For certain license categories and authorizations, and in accordance with Annex 1 (Personnel Licensing), the International Civil Aviation Organization (ICAO) requires to prove that the mastering of languages used in air traffic are adequately controlled / examined . This is essential for situations that cannot be described by exclusively using standard phraseology.
The ICAO Language Proficiency Test (LP-Test) is used to determine a pilot’s linguistic ability to communicate correctly in the language he uses when flying. The evaluation takes place in so-called "levels" between 1 (worst value) and 6 (best value). The minimum requirement for radio communication in English is Level 4. All ratings below 4 mean that the pilot has failed the test.
