In an electrical emergency, activating the button results in which outcome?

In an electrical emergency, activating the button results in which outcome?

• A. Power is redirected to non-essential buses.
• B. Emergency configuration is avoided.
• C. Batteries power only the Essential Buses.
• D. All buses revert to external power.

Answer: (C)

In an electrical emergency, the system shifts to preserve power for the stuff you absolutely need to fly and operate the airplane. Activating the emergency control reconfigures power so the battery feeds only the Essential Buses, keeping critical equipment—like flight instruments, flight controls, and essential avionics—powered while non-essential loads are shed to conserve energy. This approach prevents the battery from trying to run everything at once, which would quickly deplete it and could leave you without key systems. External power isn’t relied on in this mode, and the purpose isn’t to keep all buses powered or to avoid the emergency state—the goal is to ensure the essentials stay alive from the battery for as long as possible.

In an electrical emergency, the system shifts to preserve power for the stuff you absolutely need to fly and operate the airplane. Activating the emergency control reconfigures power so the battery feeds only the Essential Buses, keeping critical equipment—like flight instruments, flight controls, and essential avionics—powered while non-essential loads are shed to conserve energy.

This approach prevents the battery from trying to run everything at once, which would quickly deplete it and could leave you without key systems. External power isn’t relied on in this mode, and the purpose isn’t to keep all buses powered or to avoid the emergency state—the goal is to ensure the essentials stay alive from the battery for as long as possible.