The Emergency Generator can power which busses?

The Emergency Generator can power which busses?

• A. All Buses
• B. AC Essential And DC Essential Buses
• C. Only AC Buses
• D. Only DC Buses

Answer: (B)

In an electrical emergency, only the loads that keep the aircraft controllable and safe are kept powered. The emergency generator is dedicated to supplying the essential power buses, specifically both the AC essential bus and the DC essential bus. This design ensures critical systems—such as primary flight instruments, rudder and flight-control signals, and essential avionics—remain powered even when the main generators are lost. Non-essential buses are not fed by the emergency generator to avoid overloading it and to conserve power for the critical systems. So the emergency generator powers the AC essential and DC essential buses.

In an electrical emergency, only the loads that keep the aircraft controllable and safe are kept powered. The emergency generator is dedicated to supplying the essential power buses, specifically both the AC essential bus and the DC essential bus. This design ensures critical systems—such as primary flight instruments, rudder and flight-control signals, and essential avionics—remain powered even when the main generators are lost. Non-essential buses are not fed by the emergency generator to avoid overloading it and to conserve power for the critical systems. So the emergency generator powers the AC essential and DC essential buses.