When wind is channeled through areas, such as a narrow valley or between tall structures, the remote PIC should expect:

When wind is channeled through areas, such as a narrow valley or between tall structures, the remote PIC should expect:

• A. Wind direction change only without turbulence
• B. A decrease in wind speed
• C. Unchanged wind speed
• D. An increase in wind speed and turbulent flow

Answer: (D)

When wind is funneled through a narrow space, the air is squeezed into a smaller cross-section, so it speeds up. At the same time, obstacles and the surrounding surfaces disrupt the flow, creating shear and eddies that lead to turbulent air. So the remote PIC should expect both higher wind speeds and turbulent flow, including gusts and sudden changes in direction or intensity that can affect stability and control. This isn’t just a directional change; there will be acceleration and noticeable turbulence. The other options—decreased wind speed, unchanged wind speed, or wind direction change only—don’t fit because channeling inherently speeds up the flow and generates turbulence. Plan for gusty conditions and adjust flight to maintain control and safety.

When wind is funneled through a narrow space, the air is squeezed into a smaller cross-section, so it speeds up. At the same time, obstacles and the surrounding surfaces disrupt the flow, creating shear and eddies that lead to turbulent air. So the remote PIC should expect both higher wind speeds and turbulent flow, including gusts and sudden changes in direction or intensity that can affect stability and control.

This isn’t just a directional change; there will be acceleration and noticeable turbulence. The other options—decreased wind speed, unchanged wind speed, or wind direction change only—don’t fit because channeling inherently speeds up the flow and generates turbulence. Plan for gusty conditions and adjust flight to maintain control and safety.