What should you do first if you hear a high pitched noise indicating a potential air leak?

When you hear a high-pitched noise that suggests a potential air leak, the first step should be to investigate the source of the noise. This is crucial because identifying the source allows for a assessment of the situation before taking further action. Understanding where the noise is coming from can provide vital information regarding the severity of the leak and whether it poses an immediate danger to the aircraft and its passengers.

Investigating the source also enables the crew to determine the necessary actions to take next. For instance, if the leak is minor and contained, there may be no need for evacuation or immediate concerns over cabin pressure. However, if it is serious, the crew can then make informed decisions regarding the safety of the aircraft's occupants while ensuring an organized and systematic response.

Addressing the other options, checking cabin pressure may be relevant after ascertaining the source of the noise, but it is not the immediate action to take. Conducting a visual inspection of exits and evacuating passengers could potentially lead to panic or confusion if the situation is not severe. Therefore, approaching the situation methodically by first investigating the noise is the most prudent action.