What is the primary function of the magneto in an aircraft engine?

The primary function of the magneto in an aircraft engine is to supply electrical current for ignition. Magnetos are self-contained ignition systems that generate high voltage for spark plugs without needing an external power source. They convert the mechanical energy produced by the engine into electrical energy, allowing for the ignition of the fuel-air mixture in the cylinders.

This process is crucial for engine operation, as it ensures that the combustion process occurs at the correct time, enabling the engine to run smoothly and efficiently. The reliability of magnetos is particularly important because they provide redundancy; typically, airplanes are equipped with two magnetos for safety, ensuring that if one fails, the other can continue to provide the necessary spark for ignition.