What is the purpose of the evacuation horn?

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The evacuation horn is used to prompt immediate evacuation. Its loud, distinct sound is designed to cut through cabin noise and grab the attention of everyone on board so passengers and crew start moving toward the nearest exits without hesitation. This signal is specifically associated with initiating rapid egress and, in many systems, coordinating actions like slide deployment and orderly departure. It isn’t the method for warning about approaching weather, and it isn’t a cue to start a cabin lighting sequence—those are handled by other systems. While it does alert aircrew as well, its primary purpose is to trigger evacuation.