What must firefighters ensure during SCBA checks?

During SCBA checks, it is essential for firefighters to ensure that the SCBA (Self-Contained Breathing Apparatus) is in working condition. This step is critical because the SCBA is a vital piece of equipment that provides breathable air in environments that are immediately dangerous to life or health, such as during firefighting operations.

Ensuring the SCBA is functioning properly involves checking various components, including the air tank, masks, and valves, to verify that there are no leaks and that all systems are operational. A malfunctioning SCBA could jeopardize a firefighter's safety, making this check an imperative part of their safety protocol before engaging in operations.

While having all team members present, conducting annual upgrades, and ensuring an adequate water supply are important in the overall operation of a firefighting team, they are not the primary focus during SCBA checks. The immediate risk associated with having a non-functional SCBA underlines why it is paramount for firefighters to confirm its operational status first and foremost.