The APU is electrically connected to which DC bus?

The APU is electrically connected to which DC bus?

• A. Left DC Bus
• B. Right DC Bus
• C. The Central DC Bus
• D. SHED BUSES

Answer: (C)

The central DC bus is the point where the APU’s electrical power is connected. On the ERJ-145, the APU provides power to this central bus so that essential systems and avionics have a reliable DC source when engine generators aren’t online or during start. From the central bus, power can be shared with the left and right DC buses through the bus ties as needed, but the APU’s feed is specifically routed to the central bus to establish a common, controllable power source for critical loads. Left and right DC buses are normally driven by their respective engine generators, not directly by the APU, and SHED BUSES aren’t the standard APU connection point.

The central DC bus is the point where the APU’s electrical power is connected. On the ERJ-145, the APU provides power to this central bus so that essential systems and avionics have a reliable DC source when engine generators aren’t online or during start. From the central bus, power can be shared with the left and right DC buses through the bus ties as needed, but the APU’s feed is specifically routed to the central bus to establish a common, controllable power source for critical loads. Left and right DC buses are normally driven by their respective engine generators, not directly by the APU, and SHED BUSES aren’t the standard APU connection point.