Answer :
Final answer:
a) Runway with heading north
With a wind from the north at 20 knots and a 13-knot crosswind component limit, acceptable runways for use are those heading north or south, to minimize crosswind and align with the wind.
Explanation:
The subject of this question is aerodynamics, specifically pertaining to the operation of an aircraft relative to wind conditions. When choosing a runway for an aircraft's take-off or landing, it is crucial to consider the wind direction and speed to minimize crosswind components, which can affect aircraft control. With a reported wind from the north at 20 knots and an aircraft's maximum allowable crosswind component of 13 knots, the acceptable runways for use would be those with headings north (Runway with heading north) or south (Runway with heading south), as these would provide a headwind or tailwind. Using a runway with a heading east or west would result in a direct crosswind, which at 20 knots exceeds the 13-knot crosswind component limit.
