The statement "The hood is to be worn under the SCBA facepiece" is:

Wearing the hood under the SCBA facepiece is not standard practice because the hood is designed to provide additional protection and insulation for the head and neck, while the facepiece of the SCBA must create a tight seal around the face to ensure the integrity of the air supply. If the hood is worn underneath the facepiece, it can compromise the seal, potentially allowing smoke, toxins, or other hazardous materials to enter the firefighter’s breathing space, which defeats the purpose of using SCBA.

The appropriate procedure is to wear the hood over the SCBA facepiece, thereby ensuring both proper sealing and protective coverage. Firefighters are trained to prioritize effective sealing and airflow, making it imperative that the equipment functions as designed to ensure their safety in hazardous environments. Therefore, wearing the hood under the SCBA facepiece is not appropriate and can pose a risk during firefighting operations.