Which DC Bus is designated for emergency power supply?

Which DC Bus is designated for emergency power supply?

• A. DC Emergency Bus
• B. DC Essential Bus
• C. DC Service Bus
• D. DC Utility Bus

Answer: (A)

In an electrical emergency, power must stay with the systems that keep the aircraft controllable and safe to land. A dedicated DC bus is powered by an independent emergency source so it can continue to feed critical equipment even when the normal power distribution fails. That bus is the DC Emergency Bus, and it supplies essential flight deck instruments, navigation and communication equipment, and other systems required to maintain safe flight. Other DC buses handle nonessential or normal-load equipment and are typically shed or deprived of power during emergencies, which is why this particular bus is designated for emergency power.

In an electrical emergency, power must stay with the systems that keep the aircraft controllable and safe to land. A dedicated DC bus is powered by an independent emergency source so it can continue to feed critical equipment even when the normal power distribution fails. That bus is the DC Emergency Bus, and it supplies essential flight deck instruments, navigation and communication equipment, and other systems required to maintain safe flight. Other DC buses handle nonessential or normal-load equipment and are typically shed or deprived of power during emergencies, which is why this particular bus is designated for emergency power.