What are signs of potential cabin depressurization?

Signs of potential cabin depressurization include sudden drops in cabin pressure readings alongside physical discomfort. When cabin pressure decreases unexpectedly, passengers and crew may experience a variety of symptoms due to the rapid change in pressure. These can include difficulties in breathing, ear pain, and general discomfort, which are common physiological reactions to a lack of adequate oxygen levels at altitude. Monitoring cabin pressure readings is crucial because they provide objective data about the aircraft's pressurization status. When these readings drop suddenly, it signals a potential issue that needs immediate attention.

The other options do not directly indicate cabin depressurization. For instance, a sudden fuel leak and engine noise relate more to engine performance and fuel system integrity. A decrease in airspeed and altitude may point to broader aircraft control problems but does not specifically signify cabin pressure issues. Fluctuating electrical systems may indicate electrical malfunctions but are not connected to cabin pressure directly. Therefore, the combination of sudden drops in cabin pressure readings and physical discomfort is a clear indicator of possible cabin depressurization.