First Article Inspection, often shortened to FAI, is a structured verification that an initial production output conforms to defined requirements before routine production continues.
The exact form varies by industry and customer requirement.
When FAI may be used
FAI may be appropriate after new product introduction, new tooling, major process change, supplier change, equipment relocation, significant engineering revision, or long production interruption.
The trigger should be defined by the organization’s quality system and customer requirements.
Verify more than one dimension
The inspection plan should reflect applicable requirements.
These may include dimensions, material, appearance, function, special characteristics, labeling, traceability, and documentation.
A Control Plan helps define what characteristics require control during normal production.
Confirm the measurement system
Inspection results are only as reliable as the measurement method.
Measurement System Analysis can help confirm that the measurement system is capable of supporting the decision.
Connect inspection to the process
FAI should verify not only the part but also the production conditions that created it.
Examples include correct program, approved tooling, correct material, revision status, process parameters, inspection method, and operator instructions.
Do not confuse FAI with capability
One conforming first article does not prove the process will remain stable or capable.
Process Capability requires data across repeated process output.
FAI answers a different question: can the defined setup produce a conforming initial result?
Define reaction rules
If the first article fails, stop release, contain affected material, determine the cause, correct the setup or process, repeat verification, and document approval before continuing.
Define what approval actually means
The organization should be explicit about the decision created by a successful FAI.
Approval may authorize normal production, shipment, or progression to the next launch stage, but only within the conditions that were actually verified.
If tooling, programs, material, process parameters, or revision status later change, the original approval may no longer represent the current process. The quality system should therefore define when re-verification is required.
Change Management helps control significant process changes so approval status does not become disconnected from the real operating condition.
Common mistakes
Treating one conforming part as proof of capability, checking only easy characteristics, using unverified measurement methods, failing to confirm revision status, and allowing production to continue before disposition are common mistakes.
Practical sequence
- define the FAI trigger.
- confirm the applicable drawing and revision.
- verify material and tooling.
- establish the inspection plan.
- verify measurement methods.
- produce the initial article.
- inspect required characteristics.
- resolve any nonconformity.
- approve release.
- transition to normal process controls.
The practical lesson
First Article Inspection is an early release gate.
It confirms that the process is starting from an approved condition, but it does not replace ongoing process control.