For a typical aircraft to lift off from the ground and achieve flight, it must expend a massive amount of energy. While aircraft engines are advanced systems that harness the combustion of fuel to create thrust, the engines are not the only things aircraft have that utilize power. There are also many electronic systems and other devices, ranging from the lights that illuminate the cabin to the instruments that provide pilots with readings on flight conditions. To ensure that everything on and across the aircraft has the power needed to function as intended, most aircraft feature a special component known as an auxiliary power unit (APU). As a common fixture of many modern aircraft, it can be very useful to have a general understanding of their functionality and use.


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