What is ICAO Level 4 English?

The Level 4 (operational) proficiency is considered as a minimum 'stepping stone' to higher levels. The main benefit of high international standards of aviation English is that communications between aircraft crew and controllers are fully understood, particularly when non-standard words and phrases are used.



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ICAO concentrates on the implementation, understanding, and the standardization of all the elements, towards the achievement of the English Language Proficiency Level 4 as a minimum operational level, equally valid within all Member States.

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Extended Level 5 speakers demonstrate a marked accent, or localized regional variety of English, but one which rarely interferes with how easily understood their speech is. They are always clear and understandable, although, only occasionally, a proficient listener may have to pay close attention.

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According to the International Civil Aviation Organisation (ICAO), air traffic controllers and pilots must achieve at least ICAO Operational Level 4 language proficiency to earn a licence. ICAO Expert Level 6 is the highest language proficiency level, and the certificate can remain valid for a lifetime.

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ICAO concentrates on the implementation, understanding, and the standardization of all the elements, towards the achievement of the English Language Proficiency Level 4 as a minimum operational level, equally valid within all Member States.

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ICAO Level 6 is so-called Expert ICAO level and is considered to be the highest level you can get when it comes to the ICAO language proficiency exam. People use to say, that you are a Native English speaker.

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The English language proficiency level 6 - the 'expert' level, as it was named by ICAO - is often referred to as the 'native speaker' level. But this is not 100% true. It is possible (for non-native speakers) to reach level 6. But please do not confuse flight experience with English language skills.

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As noted above, ICAO requires that language skills of pilots and controllers rated at Level 4 are reassessed every three years, Level 5 pilots and controllers - every six years, while at Level 6, no further assessment of English language skills is deemed necessary.

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The extended level (ICAO Level 5) fills the gap between the experts (level 6) and the basic operational qualities of level 4. If you pursue a career in aviation, e.g. as an airline pilot, level 5 could be one way for you to give proof of your English language skills, even though you're not a native speaker.

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ICAO Level B requires a 4.5m² fire to be extinguished at an application rate of 2.5L/min/m². ICAO Level C requires a 7.32m² fire to be extinguished at an application rate of 1.75L/min/m². All levels require a heptane fire with a 60 second pre-burn and using potable (fresh) water.

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The Standards, Recommended Practices and explanatory notes contained in Annex 4 define the obligations of States to make available certain ICAO aeronautical chart types, and specify chart coverage, format, identification and content, including standardized symbols and colour guides.

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