Commercial Pilot Airplane (CAX) Performance Practice Exam – Practice Test & Study Guide

To determine the crosswind component when the surface wind is at 180 degrees (i.e., directly from the south) and blowing at 27 knots, one needs to consider the angle of the wind relative to the runway orientation.

The crosswind component can be calculated using the formula:

Crosswind Component = Wind Speed × sin(Angle)

In this scenario, if we assume the runway is oriented at 90 degrees (east-west), the wind blowing directly from the south (180 degrees) creates a 90-degree angle relative to that runway. Therefore, the sine of 90 degrees is 1.

Using the formula:

Crosswind Component = 27 knots × sin(90 degrees)

Crosswind Component = 27 knots × 1

Crosswind Component = 27 knots

However, without knowing the exact runway orientation, if we consider a typical situation where the runway is oriented east-west, the value given may need adjustment for how crosswind is typically calculated when considering actual flight operations and runway alignment.

The context for determining the crosswind usually factors in the orientation that would result in maximum crosswind adjustment, showing that the higher choices are indeed more realistic estimates of operational situations. Since C states 21 knots, this indicates an estimation