How long will the battery supply power to the internal and external emergency lights?

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Multiple Choice

How long will the battery supply power to the internal and external emergency lights?

Emergency lighting after a loss of normal power is designed to stay on long enough to evacuate the aircraft. The internal cabin lights and external emergency lights are powered by a dedicated battery system that automatically engages when power fails. For most commercial airplanes, this battery is designed to supply both sets of lights for fifteen minutes. That duration gives crews time to guide passengers to exits and complete the evacuation even if conditions are challenging. A shorter duration, like ten minutes, might not cover the full evacuation in all scenarios, while longer durations such as thirty or sixty minutes would require a larger battery and aren’t the standard requirement for this system.

Emergency lighting after a loss of normal power is designed to stay on long enough to evacuate the aircraft. The internal cabin lights and external emergency lights are powered by a dedicated battery system that automatically engages when power fails. For most commercial airplanes, this battery is designed to supply both sets of lights for fifteen minutes. That duration gives crews time to guide passengers to exits and complete the evacuation even if conditions are challenging. A shorter duration, like ten minutes, might not cover the full evacuation in all scenarios, while longer durations such as thirty or sixty minutes would require a larger battery and aren’t the standard requirement for this system.

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