Ignition A is powered by?

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Multiple Choice

Ignition A is powered by?

Explanation:
Ignition A is tied to a power source that stays alive for critical functions, including the engine start sequence. The AC essential bus is designed to feed essential equipment with reliable AC power, even when some other electrical systems are degraded. During engine start, generators may not be online yet, so having ignition powered from the AC essential bus ensures the spark events can occur reliably as soon as power is available from the APU, external power, or remaining generators. This makes the AC essential bus the appropriate and best source for ignition A.

Ignition A is tied to a power source that stays alive for critical functions, including the engine start sequence. The AC essential bus is designed to feed essential equipment with reliable AC power, even when some other electrical systems are degraded. During engine start, generators may not be online yet, so having ignition powered from the AC essential bus ensures the spark events can occur reliably as soon as power is available from the APU, external power, or remaining generators. This makes the AC essential bus the appropriate and best source for ignition A.

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