What is the primary risk of using an SCBA that has not been properly checked?

The primary risk of using an SCBA that has not been properly checked lies in the potential for insufficient breathable air. A thorough inspection is critical to ensure that all components of the SCBA are functioning correctly and that the air supply is secure and sufficient for the intended use. If there is a failure in the system, whether due to a leak, a malfunctioning pressure gauge, or a compromised air cylinder, users might find themselves without adequate breathable air in a hazardous environment. This can lead to serious health risks, as firefighters and emergency responders could become incapacitated or face life-threatening situations if their air supply is compromised. Proper checks, including verifying the integrity of the air supply and ensuring all safety features are operational, are essential to maintaining safety while using the SCBA.