GTS FKA 1

Electrical Systems

• The current limiter in an aircraft DC system limits the current to prevent electrical overload.
• The distribution bus in an aircraft electrical system distributes power to various components.
• The essential bus powers vital or emergency loads.

AC Systems

• An advantage of alternating current (AC) over direct current (DC) is that AC can be transformed to higher or lower voltages.
• The inverter in an aircraft AC system converts DC power to AC power.

Instrument Systems

• Altimeters, vertical speed indicators, airspeed indicators, and artificial horizons belong to the flight instrument category.
• Voltmeters, ammeters, and frequency meters belong to the electrical instrument category.
• Quantitative circular scale display instruments indicate maximum and/or minimum operating limits by displaying a marked range on the dial.

Pressure Measurements

• Absolute pressure is measured with reference to a perfect vacuum.
• Fluid pressure is defined as the force exerted per unit area.
• Static pressure is pressure measured in a static or still environment.

Pitot/Static Systems

• A leakage check is required when any item of the pitot/static system is removed or replaced.

Temperature Measurements

• The air temperature that increases due to the ram compression of the boundary layer is called ram air temperature.
• The temperature measured after the final turbine stage is called turbine outlet temperature.
• Thermocouple temperature measurement systems direct hot exhaust gases over the thermocouple.

Fuel Systems

• In a mass indication system, fuel quantity is measured by weighing the fuel.
• The purpose of an engine fuel system pressurising and dump valve is to pressurise the fuel system and dump excess fuel.
• The fuel flow transmitter is located in the fuel system to measure fuel flow.
• A fuel control unit senses inlet air pressure to regulate fuel flow.
• A supervisory electronic engine fuel control system is an electronic device that monitors and controls fuel flow.
• During engine start-up with a pressure control fuel control unit, the fuel flow is controlled by inlet air pressure.
• The high-pressure shut-off cock is located in the fuel system to shut off fuel supply.
• A fuel control unit has a fuel density adjustment to compensate for changes in fuel density.
• A hydro-pneumatic fuel control unit uses hydraulic pressure to regulate fuel flow.
• The fuel pressure differential switch is located in the fuel system to monitor fuel pressure differences.

Oil Systems

• The difference between synthetic and mineral-based engine oils is their chemical composition and performance.
• The SAE grading of oil gives a rating of the oil's viscosity.
• Synthetic engine lubricating oil vapors are less hazardous than mineral-based oils.
• When replenishing a synthetic-based oil system, the oil must be of the same type and grade.
• Synthetic engine oils are disposed of by an authorised contractor in accordance with environmental regulations.
• The characteristic of oil that ensures it remains bound together under compression loads is its cohesion.
• The main function of an electrically actuated oil tank shut-off valve is to shut off oil supply in emergency situations.
• A significant feature of a total loss oil lubricating system is that it does not recirculate the oil.
• The main function of an engine lubrication system oil temperature transmitter is to monitor oil temperature.
• In a cold tank type dry sump lube system, the oil is cooled by circulating it through a cooler.