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Will a striped bar illuminate in the Essential Power Button if it is pressed in an electrical emergency? Why?

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Final answer:

The Essential Power Button illuminates with a striped bar to indicate activation during electrical emergencies in aircraft, ensuring essential systems are powered and non-essential ones are not.

Step-by-step explanation:

The Essential Power Button is typically found in aircraft cockpits and is used in electrical emergencies to isolate the essential power bus from non-essential systems.

When this button is pressed, a striped bar, usually illuminated, indicates that the button has been activated and that the essential electrical systems are powered, while non-essential systems are not. The illumination serves a critical role in allowing pilots to quickly confirm that the button has successfully engaged under emergency conditions, where cockpit lighting or visibility might be limited.

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