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

The main role of a magneto in an aircraft is to ignite the fuel mixture. Magnetos are self-contained ignition systems that generate high-voltage electricity, which is essential for creating a spark in the engine's cylinders. This spark ignites the fuel-air mixture, allowing the engine to produce power. The operation of the magneto is crucial for the reliable ignition of the engine, particularly in piston-driven aircraft, where consistent and efficient combustion is necessary for optimal performance.

While there are other components in an aircraft that handle fuel measurement, engine noise reduction, and cooling, none of these tasks are within the function of the magneto. Its primary focus remains on ensuring the accurate and timely ignition of the fuel mixture, which is vital for the engine to operate effectively.