In most aerospace and defense supply chains, a distributor can rely on AS9120 as the appropriate standard only when its activities are limited to stockist distribution and related value-added services (e.g., kitting, splitting, limited repack/labeling) and when customers and contracts explicitly accept AS9120.
AS9120 is built on ISO 9001 and tailored for aerospace stockist distributors. AS9100 is broader and intended for organizations that design, manufacture, or substantially alter products. They are related but not interchangeable in all situations.
When AS9120 is generally acceptable for a distributor
AS9120 is usually considered appropriate when the distributor:
- Purchases parts and materials and sells them without design responsibility or complex manufacturing operations.
- Performs only limited value-added services that do not change form, fit, or function (e.g., break-bulk, basic repackaging, labeling, documentation collation, kitting).
- Maintains documented controls for traceability, counterfeit part prevention, storage, preservation, and handling.
- Can show robust document control, lot/batch traceability, and alignment with customer, regulatory, and OEM requirements.
In this scenario, many OEMs and Tier 1s explicitly list AS9120 as an acceptable certification for distributors in their supplier requirements. However, this is by customer choice, not because AS9120 is automatically treated as equivalent to AS9100.
Limits and dependencies
Whether AS9120 is sufficient for your role in the supply chain depends on several factors:
- Contractual requirements: Some customers or primes explicitly require AS9100 for all critical suppliers, regardless of role. If the contract, purchasing specification, or approved supplier list says AS9100, AS9120 alone will not satisfy that requirement.
- Scope of activities: If a distributor starts performing activities that affect form, fit, function, or airworthiness (e.g., machining, assembly, modification, repair), you are moving out of a pure distribution scope. At that point, AS9120 by itself is usually inadequate, and AS9100 or an equivalent manufacturing/repair scope may be expected.
- Regulatory context: For parts under specific regulatory control (e.g., FAA, EASA, military airworthiness authorities), being AS9120-certified does not in itself grant regulatory approval. Additional approvals, procedures, and traceability mechanisms may be required.
- Customer risk posture: Conservative customers may treat high-criticality or flight-safety parts differently. They may require AS9100, additional audits, or dual approvals for distributors handling those items.
In practice, this means you cannot assume that AS9120 will always be accepted in place of AS9100. Each key customer contract should be reviewed, and acceptance should be confirmed explicitly.
What AS9120 does and does not cover
AS9120 focuses on:
- Traceability and records for purchased and sold items.
- Control of suppliers and incoming quality.
- Storage, preservation, and prevention of damage or deterioration.
- Documentation control and certificate of conformity handling.
- Counterfeit part prevention and segregation of suspect/nonconforming items.
It does not substitute for:
- Full production process control, in-process verification, and configuration management expected under an AS9100 production scope.
- Design and development controls for organizations with design responsibility.
- Repair and overhaul process controls typically covered under other sector-specific or regulatory frameworks.
As a result, customers relying on you for distribution and storage can reasonably look to AS9120 for assurance. Customers relying on you as a build-to-print manufacturer, modifier, or repair station typically cannot.
Coexistence with existing systems and brownfield reality
In real operations, distributors often sit between multiple OEMs, MROs, and tiered suppliers, each with their own QMS, ERP, MES, and PLM requirements. Relying on AS9120 in this environment has some practical implications:
- System integration: Your ERP, inventory, and document management systems must support the traceability, shelf-life control, and certificate management required by AS9120 and by each customer. Certification alone does not fix integration gaps.
- Multiple requirement sets: Even with AS9120, major customers may flow down AS9100-style clauses (e.g., documented risk management, FOD control, escape response). You may end up implementing controls similar to AS9100 without formally holding AS9100 certification.
- Change control and long lifecycle: Aerospace parts can remain in service for decades. Your processes and records need to support long-term retrieval and change history regardless of whether you are certified to AS9100 or AS9120.
Attempts to fully replace customer-specific requirements with “we are AS9120 certified” typically fail in aerospace contexts. Customers still expect alignment with their own procedures, approved supplier lists, and regulatory obligations.
Examples where AS9100 may still be required
You should assume AS9120 alone is not sufficient when:
- You operate a distribution business but also run an in-house machine shop or assembly line providing build-to-print or engineered kits.
- You perform modifications or functional testing that affect product performance, not just identification or paperwork.
- You are asked to be treated as a production supplier on an OEM’s AS9100-based supplier approval list.
- Contracts or purchase orders specifically reference AS9100 or tie acceptance to an AS9100-certified scope.
In those cases, you may need a dual approach: AS9100 for manufacturing or modification activities and AS9120 for pure distribution, or a single AS9100 certificate with a clearly defined scope covering both.
Practical steps for distributors
If you are currently AS9120-certified or planning for it, and you want to understand whether you can rely on it instead of AS9100:
- Review your actual activities and confirm whether anything goes beyond stockist distribution and non-intrusive value-added work.
- Map customer, regulatory, and OEM requirements against your AS9120 controls to identify gaps.
- Confirm with key customers in writing whether AS9120 is acceptable for your current and planned scope.
- Ensure your ERP/inventory and QMS workflows support long-term traceability, document control, and change management required for aerospace parts.
- If you plan to expand into manufacturing or modification, evaluate early whether AS9100 certification, or a separate entity with an AS9100 scope, will be needed.
In summary, a distributor can often rely on AS9120 rather than AS9100, but only where the scope is limited to distribution and where customers and contracts explicitly accept AS9120. It is not a universal substitute, and it does not override customer, regulatory, or integration realities in complex aerospace supply chains.
