Which wind direction provides the most favorable approach for landing on runway 21?

To determine the most favorable wind direction for landing on runway 21, it's essential to recognize that runway numbers are based on their magnetic heading rounded to the nearest 10 degrees. Runway 21, therefore, has a magnetic heading of approximately 210 degrees.

When landing, pilots prefer to land into the wind because it provides better control and reduces landing distance. A headwind increases lift and control effectiveness, leading to a safer landing environment.

The wind direction providing the most favorable landing conditions would be one that is closest to directly opposing the heading of runway 21. In this case, a wind direction of 180 degrees is directly opposite to the runway's heading of 210 degrees. This means that a wind from 180 degrees would provide a headwind component for the landing, which is highly desirable.

Winds from other directions, such as 360 degrees (north), 010 degrees (slightly to the northeast), and 140 degrees (south-southeast), would not be as favorable, as they would either provide a crosswind component or a tailwind, both of which can complicate the landing process. Therefore, the wind direction from 180 degrees is indeed the most advantageous for landing on runway 21.