An aircraft engine or aero-engine is the powerplant of a vehicle that works by igniting fuel with air in a combustion chamber to produce immense amounts of energy for powering systems and achieving flight. During operation, excess heat from an overheated engine can set fire to lubricants and cause major damage, such as warping engine surfaces, creating cracks, vaporizing oil, etc. Although most excess heat generated is removed through the exhaust system, that is not enough to ensure safety. To prevent temperature fluctuations, at least 33% of heat needs to be removed by the cooling system. Hence, proper cooling arrangements are necessary for the reliability and longevity of engine parts. Air and liquid cooling systems are assemblies that are often present on aircraft for the means of managing temperatures. Though liquid-cooled engines were regularly used in the early days of aviation, air-cooled engines became dominant in aircraft because of their lower weight and efficient designs. Nevertheless, some aircraft still use a liquid cooling system to dissipate heat from their engine or rely on a combination of both. Therefore, it largely depends on the type of engine one is using. Furthermore, various additional solutions can be used for cooling, including devices such as cowl flaps and radiators. In this blog, we will briefly discuss the types and functions of aircraft engine cooling systems.