Definition
In the EASA system, the legally binding rules are the Implementing Regulations and Delegated Regulations adopted by the European Commission — often called the Implementing Rules, or IR. These rules state what must be achieved but frequently leave open how to achieve it. To bridge that gap, EASA issues two categories of soft-law material alongside each Part-regulation: Acceptable Means of Compliance (AMC) and Guidance Material (GM).
An Acceptable Means of Compliance is a method that EASA has determined will satisfy a given Implementing Rule. AMC is not itself mandatory. However, it is "compliant by default": an organization that follows the published AMC is presumed to meet the corresponding rule, and the competent authority will accept it without further justification. This gives AMC enormous practical weight even though it is technically non-binding.
Guidance Material is different again. GM does not establish a means of compliance; it explains. It provides interpretation, background, examples, and clarification to help organizations and authorities understand what a rule or an AMC actually means. GM never creates an obligation on its own.
The third piece of the picture is the Alternative Means of Compliance, or AltMoC. Because AMC is only one accepted method rather than the only method, an organization may propose its own way of meeting an Implementing Rule. When it does, that alternative is an AltMoC, and it must be assessed and approved by the competent authority before use. The organization has to demonstrate that its method achieves an equivalent level of safety to the published AMC. This flexibility is a defining feature of the EASA framework: the binding obligation is fixed, but the path to it is negotiable with regulator approval.
The closest concept in the FAA system is the Advisory Circular. Like AMC and GM, an Advisory Circular is non-regulatory and describes an acceptable — but not the only — way to comply with a Federal Aviation Regulation. The parallel is close but not exact: EASA formally separates the "acceptable method" function (AMC) from the "explanation" function (GM), whereas a single Advisory Circular often serves both purposes at once. It is also worth stressing that neither AMC, GM, nor an Advisory Circular is the law itself — the binding text is the Implementing Rule in Europe and the Federal Aviation Regulation in the United States.
This is why Approved Training Organizations, CAMOs, and operators cite AMC extensively in their expositions and operations manuals. By writing procedures that follow the relevant AMC, an organization can show its competent authority a clear, pre-accepted path to compliance and avoid the burden of justifying a bespoke method from scratch.
Why It Matters for Flight Schools
For a flight school or maintenance organization, knowing the difference between IR, AMC, GM, and AltMoC is the difference between confident compliance and wasted effort. Building an exposition around published AMC is the low-friction route to approval, because the competent authority already accepts it. Deviating from AMC is entirely legitimate, but it converts the deviation into an AltMoC that must be documented and approved, which takes time and evidence.
Misreading the status of these documents causes real problems. Treating GM as if it were mandatory can burden a school with obligations it does not actually have, while treating AMC as optional and quietly deviating without an approved AltMoC can produce an audit finding. Because EASA revises AMC and GM more frequently than the binding rules themselves, organizations must also track which edition of the soft law they have built their manuals against.
How Aviatize Handles This
Aviatize's Compliance & Auditing module lets a school link each procedure in its exposition or operations manual to the specific Implementing Rule it satisfies and to the AMC it follows, so an auditor can trace a procedure straight to its regulatory basis. Where a school uses an approved Alternative Means of Compliance, that status and its approval can be recorded against the relevant requirement rather than living in a separate file.
When AMC or GM is updated, the Digital Data & Records module keeps manual versions and their supporting evidence organized, so the school can identify which internal documents reference the changed material and review them, rather than discovering a stale citation during an inspection.
Frequently Asked Questions
- What is the difference between AMC and GM in EASA rules?
- An Acceptable Means of Compliance (AMC) is a method EASA accepts as satisfying a binding rule — follow it and you are presumed compliant. Guidance Material (GM) does not establish a means of compliance; it only explains and illustrates how a rule or AMC should be understood. Neither is mandatory in itself.
- Is AMC legally binding?
- No. Only the Implementing Rules are legally binding. AMC is non-binding but is compliant by default, so an organization that follows it is accepted without further justification. An organization may instead use an approved Alternative Means of Compliance (AltMoC) demonstrating an equivalent level of safety.
- Is EASA AMC the same as an FAA Advisory Circular?
- They are close analogues — both are non-regulatory and describe an acceptable, but not the only, way to comply. The main difference is that EASA separates the accepted method (AMC) from the explanation (GM), while a single FAA Advisory Circular often serves both roles at once. In both systems the binding text is the rule, not the guidance.