Introduction
A first article inspection report should help a buyer decide whether a defined manufacturing process has produced a component that meets its requirements. It should connect the part, drawing, material, process records, and inspection results. A spreadsheet filled with green cells is useful only when those connections are clear.
For overseas CNC purchases, this matters before committing to a larger lot. A sample can look excellent while using an outdated drawing, omitting a surface requirement, or recording measurements that do not represent the finished condition. Finding those gaps at receiving inspection is expensive and disruptive.
This guide explains how to plan and review first article evidence for custom machined parts. It distinguishes a commercial sample inspection from a specifically contracted aerospace FAI requirement and provides practical checks for engineering, quality, and purchasing teams.
Quick Answer: What Should a CNC First Article Report Include?
A useful first article package identifies the part and drawing revision, links each applicable requirement to inspection evidence, records actual results or suitable verification, and makes material, finishing, deviations, and approval status traceable. Define the package before production begins.
For a commercial order, agree on the scope and report format. If a contract requires AS9102 or another standard, specify its applicable revision and customer requirements. Do not assume that a generic dimensional report satisfies a standardized FAI obligation.
IAQG describes 9102 as a standardized FAI process, developed primarily for aviation, space, and defense and usable in other sectors. That scope does not make it mandatory for every CNC purchase or establish any supplier’s certification.
1. Define What the First Article Must Prove
Start with a question: what decision will the evidence support? A prototype may verify fit for design development. A first article from a planned production route may support manufacturing approval. These activities can overlap, but their purpose and acceptance conditions differ.
Separate Design Validation From Manufacturing Verification
Dimensional compliance does not prove that a design will survive its operating loads. A successful assembly trial does not prove every drawing characteristic. A material certificate does not prove the finished geometry.
Assign each concern to appropriate evidence. If factory testing includes a leak test, electrical test, or load test, define the procedure, conditions, acceptance criteria, and report. Keep those requirements distinguishable from the dimensional inspection.
Identify the Release Decision
State whether the supplier may continue production before approval, must hold the batch, or may ship only the submitted samples. Define the authorized reviewer and expected review sequence.
Without a clear hold point, purchasing may believe production is paused while the supplier assumes it can proceed. The inspection package should support an explicit decision about the next stage.
2. Freeze the Drawing and Model Revision
The report must correspond to the correct specification. Confirm part number, drawing revision, model revision, applicable notes, and purchase order requirements before starting inspection planning.
Include Requirements Outside the Main Views
Important requirements can appear in general notes, referenced specifications, model-based definitions, or purchasing clauses. Examples include material condition, edge treatment, surface texture, marking, and cleanliness.
Resolve contradictions before the first part is made. If the model and drawing disagree, identify the controlling requirement through the approved clarification process. The inspector should not have to choose a nominal value independently.
Preserve the Inspection Reference
Keep a controlled copy of the document used for the report. Characteristic numbering should remain interpretable when the package is reviewed later. A report detached from its reference drawing is difficult to audit and easy to misread.
Changes made during sample development should result in a clearly identified revision or approved deviation. Do not silently update the drawing while leaving the report attached to its previous version.
3. Link Every Applicable Characteristic to Evidence
Ballooning gives each requirement an identifier that can be traced to a result. The goal is complete, understandable coverage, not simply adding numbers around a drawing.
Include Notes and Geometric Requirements
A bore diameter and its position relative to datums are separate characteristics. A general edge requirement may apply across several features. A surface requirement may need a different method from a linear dimension.
Review whether each applicable requirement is covered, combined appropriately, or explained as not applicable. Avoid treating an empty cell as an implicit pass. If a characteristic cannot be verified after assembly or treatment, plan an earlier check and retain its evidence.
Use Actual Results Where Appropriate
For a numerical requirement, actual measured values usually tell the reviewer more than “OK.” Attribute checks, such as an agreed gauge result or visual verification, need an identifiable method and acceptance basis.
| Record element | Buyer’s review question |
|---|---|
| Characteristic identifier | Can it be found on the controlled reference? |
| Requirement and limits | Are units, tolerances, and notes interpreted correctly? |
| Method or equipment | Is the method suitable for this feature? |
| Result | Does it represent the required condition? |
| Sample identity | Which submitted part produced the result? |
| Disposition | Is a deviation approved, open, or rejected? |
4. Review the Measurement Method and Setup
A report can contain plausible numbers produced by an unsuitable setup. Buyers do not need to rewrite every inspection program, but critical measurements deserve a clear technical basis.
Check Datum Interpretation
The inspection alignment should represent the drawing’s datum framework. Ask how the component is located and supported. For thin or flexible parts, determine whether the required condition is free, restrained, or defined by another approved setup.
A flatness result measured under strong clamping may not describe the part after release. A feature position result from an arbitrary alignment may not answer the specified datum relationship. The setup is part of the meaning of the result.
Distinguish Resolution From Measurement Confidence
An instrument displaying many decimal places does not automatically provide adequate measurement confidence. Consider calibration status, uncertainty, access, fixturing, surface condition, and environment in relation to the tolerance.
Renishaw’s CMM calibration information illustrates that calibration involves defined artifacts and stated uncertainty. Its published calibration figures should not be transferred to another machine or treated as the uncertainty of a particular part measurement.
Discuss Your First Article Requirements
Send YILIU your controlled drawing, model, quantity, and required submission format. Highlight critical characteristics, material records, surface requirements, and any factory testing. Agree on sample identity, inspection stages, and approval responsibilities before the first production run.
The CNC supplier qualification guide explains how this evidence fits into a broader purchasing decision.
Send your drawing, model, quantity, critical features, report format, and required material or finishing records. Agree on inspection scope and sample approval responsibilities.
Open the full RFQ form →5. Connect Material and Finishing Records to the Parts
Material and process documents belong in the package when required by the order. Their presence alone is insufficient; the reviewer must be able to connect them to the submitted components.
Verify Material Identity and Condition
Check the specified grade, temper or condition, product form, and relevant specification. Review how heat or lot identity is maintained from stock to finished parts where that traceability is required.
A generic alloy datasheet is background information. It does not replace a required certificate for the purchased material. If stock was substituted, locate the written approval and confirm that it covers the supplied condition.
Review the Final Processing Stage
Identify coating, anodizing, heat treatment, passivation, or other specified operations. Confirm whether critical dimensions were checked before or after the operation and whether the report represents the required finished condition.
For example, a bore measured before anodizing does not establish its final treated size. Read the anodizing tolerance guide when a finish can affect assembly.
6. Make the Submission Representative of Production
A sample provides stronger manufacturing evidence when its route corresponds to the intended production route. Identify relevant differences rather than assuming every sample represents the future lot.
Record Important Process Differences
A prototype may use different stock, temporary workholding, additional manual finishing, or a different treatment provider. Some differences may be acceptable for design development, but they should be visible before a production decision.
Ask which process was used and what will change. If production depends on a fixture that was not used for the sample, consider what additional verification is needed after that fixture is introduced.
Agree on Sample Quantity and Identification
One inspected part can show that one part met its recorded requirements. It cannot, by itself, establish the long-term behavior of the process. Choose the sample quantity according to the application, order, and qualification requirements.
If several samples are measured, keep the results connected to individual parts or an agreed identification scheme. Avoid mixing selected best results from different samples into one apparently complete conforming record.
7. Resolve Deviations Before Approval
A nonconformance should be visible, described, and dispositioned by an authorized person. It should not disappear because the report template expects a green result.
Distinguish Correction From Acceptance
If a part is reworked, document the approved route and verify the affected requirements again. If the customer accepts a deviation, record its scope, quantity, and conditions. A one-time acceptance does not automatically change the drawing for later orders.
Do not overwrite the original measured value without retaining an understandable record of what changed. The buyer needs to know whether the component was corrected, accepted under concession, or replaced.
Consider Related Characteristics
Reworking a diameter may affect coating coverage or surface texture. Correcting a face may change a datum relationship. The verification should cover the consequences of the operation, not just the dimension that originally failed.
If the design requirement changes, identify the new revision and decide how the existing samples and reports relate to it. Approval must refer to a clear delivered condition.
8. Understand What First Article Approval Does Not Establish
First article approval is a defined milestone. It does not replace controls during a longer production run or remove the need for appropriate shipment inspection.
Keep Routine Inspection Separate
Agree on in-process and final inspection, sampling where applicable, critical-feature checks, and handling of nonconforming material. The right plan depends on the consequence of failure, manufacturing variation, and customer requirements.
Avoid inventing a universal sample size or assuming 100% inspection guarantees zero defects. Measurement suitability and process control still matter. Where statistical capability is required, plan an appropriate study with sufficient representative data; a first article table alone is not that study.
Define Reinspection Triggers
Changes in drawing, manufacturing route, material source, workholding, or significant production interruption may prompt review under the applicable contract and standard. Establish who evaluates a change and what evidence is needed.
Do not apply a remembered rule from another customer automatically. If standardized FAI is required, use the contracted standard and customer clauses to determine full or partial repeat requirements.
9. Complete Shipment Inspection and Receiving Handover
Before shipping, confirm that the parts and documents describe the same lot and revision. Protect critical surfaces, identify the samples, and include the agreed records.
Review the Package Before Dispatch
Check quantity, labeling, inspection status, approved deviations, certificates, and protection. If the first article is approved but the remaining batch is still under inspection, keep those statuses distinguishable.
Packing photographs can support a review of physical protection and identification. They do not prove dimensional compliance or replace the first article package. AI-generated shipment images should never be used as evidence that an actual order has been packed.
Plan Installation Preparation
Tell the receiving team which samples were evaluated, which reports apply, and whether any temporary protection needs removal. Identify storage or cleaning requirements that affect readiness for assembly.
If receiving measurements disagree, compare part identity, temperature, datum setup, method, and drawing interpretation before assigning a cause. Keep the part in its received condition until the investigation and disposition are agreed.
A Practical Review Sequence for Buyers
Begin with identity: correct part, revision, order, and sample. Next check requirement coverage, including notes and referenced specifications. Then review measurement methods and actual results for the most important features.
Continue with material and process traceability, final treatment condition, and any functional tests. Resolve deviations and process differences before recording approval. Finally, state whether the decision permits production, shipment, or only the next evaluation step.
This sequence helps purchasing coordinate the review without replacing engineering or quality authority. A buyer can organize a complete package while technical reviewers determine whether the evidence is adequate for the application.
FAQ
Is a dimensional report the same as a first article inspection report?
Not necessarily. A dimensional report may be one part of the package. The required first article scope can also include material, process, notes, identification, and other evidence defined by the contract.
Does every CNC order require AS9102?
No. Specify it when the contract requires it. Commercial buyers can define a suitable first article package without representing it as AS9102 compliance.
Does CMM inspection verify every drawing requirement?
No. Threads, texture, material, coating, cleanliness, and functional performance may need other methods. Select the evidence for each requirement rather than choosing one instrument for everything.
Should the report list actual dimensions or only pass and fail?
Use actual values for numerical characteristics where appropriate and agreed verification for attribute requirements. A clear result should identify the method and applicable limits.
Does an approved sample guarantee the whole batch?
No. It supports the defined approval decision. Production controls, agreed sampling, final inspection, and change management remain necessary for the supplied lot.
What if the customer has no report template?
Agree on one before the first run. Identify required fields, drawing references, sample identity, supporting records, deviation handling, and approval responsibility. A clear commercial template is better than an assumed scope.
Conclusion
A useful first article package makes the manufacturing result reviewable. It connects requirements to suitable evidence and keeps material, process, revision, sample identity, and approval status clear.
Plan the package during quotation, review the finished condition, and resolve deviations before release. Treat first article approval as one part of a controlled purchasing process that continues through production, shipment, and receiving.
Send Your Inspection and Production Requirements
Share your model, drawing, order quantity, critical features, required report format, and approval schedule with YILIU. Include material certificates, finishing records, and functional tests required by your application. Request a quotation with the inspection scope and sample submission responsibilities stated clearly.
Explore YILIU quality resources and RFQ preparation to assemble your inquiry package.
Start with your requirements.
Send your drawing, model, quantity, critical features, report format, and required material or finishing records. Agree on inspection scope and sample approval responsibilities.
helen.han@yiliuprecision.comManufacturing evidence you can review
Equipment and material examples refer to the supplied inventory, company profile and manufacturer literature. General guidance and illustrative images are not customer delivery case studies or a substitute for drawing review. Agree on inspection, reporting and delivery scope for each project.
Need to verify a capability or request a correction? Contact the YILIU team.
This article provides general guidance. Examples are illustrative, not completed customer case studies. Manufacturing feasibility, tolerances, testing, price, and delivery require project-specific agreement.