Wind shear presents the greatest risk during which flight phases?

• A. Takeoff and landing
• B. Cruise
• C. Descent
• D. Ground operations

Answer: (A)

Wind shear is a rapid change in wind speed or direction with height. This is most dangerous during takeoff and landing because the airplane is operating close to the ground with a narrow margin above stall and required climb performance. A sudden shift in wind—such as a gust, a shift from headwind to tailwind, or a downdraft from a microburst or gust front—can cause a quick loss or change in indicated airspeed. That leaves little time to react while near the runway, making control and safe recovery much more challenging than in cruise or descent. In cruise, the aircraft is at higher altitude with more energy and room to maneuver, and in descent there is generally more margin before reaching the ground, so the immediate, high-stakes risk at low altitude is not as pronounced as during takeoff and landing. Ground operations can experience gusts, but the critical dynamics of maintaining proper airspeed and climb or descent path are most acute during the takeoff and approach phases.