---
title: "CAO.A.120 Occurrence reporting — Part-CAO · Avioverse"
description: "The organisation shall establish and maintain an occurrence reporting system, including mandatory and voluntary reporting."
url: "https://avioverse.aero/regulations/easa/continuing-airworthiness/part-cao/section-a-organisation-requirements/cao-a-120"
---

# CAO.A.120 Occurrence reporting

Annex Vd (Part-CAO) · Regulation (EU) No 1321/2014 · EAR revision 2 Sep 2025

Official sources: [EASA Easy Access Rules (opens in a new tab)](https://www.easa.europa.eu/en/document-library/easy-access-rules/easy-access-rules-continuing-airworthiness) · [EUR-Lex 2014/1321 (opens in a new tab)](https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:32014R1321)

IR Implementing rule

## CAO.A.120 Occurrence reporting

(a) The [organisation](https://avioverse.aero/glossary/easa/organisation) shall establish and maintain an occurrence reporting system, including mandatory and voluntary reporting. For organisations that have their [principal place of business](https://avioverse.aero/glossary/easa/principal-place-of-business) in a Member State, a single system may be established to meet the requirements of Regulation (EU) No 376/2014 and its delegated and implementing acts and of Regulation (EU) 2018/1139 and its delegated and implementing acts.

(b) The organisation shall report to its competent authority and to the organisation responsible for the design of the [aircraft](https://avioverse.aero/glossary/easa/aircraft) or [component](https://avioverse.aero/glossary/easa/component) any safety-related event or condition of an aircraft or component identified by the organisation which endangers or, if not corrected or addressed, could endanger an aircraft, its occupants or any other person, and in particular any accident or serious incident.

(c) The organisation shall also report any such event or condition that affects an aircraft or component, as applicable:

(1) to the owner or operator of that aircraft, when such event or condition was identified while managing the [continuing airworthiness](https://avioverse.aero/glossary/easa/continuing-airworthiness) in accordance with point M.A.201 of Annex I (Part-M) or point ML.A.201 of Annex Vb (Part-ML), as applicable;

(2) to the person or organisation that is responsible for the continuing airworthiness of that aircraft in accordance with point M.A.201 of Annex I (Part-M) or point ML.A.201 of Annex Vb (Part-ML), as applicable, when such event or condition was identified while carrying out continuing airworthiness activities requested by that person or organisation;

(3) to the person or organisation that requested the component [maintenance](https://avioverse.aero/glossary/easa/maintenance), if different from point (2), when such event or condition was identified while carrying out component maintenance.

(d) For organisations that do not have their principal place of business in a Member State:

(1) the initial mandatory report shall:

(i) appropriately safeguard the confidentiality of the identity of the reporter and of the persons mentioned in the report;

(ii) be made as soon as practicable, but in any case, within 72 hours after the organisation has become aware of the occurrence unless exceptional circumstances prevent that;

(iii) be made in a form and manner established by the competent authority;

(iv) contain all pertinent information about the condition known to the organisation;

(2) where relevant, a follow-up report that provides details of the actions that the organisation intends to take to prevent similar occurrences in the future shall be made as soon as those actions have been identified; those follow-up reports shall:

(i) be sent to the entities referred to in points (b) and (c) to which the initial report was sent;

(ii) be made in a form and manner established by the competent authority.

IR · CAO.A.120 — Regulation (EU) No 1321/2014 · Continuing Airworthiness Easy Access Rules · EAR revision 2 Sep 2025

[All rules in SECTION A — ORGANISATION REQUIREMENTS](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-cao/section-a-organisation-requirements)

Consolidated from the EASA Easy Access Rules (revision 2 Sep 2025, extracted 2 Nov 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.