How is the FADEC powered when engine N2 is below 50%?

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Prepare for the GoJet Airlines CRJ-550 Test. Use flashcards, multiple choice questions, and detailed explanations to ace your exam!

Multiple Choice

How is the FADEC powered when engine N2 is below 50%?

Explanation:
FADEC power must stay reliable even when the engine isn’t generating electrical power at low speeds. On the CRJ-550, when N2 falls below 50%, the FADEC is fed from the AC Essential Bus. This bus is kept energized by alternate sources (such as the APU or external power) so engine control remains uninterrupted as the engine transitions through low-power conditions. The other options don’t provide the FADEC with power in this scenario: there isn’t a separate FADEC alternator to rely on when the engine isn’t producing, the APU Battery Direct Bus powers APU-related systems rather than the FADEC, and the DC Emergency Bus is for DC loads during an electrical emergency, not for normal FADEC power.

FADEC power must stay reliable even when the engine isn’t generating electrical power at low speeds. On the CRJ-550, when N2 falls below 50%, the FADEC is fed from the AC Essential Bus. This bus is kept energized by alternate sources (such as the APU or external power) so engine control remains uninterrupted as the engine transitions through low-power conditions. The other options don’t provide the FADEC with power in this scenario: there isn’t a separate FADEC alternator to rely on when the engine isn’t producing, the APU Battery Direct Bus powers APU-related systems rather than the FADEC, and the DC Emergency Bus is for DC loads during an electrical emergency, not for normal FADEC power.

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