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316 - FAA PPL(A) USA - Why do most standard certificated aircraft incorporate a dual ignition system with two individual magnetos, separate sets of wires, and spark plugs?

Question 316 - Preflight Preparation - FAA PPL(A) - Private Pilot Airplane

The engine will not run properly with only one magneto
To increase reliability of the ignition system
To ensure engine balance

Training tests and timed exam simulations FAA PPL(A) - Private Pilot Airplane