After pressing the Essential Power Button, which loads remain powered?

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Study for the ERJ-145 Electrical Test. Gain knowledge with quizzes featuring flashcards and multiple choice questions, complete with hints and explanations. Prepare confidently for your exam!

Multiple Choice

After pressing the Essential Power Button, which loads remain powered?

Explanation:
Pressing the Essential Power Button switches the electrical system into essential-power mode, where only the essential electrical buses remain energized. This conserves power by shedding all nonessential loads, while keeping critical systems—such as flight controls, navigation, avionics, communications, and standby instruments—powered. The power for those essential buses can come from the external source or the APU, but the defining outcome is that only the essential buses stay energized. Nonessential devices are intentionally de-energized under this mode.

Pressing the Essential Power Button switches the electrical system into essential-power mode, where only the essential electrical buses remain energized. This conserves power by shedding all nonessential loads, while keeping critical systems—such as flight controls, navigation, avionics, communications, and standby instruments—powered. The power for those essential buses can come from the external source or the APU, but the defining outcome is that only the essential buses stay energized. Nonessential devices are intentionally de-energized under this mode.

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