In airports with weather sensors on the approach ends of two or more runways, when the equipment is operational and reliable, which end's data is used?

• A. Active end
• B. Inactive end
• C. Both ends
• D. Neither end

Answer: (A)

When two runway ends have weather sensors, the observations that are published and used operationally come from the end currently being used for approaches—the active end. This ensures wind, visibility, ceiling, and other conditions reflect what pilots will actually encounter on the approach to that runway. The data from the opposite end (inactive end) is reserved as a backup and not used in routine reports, so it won’t create confusion or misrepresent the weather for the in-use approach. If the active end is working reliably, its data is the one disseminated as the official observation.