When does seated donning of SCBA begin?

Seated donning of the Self-Contained Breathing Apparatus (SCBA) begins when the firefighter is ready with the seatbelt, headset, and SCBA in position. This indicates that the firefighter is preparing to don the equipment in a safe and organized manner, ensuring that all necessary components for both safety and communication are in place before they commence donning the SCBA. This approach maximizes efficiency and safety, enabling firefighters to be fully equipped and ready to respond upon arrival at an incident.

This option emphasizes the importance of preparation and readiness, as the firefighter needs to secure their seatbelt for safety, put on their headset for communication, and have their SCBA within reach to don appropriately. The other options do not capture the comprehensive readiness required for seated donning. For example, simply securing the seatbelt does not imply that the SCBA is being donned, and waiting for the vehicle to park might introduce unnecessary delay in readiness. Thus, option B encapsulates the critical elements of preparation and safety in the seated donning process.