Which of the following is NOT one of the four essential aircrew coordination principles?

Promoting individual autonomy is not one of the four essential aircrew coordination principles. The focus of aircrew coordination is on teamwork and communication among crew members to ensure safe and efficient operations. While individual skills and decision-making are important, aircrew coordination emphasizes collaboration and support among team members to achieve common goals.

The other principles highlight the necessity for effective communication, maintaining a climate where crew members are ready to assist each other, and ensuring that the aircraft is under situational control at all times. These principles underscore the idea that safety and operational effectiveness depend on team dynamics rather than individual autonomy, indicating that the best outcomes are achieved through coordinated efforts rather than isolated actions.