ICAO English is the language proficiency of pilots. This language proficiency examination is mandatory for all pilots in order to communicate with and contact international aviation and air traffic controllers and must be done in accordance with the ICAO regulations.
Currently, each pilot flying internationally must have a minimum level 4 of ICAO English language proficiency check on their license. The recurrence of undertaking the ICAO English proficiency examination is determined by the level achieved:
Level 4 – every 3 years
Level 5 – every 6 years
Level 6 – unlimited validity