Answer :
Final answer:
The winds of 180 at 25 knots favour Runway 21 due to the direct alignment with minimal crosswind, making the correct answer Runway 21, 5 knots. So the correct answer is option (D).
Explanation:
Given winds of 180 at 25 knots and an airport with runway 03/21, we first need to determine which runway the winds favour and then calculate the crosswind component. Runway numbers correspond to their direction relative to magnetic north, multiplied by 10. Therefore, runway 03 is oriented towards 30° (northeast) and runway 21 is oriented towards 210° .
A wind coming from 180° is directly aligned with the approach to runway 21, meaning the wind is blowing from the south towards the north. To determine the crosswind component, we calculate the difference in angles between the runway alignment and the wind direction. The difference for runway 21 is minimal, indicating a nearly direct headwind with negligible crosswind.
