What indicates a low air supply while using the MSA G1 SCBA?

The correct answer is indicated by the audible and visual alarms. In the MSA G1 Self-Contained Breathing Apparatus, these alarms serve as essential safety features designed to alert the user when the air supply is depleting to a critically low level. The audible alarms typically produce a loud sound that can be easily heard even in noisy environments, while visual alarms often include flashing lights that are highly noticeable, ensuring that the user is promptly made aware of the situation.

This dual-alert system is crucial for maintaining situational awareness during operations in potentially hazardous environments, where the user may not be able to frequently check their air gauge. The combination of auditory and visual cues is designed to grab attention quickly, allowing for timely action either to exit the dangerous area or to switch to a secondary air source before running out of breathable air.

The other options do not serve the purpose of indicating low air supply effectively. An increase in temperature may suggest other environmental factors but does not specifically correlate with air supply levels. A flashing light signal is part of the visual alarm system but not the sole indication; it is often accompanied by audible signals. Lastly, a change in the color of the facepiece is not a feature of the MSA G1 SCBA and does not