Does ICAO require an aircraft radio licence?
The Convention on International Civil Aviation requires (Article 30) that the transmitting equipment be installed and operated in an aircraft in accordance with a radio licence and that (Article 29) the radio licence be carried on board the aircraft. The ICAO documents do not provide a detailed listing of equipment to be mentioned on a radio licence. However, all transmitting radio equipment (VHF, HF, ELT, radar, etc.) installed on an aircraft should be covered in the radio licence.
