# CNC Machining Aerospace Parts: A Requirements Guide

> AS9100D, NADCAP, ITAR and FAA requirements decoded. Precision Advanced Manufacturing meets the full aerospace CNC machining stack. Request a quote.

**Published:** 2026-06-26 | **Updated:** 2026-10-22 | **Author:** precision
**URL:** https://precisionam.com/articles/aerospace/cnc-machining-aerospace-parts-requirements/
**Type:** post

**Categories:** Aerospace

![CNC Machining Aerospace Parts: A Requirements Guide](https://blog.precisionam.com/wp-content/uploads/sites/56/2026/06/1782347472398-2681db2039a3-1024x572.webp)

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## Content

*Last updated: October 21, 2026*

## Key Takeaways

- Aerospace CNC requirements come from three sources: the engineering drawing, the purchase order and governing standards (AS9100D, AS9102, NADCAP). Each source carries obligations that a supplier certificate cannot replace.
- AS9100D covers the supplier’s quality management system. The drawing and PO still govern tolerances, GD&T, materials and special processes for each part.
- AS9102 first article inspection is a contractual deliverable. Every drawing characteristic must be ballooned, recorded on Form 3 and accepted before series production.
- NADCAP accreditation, ITAR/EAR registration and FAA production approval sit alongside AS9100D. Buyers must confirm that each requirement flows correctly through the PO and sub-tier suppliers.
- Precision Advanced Manufacturing maintains AS9100D and ISO 9001:2015 certification, ITAR registration and full traceability systems to support the complete aerospace CNC requirement stack.

[Share Program Requirements With Precision Advanced Manufacturing](https://precisionam.com/request-a-quote/?utm_source=ai-growht-agent&utm_term=cnc-machining-aerospace-parts-requirements)

## The Document Hierarchy For CNC Machining Aerospace Parts

CNC machining aerospace parts requirements form a hierarchy. Treating them as a flat checklist creates gaps, because some obligations live only on the drawing or PO while others live in standards.

![A machined metal part fixtured inside a CNC machining center.](https://cdn.aigrowthmarketer.co/1785163886671-8f5217244f88.webp)**Mission-critical components leave no room for deviation. Multi-axis CNC machining holds tight tolerances part after part, with full material traceability behind every feature.**

Each layer of the stack has a clear owner, and that split explains why a supplier certificate can never replace a drawing or PO requirement:

- **Engineering drawing and specification** are owned by the design authority or customer. The drawing defines geometry, tolerances, materials, surface finishes and applicable specifications. No supplier certificate substitutes for these requirements.
- **Purchase order and flow-down clauses** are owned by the customer. The PO activates quality clauses, special-process requirements, documentation deliverables and ITAR handling obligations.
- **AS9100D quality management system** is held by the machining supplier. The supplier’s QMS governs how it plans, executes, inspects and records production. [AS9100D is owned by the International Aerospace Quality Group (IAQG)](https://spilma.com/en/guides/qms-iso-9001-as-9100-iso-13485-tl-9000) and published in the United States through SAE International.
- **AS9102 first article inspection** is performed by the supplier and accepted by the customer. The FAI report functions as a deliverable, not an internal record.
- **NADCAP accreditation for special processes** is held by the processor and flowed down through the supplier. [NADCAP is administered by the Performance Review Institute (PRI)](https://p-r-i.org/nadcap).
- **ITAR/EAR registration and classification** are held by the supplier and managed at the program level. Registration with the [State Department’s Directorate of Defense Trade Controls (DDTC) for ITAR](https://research.mit.edu/security-integrity-and-compliance/export-control/export-control-key-concepts/export-control-regulations) and classification under the [Commerce Department’s Bureau of Industry and Security (BIS) for EAR](https://research.mit.edu/security-integrity-and-compliance/export-control/export-control-key-concepts/export-control-regulations) are separate obligations.

The supplier’s AS9100D certificate covers its quality system. The drawing and PO govern the specific part. Buyers who blur these layers often discover at first lot that a required process, material or documentation deliverable was never specified.

## Tolerances And GD&T Defined On The Drawing

The drawing sets tolerance requirements for CNC machining aerospace parts. No general range applies across programs or platforms.

Aerospace machining often involves thousandths-of-an-inch tolerances, with tighter limits on engine interfaces, flight-critical features and precision bearing fits. The drawing, not industry convention, defines each requirement.

Inspection method follows tolerance class. Tighter tolerances typically require coordinate measuring machine verification or equivalent metrology. Looser features may be verified with calibrated hand tools.

![A CMM touch probe measuring a machined aluminum bracket.](https://cdn.aigrowthmarketer.co/1785164194032-a09872ce26c4.webp)**Every critical dimension is verified — CMM inspection and controlled quality workflows produce first-article and in-process data you can trace to each part.**

The supplier and buyer should agree on inspection method at quote stage. A method mismatch discovered at FAI can delay lot acceptance. For more on tolerance verification in aerospace CNC work, see [Tight Tolerance CNC Machining for Aerospace Parts](https://precisionam.com/articles/tight-tolerance-cnc-aerospace/?utm_source=ai-growht-agent&utm_term=cnc-machining-aerospace-parts-requirements).

GD&T callouts, datum schemes and surface finish requirements are drawing-driven. The shop must interpret the datum reference frame correctly, apply the right measurement setup and verify surface finish to the specified Ra or Rz value. These points are resolved during design-for-manufacturability review at quote stage, not during production.

![A five-axis CNC head machining a round metal workpiece.](https://cdn.aigrowthmarketer.co/1785163943949-293d9b0cce58.webp)**Five-axis machining reaches complex geometries in a single setup — fewer fixtures, tighter true position, and the repeatability aerospace and defense programs demand.**

## AS9100D As The Quality Management System Baseline

[AS9100D incorporates all ISO 9001:2015 requirements verbatim plus about 105 aerospace-specific additions](https://thestandardsnavigator.com/tag/as9100d). These additions cover operational risk management, configuration management, product safety, counterfeit parts prevention, first article inspection and foreign object debris controls.

For a CNC machining supplier, AS9100D requires documented controls across production planning, supplier qualification, nonconforming product, corrective action and configuration status accounting. [Configuration management under Clause 8.1.2 requires control of the approved drawing revision, tooling and inspection criteria](https://thestandardsnavigator.com/tag/as9100d) so production always uses the correct baseline.

Buyers should verify the scope of a supplier’s AS9100D certificate. A certificate scoped to “machining of aerospace components” differs from one scoped to “machining of titanium aerospace structural components.” [AS9100 certification status is verified through the IAQG’s OASIS database](https://spilma.com/en/guides/qms-iso-9001-as-9100-iso-13485-tl-9000). A certificate not listed in OASIS does not satisfy prime contractor supplier qualification requirements.

AS9100D certification functions as a baseline expectation for aerospace CNC machining. [CNC Machining Aerospace Components: Qualify a U.S. Partner](https://precisionam.com/articles/precision-cnc-machining-aerospace-components/?utm_source=ai-growht-agent&utm_term=cnc-machining-aerospace-parts-requirements) covers the broader supplier qualification process in detail.

## AS9102 First Article Inspection Requirements

[AS9102, maintained by SAE International’s Aerospace Standards Committee](https://thestandardsnavigator.com/2026/07/30/first-article-inspection-requirements), defines the format and content of the First Article Inspection Report. [AS9100D Clause 8.5.1.3 requires a representative item from the first production run to be fully inspected, verified and documented](https://thestandardsnavigator.com/2026/07/30/first-article-inspection-requirements) before series production begins. AS9102 provides the documentation format used to satisfy that clause.

The FAI verifies that the manufacturing process can produce a part conforming to every drawing and specification requirement. It confirms process capability, not just a single passing part.

**The ballooned drawing** forms the foundation of the FAI. [Every characteristic on the drawing, including dimensions, tolerances, notes, material requirements, surface finishes, datum information and process requirements, receives a unique balloon number](https://qa-report.com/blogs/as9102-first-article-inspection-report-forms-template.html). Each balloon number cross-references to a measured, documented result on Form 3.

A characteristic that never receives a balloon never receives verification. That gap often drives FAIR rejection.

AS9102 organizes FAI evidence into three forms:

- **Form 1, part number accountability.** This cover sheet and approval record identifies the part number, drawing revision, FAIR number, manufacturing organization, full-versus-partial FAI designation and the approval signature.
- **Form 2, product accountability.** This form records every material, special process and functional test on the drawing. It cross-references the governing specification, supplier information and certificate or report identifiers.
- **Form 3, characteristic accountability.** This form lists every ballooned characteristic, its requirement, the actual measured result, the inspection method and any nonconformance reference. Actual measured values must be recorded, not generic “pass” entries, unless the characteristic is genuinely attribute-based.

A full FAI applies to the first production run of a new part number and to broad changes that affect most characteristics. A partial FAI covers only characteristics affected by a specific change and references the baseline FAIR for all others.

[AS9102 defines five triggers for a new or partial FAI](https://thestandardsnavigator.com/2026/07/30/first-article-inspection-requirements): the first production run of a new part, a design change affecting fit, form or function, a change in manufacturing source, plant or significant process, a change in material or special-process supplier and a [production lapse exceeding two years](https://thestandardsnavigator.com/2026/07/30/first-article-inspection-requirements). Customers may impose a shorter lapse period or require a full FAI regardless of scope.

The FAI report functions as a deliverable that accompanies the first lot. It is separate from routine inspection reporting and must be reviewed and accepted before the lot moves into series production.

[The most common reason FAIRs are rejected involves drawing characteristics that never appear on Form 3](https://thestandardsnavigator.com/2026/07/30/first-article-inspection-requirements), such as a missed note, a general datum requirement or a material callout in the title block.

[Send Drawing And PO For FAI-Focused Review](https://precisionam.com/request-a-quote/?utm_source=ai-growht-agent&utm_term=cnc-machining-aerospace-parts-requirements)

## NADCAP Special Processes And Flow-Down In Aerospace CNC Machining

Special processes applied to a conforming part carry their own accreditation requirements, which is where NADCAP enters the stack.

[NADCAP accreditation applies to special processes and is administered by PRI across 24 critical process programs](https://nadcap.org), including heat treating, nondestructive testing, chemical processing, welding and coatings. These processes are commonly flowed down through the purchase order when a machined aerospace part requires them.

Post-machining steps that typically trigger a NADCAP-accredited processor include:

- Heat treatment and aging
- Nondestructive testing such as liquid penetrant inspection or radiographic inspection
- Chemical processing such as passivation, etching or conversion coating
- Coating processes such as anodizing or plating

[NADCAP accreditation is process-specific and facility-specific](https://nadcap.org). Accreditation for heat treating does not qualify a supplier for nondestructive testing or chemical processing.

Buyers should verify that a sub-tier processor’s accreditation covers the exact process and facility listed on the PO. The CNC machining supplier remains responsible for ensuring any subcontracted special process is performed by an accredited source and that certification accompanies the lot.

## Material Traceability And Lot Documentation

Full traceability from raw material through finished part functions as a core aerospace requirement. [The traceability chain runs from the raw-material mill heat or lot number through receiving inspection, manufacturing operations, in-process inspection, final inspection, nonconformance records and shipping documentation](https://cnc.bozemetal.com/blog/as9100-certified-titanium-machining-quality-auditing-traceability-standards). Each link requires a documented, auditable record.

A complete aerospace CNC lot documentation package includes:

- Mill certificates with heat and lot numbers traceable to the raw material
- Certificate of conformity
- Inspection reports covering in-process and final inspection
- Special-process certifications for any NADCAP-controlled operations
- Nonconformance disposition records where applicable
- AS9102 FAIR for first-lot deliveries

Material grades commonly specified for aerospace CNC machining include aluminum alloys such as 2024, 6061, 7075 and 7050-T7451, stainless steels, titanium, Inconel and engineering polymers such as PEEK and ULTEM. The drawing and PO govern which grade and specification apply.

Configuration control requires the shop to demonstrate it built to the correct drawing revision. [A frequent AS9100 audit finding at titanium machining suppliers involves a part run to one revision while released documentation sits at another revision](https://cnc.bozemetal.com/blog/as9100-certified-titanium-machining-quality-auditing-traceability-standards). A documented drawing-distribution system with a master list and controlled distribution addresses this risk.

Buyers should confirm documentation deliverables at PO issuance. Gaps discovered at delivery create delays that often require rework or additional processing.

## ITAR/EAR And FAA Production Approval In The Requirement Stack

Export control and aviation production approvals sit on top of the drawing, PO and quality standards. Treating them as interchangeable with AS9100D creates compliance gaps.

**ITAR and EAR** govern the handling of controlled technical data and defense articles. [Under 22 CFR 122.1, any organization that manufactures, exports or temporarily imports a defense article must register annually with DDTC](https://ott.law/blog/export-controls-sanctions-guide-missouri). That obligation starts before manufacturing, not at the first shipment.

[ITAR registration is a precondition to any export or technical-data release but does not authorize exports on its own](https://invariant-ai.com/itar-vs-ear-for-space-companies). Each transfer requires separate authorization.

[For a CNC machining supplier, ITAR/EAR compliance affects the customer drawing, CAD model, CNC program, inspection data and the finished part](https://foxmolds.com/blog/itar-in-manufacturing). Compliance covers the entire data and hardware lifecycle.

[Items outside the USML fall under the Commerce Control List](https://invariant-ai.com/itar-vs-ear-for-space-companies), which [BIS administers](https://research.mit.edu/security-integrity-and-compliance/export-control/export-control-key-concepts/export-control-regulations).

**FAA production approval** relates to the authority to produce aviation articles under 14 CFR Part 21, such as a Parts Manufacturer Approval or Technical Standard Order Authorization. [FAA AC 8120.22B governs production approval procedures](https://faa.gov/regulations_policies/advisory_circulars/index.cfm/go/document.information/documentID/1044439) and serves as the reference for determining whether a manufacturer holds an FAA production approval.

An AS9100D certificate does not substitute for a PMA, TSOA or other applicable Part 21 approval. Buyers sourcing to a production approval holder should confirm how that approval flows down to machined components.

## Qualifying A U.S. CNC Machining Partner

A structured checklist helps align supplier capability with the requirement stack described above.

A practical qualification checklist for a CNC machining aerospace supplier covers:

- Verified AS9100D certificate scope confirmed in OASIS
- ITAR registration status
- Documented AS9102 FAI process and completed FAIR examples
- Special-process flow-down controls and sub-tier accreditation verification
- Material traceability and lot documentation procedures
- Configuration control covering drawing revisions and engineering changes
- Capacity to scale from prototype through sustained multi-shift production

Precision Advanced Manufacturing is an ITAR-registered U.S. manufacturer operating under AS9100D and ISO 9001:2015 quality systems. Every program runs with full documentation, inspection reporting and material certifications.

![A precision machine shop floor with CNC equipment and work cells.](https://cdn.aigrowthmarketer.co/1785163904437-77d81f3f11f5.webp)**Advanced manufacturing: a climate-stable shop floor where multi-axis CNC, turning, and fabrication cells work prototype-to-full-rate volumes.**

Engineering support and manufacturability review are available at the outset of each program. This front-end work protects timelines before production begins.

Integrated capabilities across Precision Advanced Manufacturing’s Anaheim, California and Texas locations include multi-axis CNC machining, precision sheet metal fabrication, specialty welding with thermal distortion control, hardware installation, deburring, brush finishing, laser marking, secondary finishing and kitting. These capabilities reduce handoffs and supplier fragmentation across the requirement stack, from raw material through finished, documented lot.

Programs served include commercial aerospace, military and defense, space and satellites, advanced industrials and UAV. Scalability from prototype through sustained multi-shift production allows programs to transition without supplier changes or documentation gaps.

![A commercial airliner in flight against a blue sky.](https://cdn.aigrowthmarketer.co/1785164215115-cf050b902241.webp)**Aerospace manufacturing for flight-critical hardware — machined and fabricated to AS9100D with the traceability and repeatability commercial airframe programs depend on.**

Predictable performance and measured lead times support program milestones across the full product lifecycle. For brass component considerations in aerospace and defense programs, see [Precision CNC Machining Brass For Aerospace And Defense](https://precisionam.com/articles/precision-cnc-machining-brass/?utm_source=ai-growht-agent&utm_term=cnc-machining-aerospace-parts-requirements).

[Discuss An Upcoming CNC Aerospace Program](https://precisionam.com/request-a-quote/?utm_source=ai-growht-agent&utm_term=cnc-machining-aerospace-parts-requirements)

## Frequently Asked Questions

### What Are The Requirements For CNC Machining Aerospace Parts?

CNC machining aerospace parts requirements are set by the engineering drawing, the purchase order and governing standards including AS9100D, AS9102 and NADCAP. The drawing owns geometry, tolerances, materials and surface finish.

The PO activates quality clauses, documentation deliverables and special-process flow-down. AS9100D governs the supplier’s quality management system, AS9102 governs first article inspection and NADCAP governs special-process accreditation. ITAR registration and FAA production approval apply depending on the program.

### What Is The Difference Between AS9100 And AS9102?

AS9100D is the quality management system standard for aviation, space and defense organizations. It is published by the IAQG and incorporates all ISO 9001:2015 requirements plus aerospace-specific additions.

AS9102 is the first article inspection standard that defines the format and content of the First Article Inspection Report, including Forms 1, 2 and 3 and the ballooned drawing. AS9100D Clause 8.5.1.3 requires first article inspection, and AS9102 specifies how to perform and record it.

### Does A CNC Shop Need FAA Approval Or Just AS9100?

AS9100D certification and FAA production approval serve different purposes. AS9100D certifies a supplier’s quality management system.

FAA production approval, such as a Parts Manufacturer Approval or Technical Standard Order Authorization under 14 CFR Part 21, authorizes a manufacturer to produce specific aviation articles meeting airworthiness standards. Buyers sourcing parts that require FAA approval should confirm the applicable Part 21 authorization separately from the supplier’s QMS certificate.

### How Does ITAR Affect CNC Machining Of Aerospace Parts?

ITAR, administered by the State Department’s DDTC, requires any organization that manufactures, exports or temporarily imports a defense article listed on the U.S. Munitions List to register annually under 22 CFR 122.1. For a CNC machining supplier, ITAR obligations attach to the customer drawing, CAD model, CNC program, inspection data and the finished part.

[Releasing controlled technical data to a foreign person inside the United States constitutes a deemed export requiring authorization](https://invariant-ai.com/itar-vs-ear-for-space-companies). ITAR registration is separate from AS9100D certification and from EAR compliance under BIS.

### Which Special Processes Commonly Require NADCAP Accreditation?

NADCAP, administered by PRI, covers 24 critical process programs. Those most commonly required for aerospace CNC machined parts include heat treating, nondestructive testing, chemical processing such as passivation, etching and conversion coating and coating processes such as anodizing and plating.

NADCAP accreditation is process-specific and facility-specific. The CNC machining supplier is responsible for ensuring any subcontracted special process is performed by an accredited source and that certification accompanies the lot.

## Conclusion: Next Steps For CNC Machining Aerospace Parts Requirements

CNC machining aerospace parts requirements are defined by the engineering drawing, the purchase order and governing standards such as AS9100D, AS9102, NADCAP, ITAR/EAR and applicable FAA approvals. Each document in the stack owns a distinct set of obligations.

Three practical next steps for buyers assembling a requirement package:

- Assemble the full requirement stack for the part, including drawing, applicable specifications, PO quality clauses and any program-specific flow-down requirements.
- Confirm supplier certification scope in OASIS and verify ITAR registration status before issuing an RFQ.
- Request an FAI plan and documentation deliverable list at quote stage, before first-lot delivery.

Precision Advanced Manufacturing’s aerospace specialists can review program requirements, confirm certification scope and develop a tailored quote covering capabilities, tolerances, materials, certifications and production strategy.

[Start A CNC Aerospace Requirements Review](https://precisionam.com/request-a-quote/?utm_source=ai-growht-agent&utm_term=cnc-machining-aerospace-parts-requirements)

## Read Next

- [Aerospace CNC Machining: Tolerances, Materials & AS9100D](https://precisionam.com/articles/precision-cnc-machining-aerospace/)
- [Aerospace CNC Machining: A Technical Buyer’s Guide](https://precisionam.com/articles/aerospace-cnc-machining-buyers-guide/)
- [Precision CNC Machining for Aerospace: A Buyer’s Guide](https://precisionam.com/articles/precision-cnc-aerospace-machining-guide/)
- [CNC Machining Standards for Aerospace and Defense Suppliers](https://precisionam.com/articles/cnc-machining-aerospace-defense-standards/)
- [How to Qualify AS9100 Certified CNC Machining for Aerospace](https://precisionam.com/articles/as9100-certified-cnc-machining-aerospace/)

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---

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## Citations

- [Precision CNC Machining for Aerospace: A Buyer’s Guide](https://precisionam.com/articles/aerospace/precision-cnc-machining-aerospace-guide/)
- [Space Qualified CNC Machining: A Buyer’s Qualification Guide](https://precisionam.com/articles/aerospace/space-qualified-cnc-machining-guide/)
- [ITAR CNC Machining for Military Aircraft: A Supplier Guide](https://precisionam.com/articles/aerospace/itar-cnc-machining-military-aircraft/)
- [Titanium CNC Machining for Aerospace: Grades & Compliance](https://precisionam.com/articles/aerospace/titanium-cnc-machining-aerospace/)
- [Aerospace CNC Machining Lead Times: A Phase-By-Phase Guide](https://precisionam.com/articles/aerospace/aerospace-cnc-machining-lead-times/)

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