What is the benefit of a dual ignition system in reciprocating engines?

A dual ignition system in reciprocating engines is primarily designed to enhance reliability and redundancy. This system employs two separate ignition circuits and spark plugs for each cylinder, which means that if one system fails, the other can continue to operate without interruption. This is crucial for ensuring engine performance, especially in critical situations such as flight.

On the other hand, options like reduced fuel consumption, lower maintenance costs, and improved engine weight do not accurately capture the core advantage of having dual ignition systems. While there may be slight improvements in specific operational efficiencies, the fundamental purpose of having two sets of spark plugs and ignition systems is to ensure that the engine can still function safely and effectively in the event of a failure. This redundancy is vital in aviation where reliability is paramount, making option B the most appropriate choice.