Which of the following is NOT part of the actions taken in a Threat Level 3 scenario?

Taking comfortable measures to relax passengers is not an action associated with a Threat Level 3 scenario. In this context, a Threat Level 3 indicates a credible security threat that may potentially harm the aircraft, passengers, or crew. The emphasis during such a scenario is on maintaining safety and security rather than comfort.

Actions such as notifying the pilot-in-command (PIC) are essential for ensuring that the flight crew is aware of the situation and can take necessary precautions or actions to safeguard everyone on board. Following flight deck lockdown procedures is crucial to prevent unauthorized access and to secure the cockpit, which is a high priority during a significant threat. Additionally, requesting assistance from other crew members is vital to coordinate efforts and enhance security measures, ensuring a collective response to the threat.

In a scenario focused on managing safety and mitigating risks, creating a comfortable atmosphere for passengers is not appropriate, as the need to remain vigilant and prepared for potential emergencies takes precedence.