On the ground with the batteries as the only power source, do you have shed bus power?

On the ground with the batteries as the only power source, do you have shed bus power?

• A. Yes
• B. No
• C. Only if APU is available
• D. Only if gens are online

Answer: (B)

With the batteries as the only power source, you do not have shed bus power. The shed bus is fed by a primary power source such as an APU, aircraft generators, or external ground power. The battery alone only supports essential systems and onboard memory; it cannot energize the shed bus. If an APU or generators (or ground power) were online, the shed bus could be powered, but in this ground condition with batteries only, it remains unpowered.

With the batteries as the only power source, you do not have shed bus power. The shed bus is fed by a primary power source such as an APU, aircraft generators, or external ground power. The battery alone only supports essential systems and onboard memory; it cannot energize the shed bus. If an APU or generators (or ground power) were online, the shed bus could be powered, but in this ground condition with batteries only, it remains unpowered.