What is the role of a magneto in an aircraft engine?

The magneto plays a crucial role in an aircraft engine by generating the electrical spark necessary for ignition. It operates independently of the aircraft's electrical system, which is particularly important in aviation where reliability is paramount. The magneto uses permanent magnets to produce alternating current, which is then converted to high-voltage direct current that ignites the fuel-air mixture in the engine’s cylinders. This process happens in a timely manner, ensuring that the engine maintains smooth and efficient operation.

The design of the magneto allows it to function even if the aircraft’s battery or electrical system fails, thus enhancing safety. As a result, the correct answer emphasizes the magneto's essential function in providing the ignition spark, while the other options discuss systems that are not related to the ignition process.