Main characteristics of avionics systems and systems are given: radio altimeters, aircraft transponders of secondary radar systems, on-board radar stations, on-board ground proximity warning systems, on-board navigation and landing equipment, Doppler speed and drift angle meters, satellite navigation systems, automatic dependent surveillance equipment, aircraft radio communication equipment, on-board collision prevention systems, on-board flight and navigation systems, principles of their functioning, types and location of antennas used, features of flight operation.