During which conditions would a pilot expect specific lights to function automatically?

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The specific lights on an aircraft are designed to function automatically during a power failure to ensure safety and visibility. In such a situation, these lights are crucial as they provide the necessary illumination for emergency evacuation procedures and guide the crew and passengers. The aircraft's emergency lighting system is typically powered by a backup battery that activates automatically when a loss of primary electrical power occurs. This ensures that emergency procedures can be executed without delay, significantly increasing the safety of everyone on board.

The other conditions, such as routine maintenance or situations where only one AC bus is operational, may not trigger an automatic response from the emergency lighting system. Likewise, if the EMER EXT LT switch is in the OFF position, the emergency exterior lights would not operate, as they are designed to activate when the switch is set to ON or when certain emergency criteria are met.

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