When on Battery Power, which Dome light can be turned on?

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Multiple Choice

When on Battery Power, which Dome light can be turned on?

Explanation:
When power is limited to the battery, only lights on the emergency/standby electrical circuit can operate. The right-hand dome light is wired to that emergency circuit, so it can be turned on under battery power. The other dome lights draw from the normal electrical system and are not powered when only the battery is supplying power, so they won’t illuminate. This arrangement ensures essential visibility for the crew during an electrical failure without draining the battery with all cabin lights.

When power is limited to the battery, only lights on the emergency/standby electrical circuit can operate. The right-hand dome light is wired to that emergency circuit, so it can be turned on under battery power. The other dome lights draw from the normal electrical system and are not powered when only the battery is supplying power, so they won’t illuminate. This arrangement ensures essential visibility for the crew during an electrical failure without draining the battery with all cabin lights.

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