ENG Ignition power sources?

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Multiple Choice

ENG Ignition power sources?

Explanation:
Engine ignition is designed to stay available even if one power source fails, so there are two independent paths. One path uses System A’s AC power to feed the ignition exciters directly. The other path uses System B to provide power from the battery bus through a static inverter, which converts DC to the AC needed by the ignition system. This setup gives redundancy: if AC power is lost, the ignition can still operate via the inverter-backed path, and vice versa. Relying on a single source like battery power alone, or on APU or a single generator without this paired arrangement, wouldn’t guarantee ignition in all failure scenarios.

Engine ignition is designed to stay available even if one power source fails, so there are two independent paths. One path uses System A’s AC power to feed the ignition exciters directly. The other path uses System B to provide power from the battery bus through a static inverter, which converts DC to the AC needed by the ignition system. This setup gives redundancy: if AC power is lost, the ignition can still operate via the inverter-backed path, and vice versa. Relying on a single source like battery power alone, or on APU or a single generator without this paired arrangement, wouldn’t guarantee ignition in all failure scenarios.

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