Final answer:
A pilot can expect a wind-shear zone in a temperature inversion whenever the windspeed at 2,000 to 4,000 feet above the surface is at least 15 knots.
Step-by-step explanation:
A pilot can expect a wind-shear zone in a temperature inversion whenever the windspeed at 2,000 to 4,000 feet above the surface is at least 15 knots. Wind shear refers to a sudden change in wind speed or direction over a short distance, which can be dangerous for pilots. Temperature inversion occurs when temperature increases with altitude, creating stable air conditions that can enhance wind shear. So, when the windspeed at the specified altitude range reaches or exceeds 15 knots, a pilot should be cautious of potential wind shear.