184.—(1) Subject to paragraph (3), the CAA must ensure that it, or an approved person, assesses the English language proficiency of the holder of an air traffic controller’s licence or a student air traffic controller’s licence at regular intervals.
(2) Subject to paragraph (3), the interval at which the language proficiency of the holder of an air traffic controller’s licence or a student air traffic controller’s licence must be assessed must be no longer than—
(a)three years for a licence holder who demonstrates proficiency in English language to level 4 on the language proficiency rating scale; and
(b)six years for a licence holder who demonstrates proficiency in English language to level 5 on the language proficiency rating scale.
(3) Paragraphs (1) and (2) do not apply to a licence holder who has demonstrated proficiency in English language to level 6 on the language proficiency rating scale.