Pilot-Owner Maintenance Under ML.A.803 – What You Can (and Cannot) Sign

Under EASA Part-ML, ML.A.803 allows the owner who is also the pilot to perform and certify certain maintenance tasks — but only those explicitly listed in the approved or declared Aircraft Maintenance Programme (AMP). Pilot-owner sign-off is not a Certificate of Release to Service (CRS); it is a separate type of record. This article explains what you can and cannot sign as pilot-owner, how to stay within scope, and the documentation and risk of overstepping.

1. Regulatory Context

EASA Part-ML defines pilot-owner maintenance in ML.A.803. The regulation allows the owner who is also the pilot to perform certain maintenance tasks and to certify their completion only when those tasks are explicitly permitted by the Aircraft Maintenance Programme (AMP) and within the limits set by the competent authority.

Key points from the regulatory framework:

• ML.A.803 specifies that pilot-owner maintenance is limited to tasks included in the approved or declared AMP (see ML.A.302).
• The scope is not left to the owner’s discretion: only tasks that the AMP (typically in an appendix, e.g. “Pilot-Owner Maintenance Tasks” or equivalent) lists as eligible may be carried out and signed by the pilot-owner.
• Pilot-owner certification does not constitute a Certificate of Release to Service (CRS) under ML.A.801. A CRS is issued by appropriate certifying staff (Part-66 or equivalent); the pilot-owner entry is a different type of record.

The official Commission Implementing Regulation (EU) No 1321/2014 (Part-ML) and EASA’s Part-ML regulatory material are the authoritative sources for the exact wording and any amendments.

2. Practical Interpretation

What “signing” as pilot-owner means

When you perform a task as pilot-owner under ML.A.803, you are recording that the task was done in accordance with the AMP. You are not issuing a CRS. The legal effect is that the task is documented as completed for the purpose of the AMP and continuing airworthiness records; it does not transfer responsibility for airworthiness to Part-66 certifying staff unless a separate CRS is required and issued.

Allowed vs prohibited tasks

The following table summarises the typical split. The actual list for your aircraft is defined only in your AMP (declared or approved).

Rule of thumb: If the task is not explicitly listed in your AMP as a pilot-owner task, you cannot sign it as pilot-owner. In case of doubt, the task must be performed and released by appropriate certifying staff.

For an overview of how Part-ML fits into continuing airworthiness, see EASA’s continuing airworthiness domain.

3. Common Owner Mistakes

• Signing tasks not in the AMP. Performing a task (e.g. oil change, filter replacement) and signing it as pilot-owner when that task is not listed in the AMP as a pilot-owner task. At audit, such entries are not valid and can be raised as a finding.

• Treating pilot-owner sign-off as a CRS. Recording a pilot-owner completion as if it were a release to service. Only certifying staff can issue a CRS; mixing the two undermines traceability and can lead to non-compliance with ML.A.801.

• No or incomplete AMP definition. The AMP does not contain a clear list (e.g. Appendix D) of tasks allowed for pilot-owner. Without it, there is no regulatory basis for any pilot-owner signature and findings are likely.

• Missing or inconsistent tech log entries. Doing the work but not recording date, task description, and pilot-owner signature in the tech log or other approved record. Incomplete records make it impossible to demonstrate compliance and can trigger findings during ramp or desk audits.

4. Risk Analysis

What can go wrong?

• Entries made outside the scope of ML.A.803 are not valid. The task may be considered not properly released, affecting continuing airworthiness and potentially the validity of the next CRS if the maintenance programme is not fulfilled as declared.
• If an incident or audit reveals that pilot-owner tasks were performed or signed outside the AMP, the owner is responsible. The competent authority may treat this as a breach of Part-ML and of the declared AMP.

Who is liable?

• The owner is responsible for ensuring that only tasks defined in the AMP are performed and signed as pilot-owner (ML.A.201, ML.A.302, ML.A.803). A Part-66 engineer does not “validate” an out-of-scope pilot-owner sign-off; they are responsible only for work they release via CRS.

How do findings arise?

• During audits (CAMO/NAA or similar), reviewers check that every pilot-owner entry corresponds to a task in the AMP and that records are complete.
• Ramp checks can include scrutiny of tech log and AMP; discrepancies between what is signed and what the AMP allows lead to findings and potential enforcement.

5. Documentation Checklist

• AMP contains a pilot-owner task list – e.g. Appendix D or equivalent listing every task you may perform and sign as pilot-owner.
• Task is on that list – Before performing any work, confirm the task is explicitly allowed for pilot-owner in your current AMP.
• Tech log (or approved equivalent) entry – Date, aircraft identification, task description (or reference to AMP task), your signature as pilot-owner; no use of CRS wording unless a separate CRS is issued by certifying staff.
• No CRS claimed – Pilot-owner entries must not state or imply a Certificate of Release to Service.
• Records retained – All pilot-owner entries and supporting evidence (e.g. receipts, logs) kept in accordance with Part-ML retention requirements.
• AMP revision control – If the AMP is revised and the pilot-owner list changes, you only sign tasks that are in the current effective AMP version.

6. FAQ

Can I sign off an annual inspection myself?

No. An annual (or equivalent periodic) inspection is not a task that Part-ML allocates to pilot-owner maintenance. It must be performed and released by appropriate certifying staff (CRS under ML.A.801). Your role as owner is to ensure it is carried out and documented; you cannot sign it as pilot-owner.

What tasks can I perform as pilot-owner?

Only tasks that your declared or approved AMP explicitly lists as pilot-owner tasks (e.g. in an appendix). Typical examples, when so listed, include simple servicing (oil, fluids, tyre pressures), replacement of specified consumables, and certain minor inspections. The exact list is in your AMP, not in a generic list.

Does pilot-owner maintenance replace a CRS?

No. Pilot-owner sign-off under ML.A.803 is a record of task completion for AMP compliance. A CRS (ML.A.801) is a separate legal act issued by certifying staff. For tasks that require a CRS, the pilot-owner cannot substitute that release.

Who checks that I stayed within scope?

The competent authority (e.g. NAA) and any contracted CAMO/CAO may check during audits or oversight. They will compare your tech log entries to the AMP’s pilot-owner task list. Staying within scope is your responsibility as owner.

Can I sign off an AD as pilot-owner?

Only if the AD and your AMP both allow it. Many ADs require compliance by certifying staff and a CRS. If the AD and your AMP explicitly permit pilot-owner performance and recording, then you may sign within that scope; otherwise the work must be released by certifying staff. See AD vs SB for the distinction between AD and SB and when compliance is mandatory.

Summary: Pilot-owner maintenance under ML.A.803 is limited to tasks listed in your AMP. Only perform and sign tasks that are explicitly in the programme; record every task in the tech log with date, task, and signature. Do not treat pilot-owner sign-off as a CRS, and ensure your AMP defines the pilot-owner scope clearly to avoid findings.