Aircraft pressurization systems, cabin pressurization diagrams, emergency orders. Ice protection systems, areas susceptible to icing, types of the ice, detection devices and de-icing methods. Aircraft fuel systems, refuelling, detection of fuel quantity. Aircraft electric power distribution, electric circuits, types, function, fuses. Electric current sources, batteries, types, operation, hazards. DC generators, function, generator control and protection, starter-generator. AC generators, requirements, function, construction, constant speed drive systems. Transformers, rectifications, transformer rectifier units, function, types. DC motors, AC motors, power and revolution control. Electrical distribution systems, bus bars, signal screens. Semiconductor aircraft technology, logic circuits, use for switch over circuits and aircraft system diagnostics. Fire-fighting systems, active and passive fire protections, fire and smoke detectors. Aircraft oxygen equipment, oxygen generators, aircraft emergency equipment, emergency exits, escape sliders.