Electronic and Postal Communications (Radio communications and Frequency Spectrum) G.N. No. 424 (contd) Restrictions on use of aircraft station Amateur radio licence and station licence Conditions for amateur station licence 16. Any station fitted in an aircraft shall not be operated or used while such aircraft is at rest on the land or on waters of Tanzania except(a) in time of emergency or distress; (b) where communication by means of telecommunication line system is not available for communication in exceptional circumstances on matters relating to air navigation and services with the nearest aeronautical station; (c) where communication with such station is impracticable, with any other station; or (d) for the purpose of carrying out experimental tests, with the written consent of and subject to such conditions as may be determined by the Authority; or (e) for the purpose of carrying out functional tests to determine the serviceability of the station: Provided that such tests shall not be carried out on international distress frequencies. 17.-(1) The Authority may subject to sub-regulations (2), grant licence for amateur radio service to such qualified or approved natural persons interested in operation of radio communication equipment. (2) The licence granted under these Regulation shall be classified as follows: (a) General Class - for applicants aged twenty one years and above who are qualified to operate amateur radio equipment; and (b) Restricted Class - for applicants aged between eighteen and twenty one years who shall be supervised by qualified person. 18. An amateur station licensee shall observe and comply with the following conditions- 134