New ICAO accident investigation rules: what changes for airlines in 2026

Key data

European airlines and air operators must pay attention to what is decided at the 237th session of the ICAO Council: the amendment to Annex 13 of the Chicago Convention may modify the international standards that govern how civil aviation accidents and incidents are investigated. The Council Decision (EU) 2026/714, adopted on 17 March 2026, establishes the official position that the European Union will defend in that session.

Although the direct impact falls on national accident investigation authorities, air operators are those who will have to translate those changes into concrete adjustments to their internal procedures. Ignoring this regulatory evolution could result in breaches of international regulatory compliance with operational and reputational consequences.

What does this regulation establish?

The Council Decision does not directly modify the internal legislation of air operators, but rather sets the position that the EU will adopt in international negotiations. The subject of that negotiation is the amendment to Annex 13 of the Convention on International Civil Aviation, known as the Chicago Convention, which regulates the procedures for investigating civil aviation accidents and incidents worldwide.

The changes that the amendment could introduce, according to available data, are concentrated in three areas:

• Data collection: possible modifications to the standards on what information should be collected and how during an accident or incident investigation.
• Protection of safety information: changes to the rules that protect certain sensitive data generated during investigations, with the aim of fostering a safety culture without fear of retaliation.
• Coordination between investigating States: new procedures or standards for collaboration between countries involved when an accident involves aircraft or citizens of different nationalities.

Harmonization with the standards approved by ICAO is mandatory for EU Member States, which means that once the amendment is adopted, national civil aviation authorities will have to incorporate it into their internal regulations, transferring obligations to operators.

Economic and operational impact

The direct economic impact of this Decision is indirect at this stage: the EU is only setting its negotiating position. The real impact on companies will materialize when the amendment is adopted at the 237th session of the ICAO Council and subsequently transposed by Member States.

Nevertheless, operators should anticipate the following potential operational effects:

• Review and update of internal procedure manuals for incident and accident management.
• Possible investments in systems for data collection and protection related to operational safety.
• Need for training of personnel involved in incident management to adapt to the new standards for coordination with investigating authorities.
• Greater requirements in the documentation and traceability of incident notification processes.

As this is mandatory international harmonization regulation, non-compliance is not a viable option for operators that operate in European airspace or under the flag of an EU Member State.

Who does it affect?

• European airlines: both passenger and cargo carriers, which will have to adapt their internal protocols for accident and incident management.
• Air operators: any company that operates aircraft under the regulation of an EU Member State, including general aviation and charter operators.
• Civil aviation authorities: national bodies such as AESA in Spain, which will have to incorporate the new ICAO standards into internal regulations.
• Accident investigation bodies: such as CIAIAC in Spain, which are the primary direct recipients of changes to Annex 13.
• Operational safety departments (Safety): those responsible for SMS (Safety Management System) in airlines and operators who manage incident reporting and analysis.
• Legal and regulatory compliance advisors in the aeronautical sector who must anticipate changes for their clients.

Practical example

A medium-sized Spanish airline operating European and international routes currently has an internal incident management protocol aligned with the current Annex 13 of the Chicago Convention. Its procedures include notification to CIAIAC, preservation of flight data and coordination with authorities in the State where the incident occurs.

If the amendment to Annex 13 introduces new requirements on protection of safety information, this airline will have to review its international confidentiality agreements with crews and maintenance personnel, update its operations manual in the safety management section and possibly adapt its data collection systems to comply with the new traceability standards. The Safety department would be responsible for leading that adaptation, in coordination with the legal and regulatory compliance area.

The time to start that review is not when the amendment enters into force, but now, to anticipate changes and not act under time pressure.

What should companies do now?

1. Identify potential impact: the Safety department or regulatory compliance officer should analyze the three areas of expected change (data collection, protection of safety information and coordination between States) and assess the extent to which they affect current procedures.
2. Monitor the outcome of the 237th session of the ICAO Council: the amendment to Annex 13 must be formally adopted in that session to take effect. Following the outcome is the prerequisite for any adaptation.
3. Review internal incident management protocols: regardless of the final outcome, it is a good time to audit whether current procedures are aligned with the current Annex 13, as a basis for any future updates.
4. Coordinate with the national civil aviation authority: in Spain, AESA will publish transposition instructions once changes become mandatory. Maintaining that channel active allows anticipating adaptation timelines.
5. Update operational documentation: when the amendment is adopted and transposed, update operations manuals, SMS procedures and confidentiality agreements with personnel involved in incident management.