Restrictions on use of aircraft station
34.  No station fitted in an aircraft shall be operated or used while such aircraft is at rest on land or on water in Singapore except —
(a)in exceptional cases or in time of emergency or distress;
(b)if communication by means of a telecommunication line system is not available, for communication in exceptional circumstances on matters relating to air navigation and services with the nearest aeronautical station, or, if communication with such station is impracticable, with any other station; or
(c)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 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.