What is a common indicator of a fully functional SCBA?

A fully functional SCBA is characterized by the absence of leaks and the proper functioning of alarms. When the SCBA is in optimal condition, it should effectively seal to prevent any air leaks, ensuring that the user has a reliable source of breathable air. Additionally, functioning alarms are crucial as they alert the wearer to potential issues, such as low air pressure, enhancing safety during use. This combination of features confirms that the SCBA is ready for operation and can be trusted to protect the user in hazardous environments.

While options that mention leaks, non-functioning alarms, or partially charged cylinders highlight potential problems, they do not describe the ideal operational state of an SCBA. The emphasis on both leak prevention and alarm functionality embodies the critical safety standards expected from this life-saving equipment.