What does the AC ESS XFER switch light do when selected?

• A. Shuts Off ESS Bus
• B. Transfers The AC ESS Bus To AC Bus 2
• C. Powers The Hydraulic System
• D. Activates External Power

Answer: (B)

The AC ESS XFER switch light indicates moving the source of the essential AC bus to an alternate power source, typically AC Bus 2. When you select it, the essential bus is transferred so critical systems stay powered even if the normal source is unavailable. The light confirms that this transfer is active. It doesn’t shut off the essential bus, it doesn’t power the hydraulic system, and it isn’t related to activating external power. So the function described is transferring the AC essential bus to AC Bus 2.