What is the first step a firefighter should perform before donning the self-contained breathing apparatus (SCBA)?

Before donning the self-contained breathing apparatus (SCBA), the first step a firefighter should perform is to check the air supply of the SCBA unit. This is crucial because ensuring that there is sufficient air in the tank is fundamental for the safety of the firefighter. If the air supply is low or empty, it could lead to dangerous situations where the firefighter may not have enough breathable air to complete their operations, which can be critical during an emergency response where conditions may deteriorate rapidly.

Checking the air supply ensures that the firefighter can operate confidently and safely within hazardous environments. It is part of a systematic approach to equipment safety and preparedness, establishing that the SCBA is functional and ready for immediate use. Other checks, such as inspecting the face mask, ensuring straps are secure, and attaching the regulator correctly, while important, come after confirming that there is a full air supply since there is no point in donning the SCBA if it does not have adequate air.