ICAO Level 4 English Test Guide & Tips

ICAO Level 4 is the Operational level of language proficiency and the minimum for radiotelephony on international operations. If you are preparing for an ICAO English test, the goal is to communicate clearly about your work, including when a routine situation takes an unexpected turn.

Before you plan your preparation, take a free ICAO English practice test to see which skills need the most work.

What ICAO Level 4 means and who needs it

ICAO calls Level 4 Operational. It is part of a scale ranging from Level 1, Pre-elementary, to Level 6, Expert. Level 4 is the minimum for radiotelephony on international operations. Reaching it means demonstrating the language ability required at that level across all the assessed skills.

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 cabin crew or maintenance technicians. If you are unsure how the requirements relate to your licence or role, check with your licensing authority.

The purpose is practical communication. A proficient speaker needs to exchange information clearly in voice-only and face-to-face situations, handle an unexpected complication and recognise and resolve misunderstandings. An accent is not a problem in itself: the relevant aim is speech that is intelligible to the aeronautical community.

The six skills in the ICAO English rating

Each skill contributes to your overall result. The descriptions below are study guidance to help you practise; they are not a substitute for the official rating scale or a prediction of your score.

• Pronunciation: Work on being understood. Practise word stress, rhythm and sounds that a listener finds difficult, while keeping your natural accent.
• Structure: Practise building clear sentences to explain what is happening, what has happened and what you need. Make the relationship between ideas easy to follow.
• Vocabulary: Develop enough language to discuss familiar work topics and describe a problem in another way if the precise word does not come to mind.
• Fluency: Practise speaking in connected thoughts. A useful exercise is to move from a prepared description to an unscripted follow-up question.
• Comprehension: Listen for the main message and the details you need to respond. Practise asking for clarification when something is unclear.
• Interactions: Take part in an exchange rather than delivering a memorised speech. Respond to the other speaker, check understanding and clarify your meaning when needed.

Your overall level is the lowest of the six ratings. For example, if you receive Level 5 in five skills and Level 3 in one, your overall result is Level 3. To receive an overall Level 4, you need at least Level 4 in every skill. This makes it worthwhile to identify and practise your weakest area.

Numbers and readbacks are where many candidates lose points in pronunciation and comprehension. Practise them with our ATC readback and ICAO numbers trainer.

What happens in an ICAO Level 4 English test?

There is no single test format run by ICAO. Each State's licensing authority approves the tests used for its licences, and the language level is endorsed on the licence. Ask your authority or an approved provider for the format and arrangements that apply to you.

A test may include an interview about your work and experience, listening to radiotelephony or aviation recordings, describing a picture, and a role-play or discussion of a non-routine situation. These are examples of possible tasks, not a fixed checklist for every provider.

The assessment covers speaking and listening. Reading and writing are not part of the ICAO rating. Plain language in an operational context matters: knowing standard phraseology alone does not cover the language ability being assessed. Our ICAO English test guide offers a broader introduction to the assessment.

Practice examples for speaking and listening

Use these examples to practise explaining a situation and responding to another person. They are learning prompts, not official test questions, and a model answer cannot establish your ICAO level.

Describe a picture

Practice question: “What can you see in this picture of an aircraft and an airport on a cloudy day?”

Possible answer: “I can see an aircraft on the ground near a terminal. The sky is cloudy, but I cannot tell whether it is raining. There are vehicles nearby, although I cannot see exactly what they are doing.”

This response describes what is visible and makes uncertainty clear instead of inventing details. As a follow-up, ask a partner to question you about the weather or activity in the picture so that you can practise responding without a script.

Clarify a weather request

In this illustrative exchange, the pilot explains a request and the controller checks its meaning:

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

Controller: Please confirm that you are requesting a left turn to avoid the weather.

Pilot: Affirm, requesting a left turn to avoid the weather.

Practise the exchange in both roles, then change the situation or ask for clarification in different words. This is plain-language practice, not a replacement for approved operational phraseology and procedures. For more prompts, see our guide to ICAO English test questions.

How to prepare for the ICAO Level 4 test

Build a routine around your current needs and the format approved for your licence. If you can get feedback from a qualified aviation English teacher, use it to identify which skills need the most attention. The following approach works as a starting point:

1. Start with an honest speaking and listening review. Record yourself describing a familiar work situation, then answer an unscripted follow-up. Note where your meaning is unclear, where you hesitate or where you struggle to understand a question.
2. Practise listening actively. Use aviation recordings and listen for the situation, the key information and any request. Summarise what you heard aloud; if a detail is unclear, practise asking the speaker to repeat or clarify it.
3. Build useful vocabulary in context. Choose familiar topics such as weather, airport activity and aircraft systems. Explain each idea in a sentence, then try describing it again using different words. Our aviation English vocabulary guide can help you organise your study.
4. Practise a change in circumstances. With a partner, discuss a routine situation and introduce a simple complication, such as a change in weather. Explain the change, ask a question and check that the other person has understood.
5. Review the full exchange. Do not focus only on sounding fluent. Consider whether you understood the question, answered it, explained your meaning and dealt with any misunderstanding.

Keep your answers relevant and develop them enough to communicate your point. Memorised scripts can help you start practising, but vary the questions so you also learn to respond spontaneously.

Results, re-evaluation and maintaining your English

If one skill is assessed below Level 4, the lowest-score rule means the overall result will also be below Level 4. Use the feedback available to target that skill, while continuing to practise the others. Your licensing authority or approved provider can explain the applicable arrangements for another assessment.

ICAO recommends re-evaluation at intervals not exceeding 3 years for Level 4 and 6 years for Level 5. Level 6 holders need no further evaluation under ICAO. Some authorities set their own intervals: under EASA Part-FCL, Level 4 is re-evaluated every 4 years and Level 5 every 6 years. Check your own licensing authority's requirements rather than assuming that one interval applies to everyone.

Between assessments, continue listening and speaking about situations relevant to your work. Regular practice gives you opportunities to notice misunderstandings and keep your communication skills active.

Choosing preparation materials

Look for material that lets you listen as well as speak, covers familiar aviation contexts and gives you opportunities to respond to unexpected questions. A PDF or list of vocabulary can support study, but use it alongside spoken practice and listening.

The Speak, Fly, Pass ICAO English eBook is a digital resource for non-native pilots and air traffic controllers preparing for the ICAO English Language Proficiency test. It contains 190 pages and 25 practice audio files, and covers Levels 4 to 6.

Frequently asked questions

Is ICAO Level 4 the same as Operational level?

Yes. Operational is the name of Level 4 on the ICAO Rating Scale. It is the minimum level for radiotelephony on international operations.

Do I need perfect English to reach ICAO Level 4?

Focus on clear, intelligible communication rather than trying to remove your accent or memorise flawless answers. You must meet at least Level 4 in each rated skill to receive Level 4 overall; only an assessment can determine your result.

Does ICAO provide the Level 4 English test?

No. ICAO does not run or sell the test. Your State's licensing authority approves the tests used for its licences, so check its requirements before booking.

How long is ICAO Level 4 valid?

That depends on the rules of your licensing authority. ICAO recommends re-evaluation at intervals not exceeding 3 years for Level 4; EASA Part-FCL specifies 4 years. Confirm the interval that applies to your licence.

Are reading and writing assessed for the ICAO language rating?

No. The ICAO rating assesses speaking and listening. An individual test may include different tasks, so check its format with your approved provider.

Prepare for Level 4 by listening carefully, explaining your meaning and practising real exchanges. Clear communication grows with purposeful practice and useful feedback.

Practise next: try all free ICAO English exercises with audio.