How many AC Buses are there and what are they?

How many AC Buses are there and what are they?

• A. AC Bus 1, AC Bus 2, AC Essential Bus, AC Service Bus
• B. AC Bus 1, AC Bus 2, AC Essential Bus, AC Service Bus, ADG Bus
• C. AC Bus 1, AC Bus 2, AC Essential Bus
• D. AC Bus 1, AC Bus 2, AC Service Bus, ADG Bus

Answer: (B)

The question tests your knowledge of the airplane’s AC power distribution and which buses carry AC power. There are five AC buses: AC Bus 1, AC Bus 2, AC Essential Bus, AC Service Bus, and the ADG Bus. In normal operation, two engine-driven generators feed AB1 and AB2, while the AC Essential Bus powers the most critical systems if power is constrained. The AC Service Bus provides power for maintenance and service items, and the ADG Bus is the output of the Air Driven Generator, which can power essential circuits during certain conditions (emergency/standby). Since the ADG’s output is AC and routed to its own bus, it’s counted among the AC buses.

The question tests your knowledge of the airplane’s AC power distribution and which buses carry AC power. There are five AC buses: AC Bus 1, AC Bus 2, AC Essential Bus, AC Service Bus, and the ADG Bus. In normal operation, two engine-driven generators feed AB1 and AB2, while the AC Essential Bus powers the most critical systems if power is constrained. The AC Service Bus provides power for maintenance and service items, and the ADG Bus is the output of the Air Driven Generator, which can power essential circuits during certain conditions (emergency/standby). Since the ADG’s output is AC and routed to its own bus, it’s counted among the AC buses.