How to Understand an EASA Conflict Zone Information Bulletin
Last updated: April 2026
EASA publishes Conflict Zone Information Bulletins (CZIBs) when armed conflict or military activity in a region poses a risk to civil aviation. CZIBs are the European equivalent of FAA flight restrictions, though they operate differently. As of 2026, EASA has published CZIBs for over a dozen regions, according to EASA's Safety Publications database. This guide explains how to read them.
Find active CZIBs on the EASA website
Navigate to the EASA Safety Publications Tool at easa.europa.eu and filter by document type "Conflict Zone Information Bulletin." Active CZIBs are listed with their publication date, affected region, reference number, and current status. Each CZIB is a self-contained document that covers a specific geographic area.
Read the FIR/UIR identification
Each CZIB specifies one or more Flight Information Regions (FIRs) or Upper Information Regions (UIRs) by their ICAO code (e.g., OIIX = Tehran FIR, OSTT = Damascus FIR). These codes define the exact airspace boundaries covered by the bulletin. A single country may have multiple FIRs, and a CZIB may cover all or just some of them.
Check the restriction level
CZIBs use graduated language. A "recommendation to avoid" is advisory. A "strong recommendation" signals elevated risk. An "instruction not to operate" is the strongest level, as described in EASA's CZIB framework. Unlike FAA SFARs, which carry regulatory force for US operators, CZIBs are generally advisory for EU operators, though individual EU member states may adopt them as binding restrictions through their national aviation authority.
Note the altitude restrictions
Some CZIBs apply only below certain flight levels. For example, a CZIB might state "below FL250" (approximately 25,000 feet), meaning overflying at higher altitudes may still be permitted under the bulletin's terms. Others apply to all altitudes. Check the exact altitude floor and ceiling specified in the bulletin text to understand the full scope of the restriction.
Check validity and renewal dates
CZIBs have a publication date and are reviewed by EASA on a regular cycle. Some include an explicit validity period. EASA updates or renews CZIBs as the security situation changes. Check whether the CZIB has been amended, renewed with updated dates, or superseded by a newer version with a different reference number.
Understand what it means for your airline
EU-registered airlines are the primary audience for CZIBs. Non-EU airlines follow guidance from their own national aviation authority. When a CZIB covers a FIR along your route, your airline has assessed the risk and decided whether to overfly, reroute, or adjust altitude based on the bulletin and their own safety management system. Different airlines may make different routing decisions for the same CZIB.
This guide is for informational purposes only. CZIB interpretation for operational decisions requires professional aviation expertise. Always consult official sources for authoritative information.