If you observe an aircraft in unsafe proximity to an obstruction, what must you do?

When you observe an aircraft in unsafe proximity to an obstruction, it is imperative to inform the appropriate controller. This action is essential because the controller can assess the situation, determine the best course of action, and communicate important information to the pilot. This may include instructing the aircraft to change altitude, change course, or take other necessary measures to ensure safety.

Notifying the controller enables a coordinated response to mitigate any potential risk of collision with the obstruction. In air traffic control operations, clear communication is crucial, and informing the controller contributes to maintaining safety for all aircraft in the vicinity.

This approach relies on the principle of collaboration among controllers and pilots to ensure that all parties are aware of potential hazards and can react appropriately. Cooperation within the air traffic management system is vital for avoiding unsafe situations.