4.4. Language proficiency
4.4.1. An air traffic controller shall demonstrate proficiency to speak and understand English to the extent he/she is able to communicate effectively in voice-only (telephone/radiotelephone) and in face-to-face situations on concrete and work-related topics, including in emergency situations. 4.4.2. Whenever necessary in a defined volume of airspace for Air Traffic Service (ATS) provision purposes, an air traffic controller shall also have proficiency to speak and understand the national language(s) to the extent described above.
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Source: EUR-Lex (Cellar) · retrieved 2026-10-12 · Text as adopted (Official Journal); later amendments are not incorporated in this text.