Which lights activate when the EMER EXT LT switch is in the ARM position and normal electrical power fails?

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When the EMER EXT LT switch is set to the ARM position and normal electrical power fails, the system is designed to activate essential emergency lighting to ensure safety and guidance in critical situations. This includes the overhead emergency lights, aisle escape lights, and exterior lights, which illuminate the exits and pathways to facilitate passenger evacuation.

Overhead emergency lights provide illumination in the cabin, helping passengers and crew to see in the event of a power failure. Aisle escape lights guide the way along the aisles towards exits, making it easier for passengers to evacuate the aircraft. The exterior lights, when activated, enhance visibility from the outside and help rescue teams locate and assist the aircraft.

In contrast, options that refer to cabin lights and seatbelt signs, landing lights and strobe lights, or navigation and logo lights do not align with the functionality of the EMER EXT LT switch during emergency scenarios. Cabin lights and seatbelt signs are typically powered by the normal electrical system and do not function if power fails. Landing and strobe lights are not part of the emergency lighting and would not operate under this scenario, nor would navigation and logo lights serve the necessary purpose intended during an emergency situation.

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