If ESS TRU 1&2 fail, how much would the DC Essential Bus remain powered?

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Multiple Choice

If ESS TRU 1&2 fail, how much would the DC Essential Bus remain powered?

Explanation:
The essential DC bus relies on dedicated power sources to keep critical systems alive. Normally it’s fed by ESS transformer-rectifier units, but if ESS TRU 1 and 2 both fail, those primary sources are gone. The remaining power path designed to keep the essential bus alive in that situation is the Air Driven Generator. When the ADG is available and deployed, it provides power to the DC Essential Bus, ensuring it remains energized for essential systems. The other options imply power would come from sources that aren’t there in this fault condition, or that the bus would drop out immediately, which isn’t the case because the ADG serves as the emergency power source for the DC Essential Bus.

The essential DC bus relies on dedicated power sources to keep critical systems alive. Normally it’s fed by ESS transformer-rectifier units, but if ESS TRU 1 and 2 both fail, those primary sources are gone. The remaining power path designed to keep the essential bus alive in that situation is the Air Driven Generator. When the ADG is available and deployed, it provides power to the DC Essential Bus, ensuring it remains energized for essential systems. The other options imply power would come from sources that aren’t there in this fault condition, or that the bus would drop out immediately, which isn’t the case because the ADG serves as the emergency power source for the DC Essential Bus.

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