Typical OEM expectations around AS9100 fall into a few patterns, but there is no universal rule. What is “required” depends on the OEM, the specific program or prime contractor, the part criticality, and whether you are a direct supplier or a sub-tier.
1. Common OEM patterns for AS9100 expectations
Across large aerospace OEMs and primes, you will usually see one or more of these patterns in supplier requirements:
- AS9100 required for production & special processes: For hardware, assemblies, and special processes (heat treat, coatings, NDT, etc.), AS9100 certification from an accredited CB is often a baseline requirement for approved supplier status.
- AS9100 strongly preferred, ISO 9001 sometimes accepted: Some OEMs will accept ISO 9001 with additional controls (more incoming inspection, higher audit frequency, limited scope of work) for lower-risk commodities or early-stage suppliers.
- Design-responsible work usually requires AS9100: If you hold design authority, do significant engineering changes, or are a build-to-spec supplier, AS9100 (or equivalent aerospace QMS standard) is typically non-negotiable.
- Service and MRO suppliers: For repair and overhaul, AS9110 or OEM-specific repair station approvals may be required in addition to (or instead of) AS9100.
- Distributor and stockist expectations: Distributors may be expected to hold AS9120, but some OEMs accept AS9100 or ISO 9001 with additional traceability and counterfeit-part controls.
These expectations are normally written into the OEM’s supplier quality manual, purchase order quality clauses, and supplier approval criteria. They are often flowed down from customer or regulatory requirements on specific programs.
2. Where AS9100 is typically non-negotiable
AS9100 certification (or an equivalent aerospace QMS standard) is most commonly treated as mandatory in these situations:
- Flight-critical or safety-critical components, including structures, control surfaces, critical fasteners, and engine/hot section hardware.
- Special process providers where OEMs must demonstrate control of process quality, traceability, and personnel qualification.
- Design-responsible or build-to-spec suppliers contributing to type design or major design changes.
- Key or single-source suppliers on certified or defense programs where risk and oversight expectations are higher.
Even here, OEMs sometimes grant temporary or limited approvals to non-certified suppliers when there is no immediate alternative, but these are normally tied to:
- Formal corrective actions and QMS upgrades.
- Defined timelines for achieving AS9100 certification.
- Increased OEM surveillance and more restrictive scopes of work.
3. Where OEMs may allow alternatives
In some cases, OEMs will accept alternatives to full AS9100 certification, with additional controls:
- ISO 9001 with enhanced controls: Often used for non-critical hardware, build-to-print machining, or indirect materials. This usually comes with more incoming inspection, tighter lot acceptance criteria, and higher audit frequency.
- OEM audits in lieu of certification: Small or niche suppliers may be allowed to operate without a formal AS9100 certificate if they pass an OEM QMS audit and accept limited approval or probationary status.
- Program- or customer-specific carve-outs: Some defense or space programs allow specific supplier sets with their own approval rules; in those cases, program control plans and data requirements can matter as much as core certification.
None of these alternatives remove the requirement to actually implement effective processes. OEMs still expect documented procedures, risk-based thinking, configuration control, and robust nonconformance management, regardless of the certificate on the wall.
4. How OEMs actually evaluate suppliers beyond the certificate
Even when AS9100 is listed as a requirement, most OEMs treat it as necessary but not sufficient. They typically look at:
- Audit results and objective evidence: Internal audits, OEM/prime audits, and how well your processes are implemented versus just documented.
- Nonconformance, escapes, and RCCA depth: The strength of your 8D/RCCA, containment speed, and evidence of systematic fixes.
- Traceability and configuration control: Ability to show complete build history, revision control, and change management tied to engineering and planning systems.
- Integration with existing systems: How your QMS and production systems coexist with legacy ERP, MES, PLM, and customer-facing portals and whether that causes data gaps.
- Responsiveness and stability: Capacity, lead-time adherence, supplier OTD, and how you manage changes and disruptions.
For brownfield plants with mixed systems, OEMs are very aware that AS9100-certified suppliers can still have fragmented processes, manual travelers, and weak data integrity. Certification is one input into risk classification, not a guarantee.
5. Tradeoffs and risks for both OEMs and suppliers
From the OEM’s perspective:
- Requiring AS9100 across the board simplifies policy but can shrink the supplier pool, limit innovation, and create capacity constraints.
- Allowing non-certified suppliers can increase supply options but adds audit load, qualification burden, and escape risk.
From the supplier’s perspective:
- Achieving AS9100 opens access to more OEMs and higher-value work but requires investment, ongoing internal audits, and disciplined change control.
- Staying non-certified may be viable in niche or low-risk areas but constrains growth and can keep you in “high-surveillance” status with customers.
In long-lifecycle aerospace programs, OEMs are cautious about swapping suppliers simply for certification reasons because re-qualification, FAI/AS9102 updates, and potential configuration changes carry cost, downtime risk, and documentation overhead. That is why you often see conditional approvals and phased AS9100 adoption expectations rather than abrupt cutoffs.
6. Practical guidance if you are a supplier
If you are trying to understand what a specific OEM expects, you should:
- Review the OEM’s supplier quality manual and purchase order quality clauses for explicit AS9100/AS9110/AS9120 language.
- Clarify with the OEM supplier quality engineer (SQE) how expectations vary by commodity, part criticality, and program.
- Ask whether ISO 9001 plus OEM audit is acceptable short term while you pursue AS9100.
- Plan QMS upgrades with realistic timelines, accounting for validation, system integration, and documentation updates across ERP, MES, and PLM, not just the certification audit.
AS9100 certification is widely expected for serious participation in aerospace supply chains, especially on critical work, but it is only one component of how OEMs assess risk, approve suppliers, and maintain ongoing oversight.
