Which action marks the boundaries when establishing the cordon?

• A. Place warning tape around the perimeter.
• B. Mark around the aircraft.
• C. Set a line using chalk along the ground only.
• D. Use cones to define boundaries without marking.

Answer: (B)

The boundary is defined by marking around the aircraft. This creates a precise cordon that follows the aircraft’s footprint and immediate hazards, so everyone knows exactly what area is restricted and where firefighting and rescue operations can safely take place. It helps contain fuel spills, hot zones, and debris while giving incident command a clear reference point for the hot, warm, and cold zones. Other methods like generic perimeter tape, chalk lines, or cones alone don’t tie the boundary to the aircraft itself and can be less durable or accurate in the fast-changing conditions of an incident.