When does Segment 3 begin flashing?

Segment 3 begins flashing when the pressure reaches its specified range, which indicates that the SCBA is functioning within the operational parameters needed for safety. This flashing serves as a visual alert for the user to monitor their air supply and to be aware of their remaining air capacity.

The specified range is typically designed to signal when the SCBA is transitioning into a lower pressure state. This alert system ensures that the user is informed in a timely manner to take necessary actions, such as exiting a hazardous environment or switching to a reserve supply if available. Being aware of these pressure levels is crucial for operational safety and effective use of the SCBA in emergency situations.