(1)No person shall perform duty as an air traffic controller in an air traffic services unit unless his licence contains the ratings for the said purpose:Provided that the holder of a Student Air Traffic Controller's Licence or' an Air Traffic Controller's Licence may perform duty in a particular air traffic services unit without the relevant rating. for the purpose of qualifying for endorsement of such rating in his licence, under the direct supervision of a person holding the rating for that particular air traffic services unit ,and authorised by the Director General to act as an instructor.
