What should you do if you feel a significant weight change in the SCBA cylinder during use?

When you feel a significant weight change in the SCBA cylinder during use, it is crucial to monitor your air supply and prepare to exit the hazardous area. A noticeable weight change usually indicates that you are running low on air, which can compromise your safety in an emergency situation. Keeping track of your air supply is vital, as running out of air can lead to severe consequences in environments filled with smoke or toxic gases. By preparing to exit the hazardous area, you are taking proactive steps to ensure your safety and that of your team.

The other options would not be appropriate responses in this scenario. Continuing to use the SCBA as normal without addressing the significant weight change could put you at risk of losing the air supply. Checking for leaks while still in the hazardous area could expose you to further danger rather than prioritizing your safe exit. Adjusting the straps for better support may provide temporary comfort but does not address the crucial issue of air supply availability.