ICAO English Level 5: Mastery in Aviation Communication

ICAO 5, also called ICAO English Level 5, is the Extended level on the ICAO language proficiency scale. This guide explains what the rating means, how re-evaluation works and how to prepare for an aviation English assessment.

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What does ICAO 5 mean?

ICAO English Level 5 is a language proficiency rating called Extended. It is above Level 4, Operational, and below Level 6, Expert, on the ICAO Rating Scale. Level 4 is the minimum for radiotelephony on international operations, so Level 5 is a higher rating rather than a universal minimum. For more on the minimum level, see our ICAO Level 4 English test guide.

The ICAO language proficiency requirements apply to aeroplane, helicopter, airship and powered-lift pilots, air traffic controllers and aeronautical station operators who use radiotelephony. They do not apply to maintenance technicians or cabin crew.

The assessment concerns more than memorising aviation terminology. It assesses plain language in an operational context: for example, being able to explain a situation, understand a response and work towards a shared understanding. Standard phraseology remains important in operations, but knowledge of phraseology alone is not the whole language assessment.

ICAO does not run or sell the test. Each State’s licensing authority approves the tests used for its licences, and the resulting level is endorsed on the licence.

How long is ICAO Level 5 valid?

ICAO recommends that Level 5 holders are re-evaluated at intervals not exceeding 6 years. That recommendation is a useful starting point, but you should check the requirements of the licensing authority responsible for your licence. Authorities can set their own intervals.

For example, EASA Part-FCL, FCL.055, specifies re-evaluation every 6 years for Level 5. The rule that matters to you is the one applicable to your licence and circumstances; do not assume that an interval quoted for another authority applies automatically.

Check your endorsement and contact your licensing authority if you are unsure when you need to be assessed again. Give yourself time to find an approved test and prepare for it. If you are considering a change of licensing authority, check its requirements rather than relying on an assumption about how your existing endorsement will be treated.

For comparison, Level 6 holders need no further evaluation under ICAO. Again, consult your own authority about the requirements applicable to your licence.

How is ICAO English Level 5 assessed?

The ICAO Rating Scale covers six skills: Pronunciation, Structure, Vocabulary, Fluency, Comprehension and Interactions. Your overall level is the lowest of your ratings across those skills. The scores are not averaged.

For example, if a candidate receives Level 5 in five skills and Level 4 in the remaining skill, the overall rating is Level 4. To receive an overall Level 5, the lowest skill rating must be Level 5.

That makes a balanced preparation plan useful. The following are practical ways to work on each area; they are study suggestions, not the detailed official Level 5 descriptors:

• Pronunciation: Practise making your words easy to understand, including their stress and rhythm.
• Structure: Build clear sentences to describe a situation, explain what has happened and state what you intend to do.
• Vocabulary: Practise describing changes, locations and difficulties in more than one way.
• Fluency: Develop the ability to keep an explanation moving while allowing yourself time to organise your thoughts.
• Comprehension: Listen for the main message and relevant details, and identify what remains unclear.
• Interactions: Respond to the other speaker, check understanding and resolve a misunderstanding when necessary.

Speaking and listening are tested; reading and writing are not part of the ICAO rating. If you have feedback from a previous assessment, use it to identify an area that deserves particular attention rather than practising only the skills you already feel comfortable using.

What does effective communication look like in practice?

ICAO’s holistic descriptors for proficient speakers cover communication by voice alone as well as face to face. They include communicating clearly about common, concrete and work-related topics, and using strategies to recognise and resolve misunderstandings. They also cover handling an unexpected turn in a routine work situation with relative ease.

For practice, imagine that a pilot wants to avoid weather ahead. The following exchange illustrates a request and a check for understanding. It is a language exercise, not prescribed phraseology:

Pilot: We can see weather ahead and would like to turn left to avoid it.

Controller: Confirm that you are requesting a deviation to the left.

Pilot: Affirm, we are requesting a deviation to the left.

Notice that the controller checks the request before the pilot confirms it. In your own practice, change the situation and explain it without relying on the same sentences. You could ask a partner to misunderstand a detail deliberately, then practise identifying and correcting it calmly.

For actual operations, use the applicable standard phraseology. Plain English is valuable when you need to explain something that phraseology alone does not convey.

For more examples, see these Level 5 model answers for non-routine situations.

How to prepare for ICAO English Level 5

Start by finding out which test is approved for your licence and asking its provider what format to expect. A test may include an interview about your work and experience, listening to aviation recordings, a picture description, or a role-play or discussion of a non-routine situation. Formats vary by provider.

Then build a practice routine around communication rather than isolated word lists. The following activities can help you identify what you understand and what you can explain spontaneously:

1. Describe your work aloud. Explain familiar duties, equipment or procedures as if you were speaking to someone who needs a clear overview. Add a change to the situation and explain its effect in your own words.
2. Listen actively. Use suitable aviation recordings or practice audio. After listening, say what you understood, which details mattered and what you would ask the speaker to clarify. Listen again and check your understanding.
3. Practise alternatives. If a word does not come to mind, explain the meaning using simpler language. Our aviation English vocabulary guide can help you organise useful language around topics you encounter.
4. Work with a partner. Take turns describing a weather-related change or another mildly non-routine situation. Ask follow-up questions, confirm the other person’s meaning and correct any misunderstanding.
5. Review your own speaking. Record a practice answer and listen for places where a listener might struggle to follow you. Repeat the exercise with a clearer explanation, rather than trying to reproduce a memorised answer.

For a structured resource, the Speak, Fly, Pass ICAO English eBook is designed for non-native pilots and air traffic controllers preparing for the test. It covers Levels 4 to 6 and includes 190 pages and 25 practice audio files.

Common preparation mistakes to avoid

Relying on memorised answers. Rehearsing useful language can help you start, but a conversation may take an unexpected direction. Practise answering a different follow-up question each time so that you can adapt your explanation to what the other person actually says.

Studying vocabulary without using it. Knowing a word on a list is different from using it to explain a situation. Put new words into short spoken descriptions, then try explaining the same idea in simpler terms. Clear meaning is a better practice goal than using complicated language for its own sake.

Focusing only on speaking. Listening and interaction are part of communication too. When practising with someone, pay attention to their question before deciding what to say. If you are unsure, practise asking for repetition or clarification instead of guessing.

Ignoring a weaker skill. Because the lowest skill rating determines the overall level, a balanced plan matters. Use available feedback to decide where to focus, while continuing to maintain the other skills.

Trying to remove your accent. ICAO’s holistic descriptors call for a dialect or accent that is intelligible to the aeronautical community. Aim for understandable pronunciation and give a listener the chance to tell you when something is unclear.

How to choose a test and plan ahead

Begin with your licensing authority. Check which tests it approves for your licence and what re-evaluation interval applies to you. Then contact the provider of an approved test for practical information about its format and what you need to do before the assessment.

Do not assume that every test uses the same sequence of activities. You can prepare broadly by discussing your work, listening carefully and describing unfamiliar situations, while also following the candidate information for your chosen test. Our ICAO English test guide provides an overview of the assessment process.

Before you book, review any previous feedback and choose practice activities that address your needs. If comprehension was difficult, spend time listening and checking what you understood. If you found it hard to explain an unexpected change, practise describing one in your own words and responding to questions about it.

Frequently asked questions

Is ICAO Level 5 required for international operations?

ICAO Level 4, Operational, is the minimum for radiotelephony on international operations. Level 5, Extended, is above that minimum. Check with your licensing authority about the requirements that apply to your licence and work.

Is ICAO English Level 5 valid for 6 years?

ICAO recommends re-evaluation at intervals not exceeding 6 years for Level 5. EASA Part-FCL specifies every 6 years for Level 5. Your licensing authority’s applicable rule determines what you need to do, so check it directly.

Can I achieve Level 5 if I have an accent?

An accent does not have to be removed. ICAO’s holistic descriptors call for a dialect or accent that is intelligible to the aeronautical community. Practise being understood, and remember that your overall rating also depends on the other assessed skills.

Can a higher score in one skill make up for a Level 4 in another?

No. The overall rating is the lowest of the six skill ratings, not an average. If the lowest rating is Level 4, the overall rating is Level 4, even when another skill is rated higher.

Preparing for ICAO Level 5 is an opportunity to strengthen the way you explain, listen and check understanding. Focus on the skills you need to develop, and confirm the test and re-evaluation requirements with your licensing authority.