What should be done with the air supply of a downed firefighter if they are found unconscious?

Connecting a full cylinder if needed is the most appropriate action for the air supply of a downed firefighter who is found unconscious. In emergency situations, keeping the firefighter's air supply adequately provided is critical, especially if they're unable to breathe or if their air supply has been compromised. The ability for rescuers to ensure that the downed firefighter has access to breathable air is essential for their chances of survival and recovery.

When a firefighter is unconscious, their airway may become obstructed or they may not be capable of effectively using their existing air supply. By connecting a full cylinder, rescuers can help maintain the oxygen supply to the unconscious firefighter, which is crucial in preventing further hypoxia and potential brain damage due to lack of oxygen.

While evaluating breathing patterns and monitoring for distress signals are important components of assessing a victim's condition, they are secondary to ensuring that the firefighter has a sufficient air supply at that critical moment. Waiting for medical assistance, although necessary afterward, does not address the immediate need for oxygen, making it vital to connect a full air cylinder if required.