Which items serve as wind direction indicators?

• A. Altimeter.
• B. Anemometer and barometer.
• C. VOR, ADF, and DME.
• D. Wind direction indicators include a wind sock, wind tee, or tetrahedron.

Answer: (D)

Wind direction indicators are simple visual tools on the airfield that show which way the wind is moving across the runway, helping pilots decide which runway to use and how to configure their approach and landing. The wind sock, wind tee, and tetrahedron are designed for quick, at-a-glance interpretation from the cockpit, with the indicator’s orientation giving the wind direction and its movement or fullness giving a sense of wind strength and gusts. The other items measure or provide information unrelated to wind direction: the altimeter shows altitude, the barometer measures air pressure, the anemometer measures wind speed, and VOR, ADF, and DME are navigation aids used for determining position and guidance. So the items that serve as wind direction indicators are the wind sock, wind tee, and tetrahedron.