In what scenario would you issue a runway change during an arrival/departure flow?

• A. To save fuel at the pilot's discretion.
• B. Only when pilot requests it.
• C. Never; runways must not be changed mid-flow.
• D. When safety, efficiency, or weather dictates a different runway is preferable.

Answer: (D)

The situation is about using runways in response to changing conditions to keep operations safe and smooth. You would issue a runway change during an arrival or departure flow when the current runway no longer offers the best balance of safety and efficiency given the present wind, weather, visibility, or traffic situation. If winds shift, storms move in, or another runway provides better braking action, clearer air for arrivals, or less conflict with other traffic, switching to that runway helps maintain safe separation and efficient sequencing. Pilots may request a change, but the decision to authorize it rests with ATC based on what would keep the flow safest and most efficient. It isn’t about saving fuel or about never changing; it’s about choosing the runway that best fits the current conditions.