Which statement describes why magnetos are preferred in aircraft engines?

Which statement describes why magnetos are preferred in aircraft engines?

• A. They rely on the aircraft battery to generate spark.
• B. They generate a spark independently of the aircraft power system.
• C. They require regular battery replacement.
• D. They produce inconsistent sparks in cold weather.

Answer: (B)

Magnetos are preferred because they provide a self-contained source of ignition energy that does not depend on the aircraft’s electrical power system. They are driven by the engine and generate a high-voltage spark at the spark plugs as the engine turns, even if the battery or alternator fails. This independence from the aircraft’s power system makes ignition more reliable and adds a critical layer of safety. The other statements imply reliance on the aircraft’s battery, require battery changes, or suggest inconsistent sparks with temperature changes, none of which describe why magnetos are favored.

Magnetos are preferred because they provide a self-contained source of ignition energy that does not depend on the aircraft’s electrical power system. They are driven by the engine and generate a high-voltage spark at the spark plugs as the engine turns, even if the battery or alternator fails. This independence from the aircraft’s power system makes ignition more reliable and adds a critical layer of safety. The other statements imply reliance on the aircraft’s battery, require battery changes, or suggest inconsistent sparks with temperature changes, none of which describe why magnetos are favored.