In the event of a charged battery being installed, the hot battery bus becomes powered. Which option correctly states this condition?

• A. When a charged battery is installed in the aircraft
• B. Only when external power is connected
• C. Only when the engine is running
• D. Only if the battery is discharging

Answer: (A)

The hot battery bus is energized by the presence of a valid voltage source from the aircraft’s battery. When a charged battery is installed, it provides that voltage to the hot bus, making it powered without needing external power or the engine to be running. The key is that the battery is connected and has sufficient charge to supply the bus. If the battery isn’t installed or is too low in voltage, the hot bus wouldn’t be energized unless another power source takes over. So, the condition described is simply installing a charged battery.