What signals indicate the presence of smoke or fire in the AFT lavatory on the ERJ 175?

The presence of smoke or fire in the AFT lavatory on the ERJ 175 is indicated by a flashing orange light and an aural signal. This specific signaling system is designed to ensure that flight crew members are immediately alerted to potential danger, allowing for swift action to be taken to address the situation.

The choice of a flashing orange light serves as a visual warning that is easily recognizable, while the accompanying aural signal provides an auditory alert that can capture the attention of crew members even in a busy or noisy environment. This two-pronged alert system enhances situational awareness and provides crucial information about potential hazards.

In contrast, other options do not accurately represent the warning system designed for the AFT lavatory. A flashing red light with a continuous alarm would indicate a different emergency, one requiring immediate attention, while a steady light with no sound would not effectively communicate the urgency of a smoke or fire situation. Likewise, while a visual and tactile alert could be beneficial in some contexts, it is not the designated alert system for this specific emergency scenario in the ERJ 175.