Which AC Bus powers the Main Battery Charger?

Which AC Bus powers the Main Battery Charger?

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

Answer: (A)

Charging the main battery relies on an AC power feed from a dedicated AC bus. In this aircraft, the Main Battery Charger is connected to AC Bus 1, so when AC power is available on that bus (from ground power, the APU, or generators), the charger receives power and can actively charge the main battery. The other buses serve different purposes—AC Bus 2 powers other systems, the AC Service Bus supplies nonessential equipment, and the Essential Bus handles critical loads—so they aren’t the path used to charge the main battery. If AC Bus 1 isn’t energized, the charger can’t operate, though essential systems may still be powered by other sources.

Charging the main battery relies on an AC power feed from a dedicated AC bus. In this aircraft, the Main Battery Charger is connected to AC Bus 1, so when AC power is available on that bus (from ground power, the APU, or generators), the charger receives power and can actively charge the main battery. The other buses serve different purposes—AC Bus 2 powers other systems, the AC Service Bus supplies nonessential equipment, and the Essential Bus handles critical loads—so they aren’t the path used to charge the main battery. If AC Bus 1 isn’t energized, the charger can’t operate, though essential systems may still be powered by other sources.