ERJ-145 Electrical Practice Test

Which of the following is NOT powered by the Ground Service Bus?

Galley lights Cockpit dome lights Baggage/service compartment lights Flight deck oxygen system

Correct Answer:

Flight deck oxygen system

Explanation:

Ground Service Bus powers nonessential cabin services when external power is available, so items like galley lights, cockpit dome lights, and baggage/service compartment lights are fed by it to aid servicing and passenger comfort on the ground. The flight deck oxygen system, however, is part of the emergency crew oxygen supply and must function independently of normal ground power. It relies on its own gas supply and regulators rather than electrical power from the Ground Service Bus, ensuring breathable air for the crew even if other electrical power is unavailable. That independence is why the flight deck oxygen system is the correct choice for NOT being powered by the Ground Service Bus.

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