During normal engine operation, how is the FADEC powered?

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Multiple Choice

During normal engine operation, how is the FADEC powered?

The FADEC is normally powered by the engine’s own electrical generator mounted on the accessory gearbox. This engine-driven generator provides a clean, regulated power supply (typically 28 V DC) as long as the engine is turning, so the FADEC has a stable source that tracks engine speed and remains independent of ground power or aircraft batteries. External power, the APU, or batteries are used in special situations (start, ground operations, emergencies) but aren’t the normal source during operation, because the engine-driven generator ensures consistent, self-contained power directly tied to the engine.

The FADEC is normally powered by the engine’s own electrical generator mounted on the accessory gearbox. This engine-driven generator provides a clean, regulated power supply (typically 28 V DC) as long as the engine is turning, so the FADEC has a stable source that tracks engine speed and remains independent of ground power or aircraft batteries. External power, the APU, or batteries are used in special situations (start, ground operations, emergencies) but aren’t the normal source during operation, because the engine-driven generator ensures consistent, self-contained power directly tied to the engine.

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