A good sample can prove that one acceptable part was made. It does not automatically prove that the supplier has established a repeatable production process.
That distinction matters when a buyer releases a batch after receiving a polished sample, a few selected dimensions or photographs. The sample may have been produced by a different machine, specialist operator, temporary tool, alternative material lot or extra manual rework. Unless those conditions are visible, approval can be based on a result that normal production will not reproduce.
The purpose of first-article inspection is therefore not simply “check one part”. It is to confirm, at an agreed point, that the product definition has been understood and that the planned process can produce verifiable output before production risk expands.
Define what kind of sample is being requested
The words sample, prototype, pre-production sample and first article are often used interchangeably, but they may support different decisions.
- A concept or appearance sample may confirm size, colour, ergonomics or visual direction while using non-production methods.
- An engineering prototype may test fit or function before the design is frozen.
- A process trial may explore tooling, parameters or special processing.
- A first article should normally be produced to an approved baseline using the intended or clearly disclosed production process and should be supported by defined verification records.
State which decision the submission must support. If non-production tooling or manual finishing is allowed, record that limitation. The buyer can still approve a development sample without treating it as evidence for batch release.
IAQG describes the 9102 first-article standard as applying when a new part is introduced or when a change invalidates the original first-article inspection result. It aims to provide consistent documentation and verify that production processes can produce parts conforming to engineering and design requirements. IAQG — 9102 First Article Inspection Requirement That standard is sector-specific and should not be imposed automatically on every order, but its underlying distinction between documented process verification and informal sample approval is broadly useful.
Freeze the baseline before inspection
The submission should identify the part number, drawing revision, model revision, specifications, approved deviations and purchase-order reference. If the sample was made before a design change, it cannot silently approve the new version.
Create a ballooned or otherwise indexed characteristic list so each reported result can be linked to the governing requirement. Include dimensions, notes, material, special processes, marking and any functional tests within the agreed scope. Open questions must be closed or explicitly excluded from release.
The supplier should also declare the manufacturing route: material source or lot, machine or process type, tooling status, external processors and inspection methods. This need not reveal proprietary parameters. It must be detailed enough to show whether the first article represents the planned batch.
Review evidence in layers
An effective first-article package commonly covers five evidence layers.
1. Product-definition evidence
Confirm that the supplier used the correct revision and has accounted for notes, general tolerances, referenced standards and approved clarifications. A dimensional report cannot compensate for a missing drawing requirement.
2. Material evidence
Check the specified grade, condition and inspection document. Link heat, batch or incoming identity to the first-article piece where traceability is required. A generic certificate with no connection to the sample is weak evidence.
3. Manufacturing and special-process evidence
Identify processes that cannot be fully verified by final dimensional inspection: heat treatment, welding, plating, passivation, coating, nondestructive testing or other outsourced operations. Review the required process certificate, parameters or qualification evidence at the level agreed for the project.
4. Dimensional and functional evidence
Report actual values for defined characteristics, not only a global “pass”. Confirm measurement method, datum alignment, part condition and units. Functional tests should include test conditions and acceptance limits.
5. Visual, packaging and identification evidence
Appearance, deburring, cleanliness, marking and protective packaging can be approval characteristics when specified. Use photographs to supplement controlled criteria, not replace them.
Confirm how the part was selected
An unannounced “golden sample” selected after extensive sorting gives a different level of confidence from a part taken from a planned production setup. Ask how many pieces were made, which piece was submitted, whether rework occurred and what happened to the others.
For multi-cavity, multi-machine or multi-tool production, one piece may not represent every source of variation. Define whether the first article covers one setup or all distinct production streams. The correct scope depends on risk and process design.
If the supplier intentionally performs extra operations on the submitted piece, those operations should either become controlled production steps or be removed before approval. Hidden craftsmanship is not a scalable control plan.
Approval is a decision with conditions
Avoid vague messages such as “sample looks good” when the intention is to release production. Use a recorded disposition:
- approved for production;
- conditionally approved subject to listed actions;
- rejected and resubmission required; or
- approved only for development, not batch release.
List every open deviation and its scope. A temporary concession should state affected quantity or lot and expiry. If a characteristic cannot yet be verified, identify who owns the missing evidence and whether production may proceed at risk.
Approval should also define what changes trigger review or a new first article. Typical triggers include drawing revision, material or source change, new tooling, process relocation, long interruption, new external processor or a corrective action that changes the process. The trigger set should be proportionate and contractually clear.
Do not confuse FAI with process capability
A conforming first article is a snapshot. It is not statistical proof that thousands of parts will remain conforming. Stable batch production may require setup approval, in-process checks, tool-life controls, capability studies, lot sampling and final release.
Likewise, a failed first article should not be solved only by reworking the sample. The supplier should identify whether the cause was unclear requirements, programming, tooling, measurement, material, external processing or operator execution, then update the process evidence before resubmission.
ASQ describes quality plans as documents that identify quality standards, practices, resources, specifications and the sequence of activities relevant to a product or project. ASQ — Quality Plans The first article should connect to that wider production control, not sit as an isolated certificate.
Maintain a first-article change log
The approved submission should become a controlled reference, not a folder that nobody revisits. Maintain a concise log of the baseline, approval date, conditions, corrective actions and later changes. When a trigger occurs, decide whether a full, partial or no new first-article inspection is justified and record the rationale.
A partial FAI can focus on affected and potentially affected characteristics, but the impact review should consider interfaces. Changing a coating may affect thickness, electrical contact and thread fit; changing material condition may affect machining and heat treatment. “Only one note changed” does not necessarily mean only one result needs review.
The log also separates the approved production route from later convenience changes, giving purchasing a clear question to ask on every repeat order.
First-article release checklist
- Is the purpose of the submission defined?
- Does it identify the approved drawing, model and specification revisions?
- Were intended production equipment, tooling and external processes used, or were deviations disclosed?
- Is each required characteristic indexed to evidence?
- Are material and special-process records connected to the sample?
- Are measurement methods and actual results clear?
- Were rework, selection and non-production operations disclosed?
- Are all cavities, tools, machines or lines represented where necessary?
- Is the disposition recorded with conditions and open actions?
- Are production quantity, effective lot and change triggers stated?
- Does the batch control plan address variation beyond the first article?
The procurement decision
The release record should be available to purchasing as well as engineering and quality. If the order is placed before conditional actions are closed, the purchase commitment should state the commercial consequence of failure and the point at which further work must stop. This prevents a technical “conditional approval” from being interpreted as unrestricted commercial release.
The buyer should release production only when the evidence answers the intended decision. A beautiful sample with an unclear process is weaker than a representative part with transparent records and controlled corrective actions. The goal is not paperwork for its own sake; it is to stop uncertainty from multiplying into a full batch.
Morning Sunlight Asia can manage first-article baselines, review supplier evidence and follow release actions before batch production in China. Submit Your Requirements to define an approval package proportionate to the part and its risk.