ICAO English Levels and Certificate Validity Explained
To support safe and effective communication worldwide, ICAO and EASA have established standardized English proficiency levels for aviation professionals. These standards enable pilots, air traffic controllers, and ground staff to communicate clearly, confidently, and efficiently across all operational environments.
- Levels / Validity
ICAO ENGLISH LEVELS EXPLAINED
LEVEL 4 VALIDITY: 4 YEARS
ICAO Level 4, also known as Operational, is the minimum international standard required for clear and reliable English communication in aviation. At this level, you are able to understand and deliver essential instructions accurately, ensuring that all critical information is exchanged without confusion. While complex or unexpected situations may still present challenges, achieving Level 4 demonstrates a strong language foundation that supports safe and efficient day to day operations in a global aviation environment.
LEVEL 5 VALIDITY: 6 YEARS
ICAO Level 5, known as Extended, represents a higher level of fluency, clarity, and comprehension beyond the operational standard. At this level, professionals can manage a wider range of situations, including those that are more complex or unexpected. While communication may not yet be fully expert level, achieving Level 5 demonstrates confidence and adaptability, contributing to improved safety and efficiency across diverse global aviation environments.
LEVEL 6 VALIDITY: UNLIMITED
ICAO Level 6, referred to as Expert, represents near native fluency and a high level of ease in communication across almost all situations. Professionals at this level can understand and convey complex information smoothly, adapting quickly to changing circumstances without hesitation. Achieving Level 6 significantly reduces the risk of misunderstandings and reflects exceptional confidence, clarity, and overall operational excellence in international aviation environments.
ICAO vs EASA English Understanding the differences
Both ICAO and EASA assess English language proficiency to ensure safe and clear communication in aviation. While they follow a similar framework, their origins and validity periods differ slightly. ICAO introduced global standards in 2008 under Doc 9835, while EASA later adopted these regulations for European Union member states.
The key difference is the validity of Level 4 certification. Under ICAO, Level 4 is valid for three years, whereas EASA extends the validity to four years. For Levels 5 and 6, the validity is the same under both systems, with Level 6 offering lifetime recognition.
Although professionals often refer to both systems as ICAO English, understanding these differences is important for compliance and career progression. At Level6 Aviation, our assessments are recognized across EASA member states, helping you meet both international and regional requirements with confidence.
