When a tailwind component exists, what should be stated?

When a tailwind component exists, it is crucial to state the wind direction and velocity. This information is essential because the presence of a tailwind can significantly affect an aircraft's takeoff and landing performance. A tailwind increases the ground speed of the aircraft during its takeoff roll, increasing the required distance for takeoff and potentially impacting the aircraft's ability to become airborne safely, especially on shorter runways or when the aircraft is heavily loaded.

Providing detailed information about the wind direction helps pilots understand how the wind will affect their takeoff and approach paths. Additionally, knowing the wind velocity allows for proper calculations regarding performance limits and safety margins, as pilots may need to adjust their procedures based on the strength of the tailwind.

While runway conditions, aircraft type, takeoff weight, fuel load, visibility, and traffic patterns are all important factors in flight operations, they do not provide the specific, immediate implications on performance that wind direction and velocity do when dealing with a tailwind component. Understanding and communicating wind conditions are vital for ensuring safe flight operations in an air traffic control environment.