shipment.

Planning a custom casting, forging, or machined component? Send BMF Industrial your drawings and inspection requirements, and our team will build quality into the plan from day one. Request a quote today.