Membrane-aneroid measuring devices. Kinematic scheme. Operating principle. Gyroscope. Main characteristics. Gyroscopic moment. Horizontal situation indicator. Kinematic scheme. Magnetic and gyroscopic rate measuring device. Systems of automatic guidance. Inertial navigation system. AC and DC power systems. Adjustment hardware. Protection blocks. Antennas, radio transmitters and receivers. Aircraft communications systems. Aircraft navigation systems. Aircraft radiolocation equipment.