Can You Legally Fly with an Overdue AD Under Part-ML?

This article is for owner-pilots and operators under EASA Part-ML who need a clear answer: can you legally fly with an overdue Airworthiness Directive (AD)? In normal operation, the answer is no — once the compliance date for a mandatory AD has passed and you have not complied (and have no authorised deferral), you may not fly until the AD is complied with. Exceptions exist only where the AD or the competent authority explicitly allow deferral or where a one-time ferry flight is permitted under strict conditions. Below we set out the regulatory context, practical interpretation, and risk.

1. Regulatory Context

Airworthiness Directives (ADs) are issued by the competent authority and are mandatory for the affected aircraft. Under Part-ML and ML.A.201, the owner is responsible for ensuring that all applicable ADs are complied with within the compliance time specified in each AD. Flying with an overdue mandatory AD (i.e. past the compliance date without compliance or an authorised deferral) means the aircraft is not in a condition for safe operation in compliance with the law.

The legal basis is Commission Implementing Regulation (EU) No 1321/2014 (Part-ML) and the EU/national rules that make ADs mandatory. EASA’s continuing airworthiness and Part-ML define the framework. For a clear explanation of AD vs SB and owner responsibility, see AD vs SB – What Every Owner Must Understand. Some ADs are mandatory (must be complied with); others may be recommended or have a “recommended” compliance option — only the AD text and the competent authority’s position define this.

2. Practical Interpretation

Mandatory vs recommended: If the AD states that compliance is mandatory, you must comply within the compliance time (or within any permitted deferral). If the AD offers a recommended alternative or is explicitly non-mandatory, national and EU rules still apply; treat any “recommended” path only as permitted when the AD and the authority clearly allow it.

Deferred AD conditions: Some ADs allow deferral of compliance under defined conditions (e.g. a limited number of flight hours or cycles, or a later date). Deferral must be explicitly permitted by the AD (or by the competent authority) and documented. You cannot self-authorise a deferral unless the AD or the authority provides for it.

Ferry flights: Some regulations permit a ferry flight (e.g. to a maintenance facility) with an otherwise overdue AD under strict conditions (e.g. special permit, limitations, one-time flight). Such flights are the exception and require explicit authority approval or a clear regulatory provision; they do not constitute normal operation.

3. Decision Tree

Can I fly with an overdue AD?

• Is the AD mandatory?
  • Yes → You must comply (or have an authorised deferral) before the compliance date. After the compliance date, you may not fly for normal operation until the AD is complied with (unless a ferry or other exception applies and is authorised).
• Is the AD recommended only?
  • Check the AD and national rules. If it is truly non-mandatory, operation may be permitted, but the owner must still manage risk and document the decision. When in doubt, treat as mandatory or seek competent authority guidance.

Do I have a permitted deferral?

• Only if the AD itself (or the competent authority) allows deferral and you operate within those limits (e.g. hours, cycles, or date). Document the deferral and ensure you do not exceed it.

What about a ferry flight?

• Only if national/EU rules or the competent authority allow a one-time ferry flight with the overdue AD, under specified limitations (e.g. to a repair station). Do not assume ferry permission without checking.

4. Risk Analysis

Legal risk: Flying with an overdue mandatory AD is a breach of continuing airworthiness requirements. It can lead to enforcement action, grounding, and liability in the event of an incident. Insurance may also be affected.

Who is liable? The owner (ML.A.201) and the pilot-in-command for the decision to fly. The certifying staff who last released the aircraft are not responsible for the owner’s AD compliance unless they were contracted to manage ADs and failed to do so within that role.

How do findings occur? Audits and ramp checks verify AD applicability and compliance dates. An overdue mandatory AD with no authorised deferral is a direct finding and typically results in the aircraft being considered not airworthy until compliance is achieved.

5. FAQ

Can I fly with an overdue AD?

For a mandatory AD: No, for normal operation, once the compliance date has passed and you have not complied (and have no authorised deferral). You must complete the AD compliance (and obtain a CRS if required) before further flight, unless a specific exception (e.g. authorised ferry) applies. For recommended-only ADs, the AD and national rules define what is allowed; when in doubt, comply or seek authority guidance.

What about ferry flights?

Some states allow a one-time ferry flight to a maintenance facility with an overdue AD under strict conditions (e.g. special flight permit, limitations, daylight VFR). This is an exception, not a general permission. Check your national regulations and the competent authority; do not assume ferry is allowed without confirmation.

Who decides if an AD is mandatory?

The competent authority that issues the AD (e.g. EASA, NAAs) states in the AD whether compliance is mandatory or recommended. The AD applicability (aircraft model, S/N, registration) also defines whether it applies to your aircraft. The owner is responsible for establishing applicability and complying. See How to Know If Your Aircraft Is Airworthy Today and 12 Most Common Part-ML Audit Findings.

Summary: For a mandatory AD, you may not fly in normal operation once the compliance date has passed without compliance or an authorised deferral. Deferral and ferry flights are exceptions that must be explicitly permitted by the AD or the competent authority. The owner remains responsible for AD applicability and compliance; when in doubt, comply or seek authority guidance.