What is a common feature of the emergency alert system in aircraft?

A common feature of the emergency alert system in aircraft is the use of both visual and auditory signals. This dual signaling approach is essential for ensuring that the alert is noticed and understood by the crew and passengers, especially in critical situations where attention must be drawn quickly to important information. Visual signals, such as flashing lights or screens displaying alerts, complement auditory signals like alarms or announcements. Together, they enhance the overall effectiveness of the emergency communication system, ensuring that it can reach individuals regardless of their location within the aircraft or their current activity.

Using only auditory or only visual signals can be limiting, particularly in high-noise environments or situations where visibility is compromised, which is why the combination of both is critical for optimal safety and response in emergencies.