Which is the first step in the procedure for donning the MSA G1 SCBA?

The first step in the procedure for donning the MSA G1 SCBA is checking the harness. This step is crucial because ensuring that the harness is correctly adjusted and functioning properly is essential for the safety and comfort of the user. A well-fitted harness will help distribute the weight of the SCBA evenly, which is important for maintaining mobility and stability during operations.

Before any other steps, checking the harness allows the user to identify any issues that could affect the SCBA’s performance or the user's comfort during use. If the harness is not secure or is improperly adjusted, it might lead to difficulties while wearing the SCBA or in emergency situations, potentially compromising effectiveness and safety.

Once the harness has been checked and confirmed to fit well, the user can proceed with securing the cylinder, placing the facepiece on, and adjusting the straps for fit, all of which are important but come after ensuring the harness is ready for use.