The backup hot bus includes which components?

The backup hot bus includes which components?

• A. Left DC Bus and Right DC Bus
• B. SHED BUSES and GCUS
• C. GCUS and EDL
• D. GPU and EDL

Answer: (C)

In this system, the backup hot bus is a dedicated power path that keeps essential avionics energized when normal power sources are unavailable. The components that make up this bus are the Generator Control Units (GCUs) and the Electrical Distribution Logic (EDL). The GCUs manage generator operation and protection, ensuring the generators deliver power correctly and switch to the backup path as needed. The EDL provides the logic and routing to distribute power to the critical loads on the backup bus, keeping those essential systems hot while other nonessential loads can be isolated or shed. Other options don’t fit because they rely on different parts of the electrical system: main left and right DC buses are the primary distribution rails, not the backup hot bus; a Ground Power Unit is a power source used on the ground rather than a component that forms the backup bus itself; and SHED BUSES isn’t the set of components that comprises the backup hot bus.

In this system, the backup hot bus is a dedicated power path that keeps essential avionics energized when normal power sources are unavailable. The components that make up this bus are the Generator Control Units (GCUs) and the Electrical Distribution Logic (EDL). The GCUs manage generator operation and protection, ensuring the generators deliver power correctly and switch to the backup path as needed. The EDL provides the logic and routing to distribute power to the critical loads on the backup bus, keeping those essential systems hot while other nonessential loads can be isolated or shed.

Other options don’t fit because they rely on different parts of the electrical system: main left and right DC buses are the primary distribution rails, not the backup hot bus; a Ground Power Unit is a power source used on the ground rather than a component that forms the backup bus itself; and SHED BUSES isn’t the set of components that comprises the backup hot bus.