When should the caution strap be placed across a door opening on the ERJ 175?

The caution strap should be placed across a door opening on the ERJ 175 when the door is open and unattended. This practice is important for enhancing safety by preventing accidental entry into the open door area, which could pose a risk to both passengers and crew. The caution strap serves as a visual and physical barrier, indicating that the door is not secure and should not be accessed without the presence of personnel.

In the context of operational safety procedures, placing the strap also helps in maintaining awareness of the open door situation, ensuring that all crew members are aware of potential hazards while attending to other duties. This precautionary measure is vital when the door is not supervised, as it minimizes the risk of unauthorized access or accidents.