What is the correct description of a magneto's role in ignition?

What is the correct description of a magneto's role in ignition?

• A. It provides power to the electrical system
• B. It provides a reliable ignition spark to the spark plugs independent of the aircraft's electrical system
• C. It senses engine temperature
• D. It pumps fuel to the cylinders

Answer: (B)

A magneto is a self-contained ignition source that drives spark plugs without relying on the aircraft’s electrical system. It spins with the engine and uses magnets and a coil to generate a high-voltage spark at the precise moment in the compression stroke. That spark is routed to the appropriate spark plugs, ensuring each cylinder fires reliably whether or not the battery or alternator is delivering power. This independence is why the description that says it provides a reliable ignition spark to the spark plugs independent of the aircraft's electrical system is the best fit. It isn’t responsible for supplying electrical power to other systems, sensing engine temperature, or pumping fuel.

A magneto is a self-contained ignition source that drives spark plugs without relying on the aircraft’s electrical system. It spins with the engine and uses magnets and a coil to generate a high-voltage spark at the precise moment in the compression stroke. That spark is routed to the appropriate spark plugs, ensuring each cylinder fires reliably whether or not the battery or alternator is delivering power. This independence is why the description that says it provides a reliable ignition spark to the spark plugs independent of the aircraft's electrical system is the best fit. It isn’t responsible for supplying electrical power to other systems, sensing engine temperature, or pumping fuel.