When should firefighters not stand or attempt to dismount the apparatus?

Firefighters should not stand or attempt to dismount the apparatus while it is still moving because doing so poses a significant risk of injury. When the apparatus is in motion, the potential for falling or getting caught in the equipment increases drastically. Firefighters are trained to ensure their safety as well as the safety of their crew, and dismounting from a moving vehicle compromises this. It is essential for firefighters to wait until the apparatus has come to a complete stop before attempting to disembark, allowing for secure footing and minimizing the risk of accidents.

Regarding the other scenarios, while responding to a call typically involves urgency, it does not inherently indicate a reason to stand or dismount from a moving vehicle. In adverse weather conditions like a rainstorm, safety protocols would still prioritize remaining seated until the vehicle is stopped rather than attempting to dismount. Additionally, feeling unwell is certainly a cause for caution and may impact a firefighter's ability to operate safely, but it does not relate directly to the timing of dismounting a moving apparatus.