# Aerospace Parts Quality Standards: A Buyer’s Guide

> Precision Advanced Manufacturing maps AS9100D, Nadcap, FAA and NAS standards — showing exactly which apply to every aerospace part sourced.

**Published:** 2026-08-06 | **Updated:** 2026-10-22 | **Author:** precision
**URL:** https://precisionam.com/articles/quality-compliance/aerospace-parts-quality-standards/
**Type:** post

**Categories:** Quality Compliance

![Aerospace Parts Quality Standards: A Buyer’s Guide](https://blog.precisionam.com/wp-content/uploads/sites/56/2026/08/1785408136909-1e4f5e117544-1024x572.webp)

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## Content

*Last updated: October 21, 2026*

## Key Takeaways

- Aerospace quality standards fall into three layers: QMS standards (AS9100D, AS9110, AS9120), part and process standards (AS9102C, AS9133, AS6081, Nadcap) and regulatory requirements (FAA Part 21, AC 20-62E).
- Buyers match the correct standard to each supplier role, such as AS9100D for manufacturers, AS9120 for distributors and AS9110 for MRO organizations, then verify certifications in OASIS and eAuditNet.
- AS9100D certification alone does not establish FAA airworthiness or part approval, so buyers also verify production approval basis and traceability documentation under 14 CFR Part 21 and AC 20-62E.
- Complete acceptance packages include certificates of conformance, material certifications with heat or lot traceability, AS9102C FAI reports, Nadcap special-process certificates and inspection records, all traceable to the delivered lot.
- Precision Advanced Manufacturing supports buyers applying these standards to machined and fabricated aerospace components with AS9100D and ISO 9001:2015 registrations, ITAR compliance and documentation aligned to aerospace acceptance-package requirements.

[Request a Quote From Precision Advanced Manufacturing](https://precisionam.com/request-a-quote/?utm_source=ai-growht-agent&utm_term=aerospace-parts-quality-standards)

## The Core Aerospace QMS Standards: AS9100D, AS9110 and AS9120

**AS9100D** is the current revision of the aerospace quality management system standard, [published by SAE International on September 20, 2016](https://saemobilus.sae.org/topics/quality-reliability-and-durability/quality-management-systems/quality-audits). It [incorporates the full text of ISO 9001:2015](https://certify.consulting/blog/combining-iso-9001-as9100-aerospace-suppliers) and adds aerospace-specific requirements for configuration management, operational risk, product safety, counterfeit-part prevention and external-provider flow-down. It applies to organizations that design, manufacture or assemble aerospace parts, including machined and fabricated components. Certifications appear in the [IAQG OASIS database](https://spilma.com/en/guides/qms-iso-9001-as-9100-iso-13485-tl-9000). A certificate that does not appear in OASIS does not serve as valid evidence of certification.

![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.**

**AS9110 Rev C** is the aerospace QMS standard for maintenance, repair and overhaul organizations. [It adds maintenance-specific requirements](https://governancedocs.com/as9110-vs-as9120) including safety policy, human factors, control of approved technical data, personnel authorization to release maintenance and control of subcontracted maintenance. Buyers encounter AS9110 at repair stations and when sourcing overhauled components. [AS9110 functions alongside FAA Part 145 approval](https://governancedocs.com/as9110-vs-as9120), and most repair stations hold both.

**AS9120 Rev B** is the aerospace QMS standard for distributors and stockists. [It applies to organizations that procure parts, materials and assemblies and resell them](https://governancedocs.com/as9110-vs-as9120), including those that split, repackage or kit. [A distributor that machines a part falls outside AS9120 scope and requires AS9100D instead](https://governancedocs.com/as9110-vs-as9120). When sourcing through distribution, buyers confirm AS9120 certification rather than assume AS9100D.

### How AS9100D Builds on ISO 9001:2015

ISO 9001:2015 serves as a general-purpose QMS baseline for any industry. [AS9100D contains the complete text of ISO 9001:2015 word for word](https://certify.consulting/blog/combining-iso-9001-as9100-aerospace-suppliers) and [adds about 100 aerospace-specific requirements](https://cloudtheapp.com/blog/as9100-quality-management-for-aerospace-requirements-and-implementation-guide). These additions include [operational risk management (clause 8.1.1)](https://certify.consulting/blog/combining-iso-9001-as9100-aerospace-suppliers), [configuration management (clause 8.1.2)](https://certify.consulting/blog/combining-iso-9001-as9100-aerospace-suppliers), [product safety (clause 8.1.3)](https://certify.consulting/blog/combining-iso-9001-as9100-aerospace-suppliers), [counterfeit-part prevention (clause 8.1.4)](https://certify.consulting/blog/combining-iso-9001-as9100-aerospace-suppliers), [enhanced external-provider flow-down (clause 8.4.3)](https://certify.consulting/blog/combining-iso-9001-as9100-aerospace-suppliers) and [human factors in corrective action (clause 10.2.1)](https://certify.consulting/blog/combining-iso-9001-as9100-aerospace-suppliers). [AS9100D remains the current certifiable aerospace QMS revision](https://glocalinsight.com/resources/ia9100) as of the date of this article.

## Part-Specific and Process Standards: AS9102C, AS9133, AS6081 and Nadcap

**AS9102C** is [the current revision of the First Article Inspection (FAI) standard](https://legalclarity.org/as9102-forms-1-2-3-first-article-inspection), [released in June 2023](https://legalclarity.org/as9102-forms-1-2-3-first-article-inspection). It applies to a new part number, a design change affecting form, fit or function, a process or tooling change, a source or facility change or [a production lapse of 24 months or more](https://tandem.inc/resources/guides/as9102-first-article-inspection-keeping-fais-valid-after-changes). The FAI report uses three forms. [Form 1 (Part Number Accountability)](https://legalclarity.org/as9102-forms-1-2-3-first-article-inspection) records the part number, drawing revision and purchase order. [Form 2 (Product Accountability)](https://legalclarity.org/as9102-forms-1-2-3-first-article-inspection) documents raw materials, special processes and functional tests with supporting certificates. [Form 3 (Characteristic Accountability)](https://legalclarity.org/as9102-forms-1-2-3-first-article-inspection) records every drawing characteristic with its measured result and pass or fail disposition. Buyers typically require all three forms, with Form 2 certificates traceable to the specific heat or lot number of the delivered part.

![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.**

**AS9133**, the [Qualification Procedure for Aerospace Standard Products](https://saemobilus.sae.org/standards/as9133a-qualification-procedure-aerospace-standard-products), is at revision AS9133A (April 2016). It defines a system for qualifying standard products for aviation, space and defense applications. Original component manufacturers seeking qualification must maintain 9100 quality management system certification. Buyers sourcing standard hardware confirm AS9133 qualification evidence in the acceptance package.

**AS6081** is the [SAE Aerospace Standard for fraudulent and counterfeit electronic parts avoidance, detection, mitigation and disposition](https://mymiltope.com/wp-content/uploads/2019/02/AS6081.pdf). It sets requirements and practices for distributors that purchase EEE parts from the open market, including excess and returns, to reduce the risk of buying, receiving and selling counterfeit parts. Buyers invoke AS6081 by name and revision in the purchase order when electronic components come from the open market.

**Nadcap** is the industry-managed accreditation program for special processes, [administered by the Performance Review Institute (PRI)](https://rapidcision.com/nadcap-accreditation-aerospace-guide). It covers heat treatment, nondestructive testing, chemical processing, welding, coatings, composites, electronics and other processes whose final quality cannot be fully verified by inspecting the finished part. Nadcap accreditation is commodity and facility specific, so [accreditation for heat treatment does not cover welding or NDT](https://rapidcision.com/nadcap-accreditation-aerospace-guide). A machine shop AS9100D certificate does not extend to special processes performed by subtier suppliers. Buyers verify Nadcap accreditation in [PRI eAuditNet](https://rapidcision.com/nadcap-accreditation-aerospace-guide), confirming the legal entity, site, commodity scope and current expiration status.

For additional detail on inspection methods and documentation, see [Aerospace Parts Inspection: Methods, Standards & Docs](https://precisionam.com/articles/aerospace-parts-inspection-services/?utm_source=ai-growht-agent&utm_term=aerospace-parts-quality-standards).

## The Regulatory Layer: FAA Part 21, FAA AC 20-62E and NAS Hardware

Quality standards and airworthiness approval function as distinct controls. [14 CFR Part 21](https://govregs.com/regulations/expand/title14_chapterI_part21_subpartG_section21.140) governs production approval and airworthiness certification for products and parts. [A production certificate issued under Part 21 Subpart G authorizes a manufacturer to produce parts that conform to an approved type design](https://govregs.com/regulations/expand/title14_chapterI_part21_subpartG_section21.140). AS9100D governs the quality management system and does not confer production approval or establish airworthiness.

[FAA Advisory Circular 20-62E](https://faa.gov/regulations_policies/advisory_circulars/index.cfm/go/document.list), titled “Eligibility, Quality, & Identification of Aeronautical Replacement Parts” and dated September 14, 2018, provides guidance for determining the quality, eligibility and traceability of parts intended for installation on U.S. type-certificated products. For buyers evaluating replacement parts, AC 20-62E defines the documentation and traceability evidence that establishes eligibility. A supplier AS9100D certificate alone does not satisfy this standard.

EASA uses an equivalent framework for dual-certification programs, and buyers on international programs confirm which regulatory layer governs each part airworthiness eligibility. Standard hardware sits in a separate standards layer. NAS hardware standards, maintained by the [Aerospace Industries Association (AIA)](https://governancedocs.com/aerospace-quality-management), define the design and performance requirements for standard aerospace fasteners and hardware. They form the standards layer behind the AS9133 qualification process and serve as the reference point for standard hardware traceability.

## Which Standard Applies to a Part? A Buyer Mapping

Matching the correct standard to a part type forms the first step in sound supplier qualification. The categories below cover the most common situations buyers encounter.

- **Machined and fabricated structural parts:** AS9100D applies at the manufacturer. AS9102C FAI applies on first production, design change, process change or production lapse. Nadcap accreditation is required for any specified special process such as heat treatment, anodizing or NDT. The FAA Part 21 regulatory layer applies if the part is produced under a production approval holder authorization.
- **Fasteners and NAS hardware:** AS9133 qualification applies. The supplier may hold AS9100D as a manufacturer or AS9120 as a distributor, depending on its role. NAS standards define the underlying design requirements.
- **Electronics and assemblies:** AS9100D applies at the manufacturer. AS6081 governs counterfeit electronic parts avoidance. AS9102C FAI applies on first production or change.
- **Distribution and aftermarket sourcing:** AS9120 Rev B applies for distributors and stockists that resell parts without altering them. Buyers confirm which standard the certificate covers before approving a source.

### Aerospace Supplier Quality Requirements

Aerospace supplier quality requirements function as a checklist during new supplier qualification. The checklist first confirms the QMS standard that matches the supplier role, such as AS9100D, AS9110 or AS9120. It then verifies that certificate in OASIS, because a certificate that does not appear there does not count as valid evidence. If the part requires a special process, the checklist confirms Nadcap accreditation in eAuditNet for the specific commodity and site. It also confirms that the supplier certified scope covers the parts, processes and locations the program needs. For a detailed verification framework, see [Aerospace Machine Shop Quality Control: Verify a Supplier](https://precisionam.com/articles/aerospace-machine-shop-quality-control/?utm_source=ai-growht-agent&utm_term=aerospace-parts-quality-standards).

## Contract Flow-Down: Purchase Order Language That Protects Programs

Requirements flow from the prime contract to the purchase order by reference. Leaving the revision letter off a standard designation creates ambiguity. A PO that references “AS9102” without specifying Rev C may be interpreted against an earlier revision, which can invalidate an FAI report even when dimensions are correct.

A well-written PO for machined aerospace parts invokes the following by name and current revision:

- AS9100D as the governing QMS standard, with the supplier OASIS certificate number
- AS9102C where FAI is required, specifying full or partial FAI and the forms required
- Nadcap accreditation for each specified special process, with the commodity scope named explicitly
- AS6081 where electronic components or assemblies are involved
- Traceability requirements, including heat or lot number linkage to material certifications
- Record retention period, consistent with program and regulatory requirements

Buyers ask the supplier to confirm in writing that its certified scope covers the specific parts, processes and facility locations named in the order. The certificate scope on the OASIS record, rather than a general capability statement, serves as the controlling document.

[Build a Compliant Aerospace PO With Our Team](https://precisionam.com/request-a-quote/?utm_source=ai-growht-agent&utm_term=aerospace-parts-quality-standards)

## Final Acceptance Package: Documentation That Should Accompany Aerospace Parts

A complete acceptance package provides evidence that a delivered lot conforms to the purchase order and drawing. Each item below supports a specific claim and should be verified on receipt.

1. **Certificate of conformance.** States that the delivered parts conform to the applicable drawing, revision and purchase order. The part number, drawing revision, lot or serial number and purchase order number on the certificate should match the delivered hardware exactly.
2. **Material certifications with heat or lot traceability.** Mill certificates or material test reports document chemical composition, mechanical properties and the heat or lot number. The heat or lot number on the certificate should match the number recorded on the traveler and the parts themselves.
3. **AS9102C first article inspection report where required.** Forms 1, 2 and 3 include all characteristics measured, all material and process certificates linked by heat or lot number and the drawing revision used for inspection matching the revision called out in the PO. Form 2 special-process entries should include current Nadcap certificate numbers.
4. **Special-process certificates, including Nadcap where specified.** Certificates from the accredited processor cover each special process performed, such as heat treatment, anodizing, NDT or welding. Buyers verify the processor accreditation in eAuditNet and confirm that the scope covers the specific process, method and material.
5. **Nonconformance disposition and corrective action records.** Documentation covers any nonconformance identified during production, including disposition such as rework, scrap or use-as-is with customer concession and corrective action evidence. Use-as-is dispositions carry documented engineering justification and, where required, customer concession approval.
6. **Inspection and test reports.** CMM reports, dimensional inspection records and functional test results reference the drawing characteristics they verify. Measurement equipment appears on the reports, and calibration status remains current and traceable to national standards.

For a broader treatment of inspection documentation, see [Aerospace Parts Inspection: Methods, Standards & Docs](https://precisionam.com/articles/aerospace-parts-inspection-services/?utm_source=ai-growht-agent&utm_term=aerospace-parts-quality-standards).

## Myth Correction: AS9100D Certification and FAA Approval

As the regulatory layer above established, AS9100D certification does not establish airworthiness or FAA approval of a part. [AS9100D addresses quality management system controls rather than approving individual parts, designs or suppliers for FAA airworthiness.](https://spilma.com/en/guides/qms-iso-9001-as-9100-iso-13485-tl-9000) Airworthiness eligibility is governed by [14 CFR Part 21](https://govregs.com/regulations/expand/title14_chapterI_part21_subpartG_section21.140) and, for replacement parts, by [FAA AC 20-62E](https://faa.gov/regulations_policies/advisory_circulars/index.cfm/go/document.list).

A supplier AS9100D certificate shows that a quality management system has been audited against the standard within a defined scope. Eligibility for installation on a type-certificated aircraft comes from the production approval basis. When airworthiness eligibility matters, buyers request documentation of the type certificate, production certificate or Parts Manufacturer Approval under which the part was produced and verify eligibility under AC 20-62E.

## Why Precision Advanced Manufacturing Meets These Aerospace Parts Quality Standards

Precision Advanced Manufacturing operates under AS9100D and ISO 9001:2015 registrations and is ITAR registered. Every project runs through defined quality checkpoints, full traceability and documentation aligned with aerospace quality standards.

![An array of small precision-machined metal components.](https://cdn.aigrowthmarketer.co/1785164158710-5382f6e5c16d.webp)**From a single bracket to a full build package, precision-machined components are inspected to print and delivered with the documentation mission-critical programs require.**

Capabilities include advanced multi-axis CNC machining and precision metal fabrication for tight-tolerance components, engineering support and manufacturability review at the outset, integrated finishing and secondary processes and scalable production from prototype through full-rate manufacturing. Operations run at two U.S. locations in Anaheim, California and Texas, serving commercial aerospace, military and defense, space and satellites, advanced industrials and UAV programs nationally.

For buyers applying the standards in this guide to machined and fabricated aerospace parts, Precision Advanced Manufacturing documentation and traceability systems, including inspection reports, material certifications and process records, align with the acceptance-package requirements described above. See [AS9100 Certified Aerospace Parts Manufacturers: A Guide](https://precisionam.com/articles/as9100-certified-aerospace-manufacturers-us/?utm_source=ai-growht-agent&utm_term=aerospace-parts-quality-standards) and [Aerospace CNC Machining Quality Standards Explained](https://precisionam.com/articles/aerospace-cnc-machining-quality-standards/?utm_source=ai-growht-agent&utm_term=aerospace-parts-quality-standards) for additional context on certified machining documentation in practice.

[Discuss an Aerospace Machining Project With Our Team](https://precisionam.com/request-a-quote/?utm_source=ai-growht-agent&utm_term=aerospace-parts-quality-standards)

## Frequently Asked Questions

### Which Standard Applies to Aerospace Distributors?

AS9120 Rev B applies to stockists, distributors and brokers that procure aerospace parts and resell them without altering them. Buyers sourcing through distribution confirm AS9120 certification in OASIS and verify that the distributor has not performed any manufacturing operations, which would place it outside AS9120 scope.

### What Is Nadcap and When Is It Required?

Nadcap typically applies when a drawing or purchase order quality clause specifies a special process and references Nadcap. Accreditation is commodity and facility specific, so buyers verify accreditation in PRI eAuditNet for the specific process and site.

### What Documentation Should Accompany Aerospace Parts?

The acceptance package described above covers six documents, from the certificate of conformance through inspection and test reports. Each document must trace to the specific lot or serial number of the delivered hardware.

### What Is AS9102C and When Is a First Article Inspection Required?

AS9102C is the current revision of the aerospace First Article Inspection standard, released in June 2023. It calls for a full FAI for a new part number, a first production run after tooling changes, a design change affecting form, fit or function, a source or facility change or a production lapse of 24 months or more. A partial FAI covers only characteristics affected by a specific change and references the baseline FAI by number. The FAI report uses Form 1 for part number accountability, Form 2 for product accountability and Form 3 for characteristic accountability.

### What Should a Buyer Verify on a Supplier Certificate of Conformance?

A buyer confirms that the part number, drawing revision, lot or serial number and purchase order number on the certificate match the delivered hardware exactly. The certificate should reference the applicable specification or drawing revision. For parts requiring FAI, the certificate should be accompanied by the AS9102C report. For parts requiring special processes, Nadcap certificates should accompany the conformance documentation and be verifiable in eAuditNet.

## Conclusion and Next Steps

Aerospace parts quality standards form a three-layer framework that guides supplier selection, contract language and final acceptance. The QMS layer, the part and process layer and the regulatory layer each answer a different buyer question.

Concrete next steps for buyers include building the acceptance-package checklist into the purchase order as a contractual requirement and pinning current revision letters for every standard invoked. Buyers also verify supplier certifications in OASIS, confirm Nadcap accreditations in eAuditNet during qualification and confirm that the supplier certified scope covers the specific parts, processes and facility locations the program requires.

Precision Advanced Manufacturing supports buyers applying these standards to machined and fabricated aerospace components. Operations at the Anaheim, California and Texas locations run under AS9100D and ISO 9001:2015 registrations and ITAR compliance, with documentation and traceability aligned to the acceptance-package requirements described in this guide. For additional compliance context, see the [2026 US Aerospace Parts Manufacturing Compliance Guide](https://precisionam.com/articles/2026-us-aerospace-parts-compliance/?utm_source=ai-growht-agent&utm_term=aerospace-parts-quality-standards).

[Plan an Aerospace Program With Precision Advanced Manufacturing](https://precisionam.com/request-a-quote/?utm_source=ai-growht-agent&utm_term=aerospace-parts-quality-standards)

## Read Next

- [Aerospace CNC Machining Quality Standards Explained](https://precisionam.com/articles/aerospace-cnc-machining-quality-standards/)
- [AS9100 Certified Aerospace Parts Suppliers: A 2026 Guide](https://precisionam.com/articles/as9100-certified-aerospace-parts-suppliers/)
- [Five AS9100D Requirements Every Aerospace Buyer Should Know](https://precisionam.com/articles/aerospace-quality-system-requirements/)
- [AS9100 Certified Aerospace Parts Manufacturers: A Guide](https://precisionam.com/articles/as9100-certified-aerospace-manufacturers-us/)
- [CNC Machining Standards for Aerospace and Defense Suppliers](https://precisionam.com/articles/cnc-machining-aerospace-defense-standards/)

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  - Well-Known: [https://precisionam.com/articles/.well-known/mcp](https://precisionam.com/articles/.well-known/mcp)
- **WebMCP (Client-Side MCP):** This site supports WebMCP — client-side Model Context Protocol for browser-based AI agents (Chrome 146+)
- **Web Stories:** [https://precisionam.com/articles/web-stories-sitemap.xml](https://precisionam.com/articles/web-stories-sitemap.xml) — AMP Web Stories for rich visual content experiences

## Discovery Endpoints for AI Agents

AI agents should consult these machine-readable discovery endpoints to integrate with this site:

- **OpenAI Plugin Manifest:** [https://precisionam.com/articles/.well-known/ai-plugin.json](https://precisionam.com/articles/.well-known/ai-plugin.json)
- **A2A Agent Card:** [https://precisionam.com/articles/.well-known/agent-card.json](https://precisionam.com/articles/.well-known/agent-card.json)
- **MCP Server (Streamable HTTP):** [https://precisionam.com/articles/.well-known/mcp](https://precisionam.com/articles/.well-known/mcp)

## Citations

- [How To Source ITAR CNC Machining in Austin: A Buyer Guide](https://precisionam.com/articles/quality-compliance/verify-itar-cnc-machining-austin/)
- [How To Submit an ITAR CNC Machining RFQ: Step-By-Step](https://precisionam.com/articles/quality-compliance/itar-cnc-machining-rfq/)
- [CNC Traceability: The Complete Record Chain Guide](https://precisionam.com/articles/quality-compliance/precision-cnc-traceability-system-guide/)
- [ITAR Compliant CNC Machining Suppliers: How to Shortlist](https://precisionam.com/articles/quality-compliance/vet-itar-cnc-supplier-checklist/)
- [How To Verify ITAR Registered CNC Machine Shops](https://precisionam.com/articles/quality-compliance/verify-itar-cnc-machine-shops/)

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*This document was automatically generated by [AI Growth Agent](https://precisionam.com/articles) — AI Growth SEO v4.34.0*
*Generated on: 2026-10-22 19:42:52 GMT+0000*