When N2 exceeds 50%, which component powers the FADEC PMA alternator?

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Multiple Choice

When N2 exceeds 50%, which component powers the FADEC PMA alternator?

Explanation:
Powering FADEC reliably uses a dedicated source. When N2 climbs past 50%, the FADEC receives its power from a dedicated FADEC PMA alternator, a purpose-built supply that feeds the FADEC separately from the main electrical system. This arrangement keeps engine control stable even if the main generator is loaded heavily or not delivering full power yet. Relying on the main generator for FADEC power could risk FADEC performance during critical phases, and the battery is only a limited backup, not the normal source for FADEC power in this regime. The auxiliary power unit can provide electrical power in other situations, but the design here specifically uses the dedicated FADEC PMA alternator as the FADEC power source when N2 exceeds 50%.

Powering FADEC reliably uses a dedicated source. When N2 climbs past 50%, the FADEC receives its power from a dedicated FADEC PMA alternator, a purpose-built supply that feeds the FADEC separately from the main electrical system. This arrangement keeps engine control stable even if the main generator is loaded heavily or not delivering full power yet. Relying on the main generator for FADEC power could risk FADEC performance during critical phases, and the battery is only a limited backup, not the normal source for FADEC power in this regime. The auxiliary power unit can provide electrical power in other situations, but the design here specifically uses the dedicated FADEC PMA alternator as the FADEC power source when N2 exceeds 50%.

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