During electrical faults, how is power prioritized?

During electrical faults, how is power prioritized?

• A. All buses are powered equally.
• B. Essential buses power critical avionics; nonessential loads are shed to conserve power for essential systems.
• C. Nonessential loads are the first to be powered.
• D. Power is provided only by battery.

Answer: (B)

During electrical faults the system prioritizes keeping the most important functions powered. Essential buses deliver power to critical avionics and flight systems, while nonessential loads are shed to conserve energy and prevent undervoltage on those critical systems. This means that avionics and flight-critical equipment stay powered to maintain control, navigation, and communications, even as less critical systems like cabin lighting or nonessential electronics are turned off or reduced. The idea is to preserve power for the systems that keep the aircraft controllable and safe, using available sources (generators, APU, and battery) to support the essential network first.

During electrical faults the system prioritizes keeping the most important functions powered. Essential buses deliver power to critical avionics and flight systems, while nonessential loads are shed to conserve energy and prevent undervoltage on those critical systems. This means that avionics and flight-critical equipment stay powered to maintain control, navigation, and communications, even as less critical systems like cabin lighting or nonessential electronics are turned off or reduced. The idea is to preserve power for the systems that keep the aircraft controllable and safe, using available sources (generators, APU, and battery) to support the essential network first.