FADECs power source under 50% N2 with PMA above 50% N2?

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Multiple Choice

FADECs power source under 50% N2 with PMA above 50% N2?

Explanation:
Power for FADEC is managed with a priority that depends on engine speed. The Permanent Magnet Alternator (PMA) is designed to feed the FADEC only once the engine N2 passes a certain threshold (around 50%). When the engine is below that threshold, the FADEC is supplied from the aircraft’s DC electrical system to ensure a stable, regulated power source during start and idle. Even if the PMA is capable at higher speeds, at low N2 the PMA does not power the FADEC, so the DC electric system takes over. The AC bus, the battery direct feed, or the hydraulic system aren’t the sources used to power the FADEC in this condition.

Power for FADEC is managed with a priority that depends on engine speed. The Permanent Magnet Alternator (PMA) is designed to feed the FADEC only once the engine N2 passes a certain threshold (around 50%). When the engine is below that threshold, the FADEC is supplied from the aircraft’s DC electrical system to ensure a stable, regulated power source during start and idle. Even if the PMA is capable at higher speeds, at low N2 the PMA does not power the FADEC, so the DC electric system takes over. The AC bus, the battery direct feed, or the hydraulic system aren’t the sources used to power the FADEC in this condition.

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