Before issuing control instructions that will change an aircraft's heading, route, speed, or altitude, what should be ensured?

Ensuring that coordination with affected controllers has been accomplished before issuing control instructions that change an aircraft's heading, route, speed, or altitude is critical for maintaining air traffic safety and efficiency. This process involves confirming that other controllers who oversee adjacent airspace or who might be affected by the change are aware of and agree to the new instructions. It promotes clear communication and avoids potential conflicts that could arise from uncoordinated changes in flight paths or altitude.

Effective coordination helps create a seamless flow of air traffic and prevents situations where aircraft might inadvertently violate airspace boundaries or experience conflicting instructions. Since multiple controllers manage different segments of airspace, collaborating and sharing information ensures that all necessary parties are aligned, ultimately enhancing overall air traffic management.