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View This BlogConfused about the difference between ISO 9001 and AS9100? A clear guide to what each standard covers, the aerospace requirements AS9100 adds and what changes in 2026
Aerospace primes check a public database before they buy from you. ISO 9001 will not get your name on it. AS9100 will.
So, what is the difference between ISO 9001 and AS9100? AS9100 contains every ISO 9001 requirement, then adds over 100 more written for aviation, space and defence. General industry runs on ISO 9001. Supply the aerospace sector, and you need the other one.
This guide covers what each standard is, where they differ and what AS9100 adds. It also covers which one your business needs, how to close the gap, and what changes in 2026. Explore more.
What are ISO 9001 and AS9100?
ISO 9001 is the world’s main quality management system standard, and any organisation in any industry can use it. AS9100 is the aerospace version. Same foundation, same clauses, but written for the companies that design, build and service what flies.
Neither one is a law. Actual aerospace regulation comes from the Civil Aviation Authority and EASA, through production approvals and Part 145 for maintenance. AS9100 is what your customers demand instead, which makes it just as binding.
What is ISO 9001?
The ISO 9001 standard comes from the International Organisation for Standardisation. It is the most widely used quality standard in the world.
The thinking behind it is simple. Keep customers happy, and commit to continual improvement. Certification is your proof that you can deliver what you promised, over and over.
One update is easy to miss. The current edition is ISO 9001:2015, but you also need Amendment 1:2024. It brought climate change into Clauses 4.1 and 4.2; it applied straight away with no transition period, and auditors check it now.
What is AS9100?
AS9100 comes from the International Aerospace Quality Group. Its members are aerospace manufacturers and suppliers from around the world, and the current revision is AS9100D, also written as AS9100 Rev D.
The aerospace industry wrote this standard for itself, so it targets what actually goes wrong in flight-critical work, such as unsafe products, parts nobody can trace, counterfeit components, and suppliers nobody is checking. Ask an aerospace supplier what AS9100 is, and most will say it is the entry ticket for aerospace work.
What are the key differences between ISO 9001 and AS9100?
ISO 9001 is the generic quality standard for any business, while AS9100 contains all of ISO 9001 plus strict rules for aerospace and defence. The differences are scope, who can audit you, and who can see your compliance status. AS9100 adds those rules because aerospace mistakes can kill people.
Scope comes first: AS9100 covers only aviation, space and defence, while ISO 9001 fits any sector. Second, your auditor needs aerospace competence, not general quality experience. Third, visibility: your certificate comes through an aerospace scheme, and your status sits on a public register customers can check.
The quality principles do not change. What changes is how much your quality management system has to prove, and how closely a prime contractor can look before it hands you work.
AS9100 vs ISO 9001:2015 comparison matrix
| Attribute | ISO 9001:2015 | AS9100D |
| Scope | All sectors | Aviation, space and defence |
| Published by | ISO | IAQG |
| Requirements | Base standard | ISO 9001 plus aerospace additions |
| Applies to | Any organisation | Design, production and service suppliers |
| Auditor competence | General quality management | Aerospace qualified auditor |
| Certification scheme | ISO/IEC 17021 | IAQG ICOP scheme, to EN 9104-001 |
| Public register | None | IAQG OASIS database, mandatory |
| Audit depth | Sampling across processes | Deeper sampling, mandatory evidence areas |
| Certificate cycle | Three years, annual surveillance | Three years, annual surveillance |
What additional requirements does AS9100 add?
AS9100 keeps the whole of ISO 9001 and adds over 100 aerospace-specific requirements of its own. They cover product safety, risk management, configuration management, traceability, counterfeit parts, supplier flowdown and critical items. Each one exists because aerospace failures are expensive at best and fatal at worst.
Product safety and risk management
Product safety is a named requirement with named owners. You have to show that your product will not harm anyone while it is in service, and that you have assessed those risks across its whole life.
Risk management goes deeper than ISO 9001. Clause 8.1.1 asks for operational risk management, so the thinking behind risk management in project management applies at process level rather than in a strategic register reviewed once a year.
Foreign object debris prevention comes in here too. You need written procedures, tool control, housekeeping standards and inspection records, with tighter rules wherever debris could reach a fuel system or a flight control. Human factors must be considered when you investigate why something went wrong.
Configuration management and traceability
Configuration management under Clause 8.1.2 means controlling every design, material and production change to a part. You must be able to prove which drawing and which revision applied to the item you shipped.
Traceability is more demanding than most quality systems manage. Records cover raw materials, parts, manufacturing steps and tool calibration, usually down to lot or serial number. If work moves between your sites or out to a subcontractor, control of work transfers applies and counts as a risk itself.
Counterfeit parts and supplier flowdown
Counterfeit parts prevention under Clause 8.1.4 needs a working programme, not a clause in your terms. It covers how you check what suppliers send, how you spot suspect parts and what you do when you find one.
Supplier management goes further than ISO 9001 asks. Supplier flowdown means passing these same aerospace requirements down your own supply chain. You select suppliers on risk, you monitor them on measured performance including on-time delivery, and their approvals become your problem.
Critical items and process verification
Critical items and key characteristics are picked out and controlled individually because they are the features that decide whether the part is safe.
First article inspection follows the AS9102 format. A new or changed part gets a full dimensional check that proves the process, not just that one good part came out. Special processes such as welding, plating and non-destructive testing need validating and approved operators. Nonconforming parts are separated and formally dispositioned.
Which standard does your business need, ISO 9001 or AS9100?
The answer is not about how good your quality system is. It is about who buys from you. For the major primes, AS9100 is not a differentiator. It is the entry requirement, and no amount of ISO 9001 history substitutes for it.
Two sister standards share the same base, and choosing the wrong one is an expensive mistake. AS9110 is for maintenance, repair and overhaul organisations. AS9120 is for stockists and distributors of aerospace parts.
The safest way to settle it is to ask. Primes and tier-one suppliers state the standard they expect in their supplier approval terms, and they will tell you which one applies to your scope of work.
Completing a training on a quality management system will give you a proper insight into which one is the right choice for your business and how to implement it.
ISO 9001 to AS9100 gap analysis: how to close the gap
If ISO 9001 is already running, the work is additive rather than a rebuild. A gap analysis shows where your compliance falls short of the AS9100 requirements, and it is worth running with your certification body rather than on your own.
After that, five things need doing. Train the people affected, since the benefits of training employees show up fastest when the requirements are new to them.
Update your documents and records to capture the new requirements. Widen your internal audit programme to cover the aerospace clauses. Bring suppliers into scope where their approvals matter. Then book the AS9100 certification audit.
Timelines are fairly predictable. If you already hold ISO 9001 certification, the upgrade usually takes three to six months. Starting without a formal quality system, allow nine to twelve months to build it, plus another two to four months for the Stage 1 and Stage 2 audits.
Are ISO 9001 and AS9100 changing in 2026?
Yes, both are. ISO 9001:2026 is targeted for publication in September 2026, with a three-year transition expected, so 2015 certificates stay valid until around September 2029. AS9100 is being revised alongside it and rebranded as IA9100, with publication anticipated between late 2026 and mid 2027.
Four changes are expected in ISO 9001:2026. Leadership gets a stronger emphasis on quality culture and ethics. Risks and opportunities are separated rather than handled together. The standard makes room for hybrid working and for validating software and AI tools. Climate change stays in Clause 4, where Amendment 1:2024 put it.
The aerospace side is a bigger shift than a version number. AS9100, EN 9100 and JISQ 9100 merge into one internationally released document, so the regional prefixes disappear, and IA stands for International Aerospace. AS9110 and AS9120 are being revised too.
IA9100 is also expected to add requirements, not just adopt the new ISO base. Watch for stronger product safety, tighter counterfeit parts controls, supply chain resilience and, for the first time, information security.
None of this is a reason to wait. ISO 9001:2015 with Amendment 1:2024 and AS9100D are the certifiable editions today, and existing certificates carry through the transition, so your compliance is not at risk. Certification bodies also need roughly a year after publication before they can issue certificates against a new edition.
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Get Access NowFAQ
Do you need ISO 9001 before you can get AS9100?
No. AS9100 contains ISO 9001 in full, so AS9100 certification covers ISO 9001 certification too. Starting from nothing, building one system is faster than building ISO 9001 first and extending it later. Holding both certificates is usually pointless, because your AS9100 certificate already proves ISO 9001 conformance.
What are the 7 basic principles of ISO 9001?
They come from ISO 9000: customer focus, leadership, engagement of people, the process approach, improvement, evidence-based decision making and relationship management. Every clause in ISO 9001 traces back to one of them. AS9100 keeps all seven, because it contains ISO 9001 in full rather than replacing it.
What does AS9100 stand for?
AS stands for Aerospace Standard, the designation SAE International uses for the version published in the Americas. Its full title is Quality Management Systems, Requirements for Aviation, Space and Defence Organisations. The IAQG writes the content, and Europe publishes the same requirements under the name EN 9100.
Is AS9100 a QMS?
Not quite. AS9100 is a standard that sets out what your quality management system has to do. The QMS is the system you build to meet it, made up of your processes, records and controls. Certification proves your system meets the standard, not that the standard is your system.
Conclusion
So what is the difference between ISO 9001 and AS9100? ISO 9001 is the general quality standard that works in any industry. AS9100 contains all of it and adds requirements for aviation, space and defence, covering product safety, risk, configuration, traceability, counterfeit parts and supplier control.
The point to take away is who each one is for. ISO 9001 shows you can manage quality. AS9100 shows you can manage it where failure puts lives at risk, which is why the primes will not consider you without it. AS9100 certification covers both.
Both standards change soon. ISO 9001:2026 arrives in September, IA9100 follows it, and certificates issued today stay valid through the transition. Reviewing your quality system against the aerospace requirements now leaves you ready when the new editions land, instead of scrambling when a customer asks.
