Which of the following is a common indicator of low air supply in SCBA?

Audible alarms are a crucial feature of Self-Contained Breathing Apparatus (SCBA) systems designed specifically to alert users when the air supply is running low. These alarms serve as a reliable warning mechanism, providing an audible signal that can be immediately recognized by the wearer, even in a chaotic or noisy environment. The purpose of these alarms is to ensure that the user is made aware of their air supply status without needing to visually check the equipment, which may not always be possible in emergency situations.

In contrast to the correct answer, the other options do not effectively indicate low air supply. Flashing lights may be present in various safety equipment but are not specifically identified as a common low air supply indicator in SCBA use. Weight reduction of the tank could occur as air is consumed; however, it is not a practical or immediate method for identifying low air levels, as users typically rely on alarms and pressure gauges. A temperature increase on the mask might indicate other issues within the SCBA system but is not a standard indicator of low air supply. Therefore, the audible alarms are the most direct and effective means of informing the user of a low air supply condition.