Article 24 Maintenance of privileges of other ratings in licences

A person shall not be entitled to perform the functions to which an instrument rating (aeroplanes), an instrument rating (helicopters), a flying instructor’s rating, an assistant flying instructor’s rating, or an instrument meteorological conditions rating (aeroplanes) relates unless his licence bears a valid certificate of test, which certificate shall be appropriate to the functions to which the rating relates in accordance with Part C of Schedule 8 to this Order and shall otherwise comply with that Part.