What effects can wind shear or microbursts have on takeoff and initial climb performance?

• A. Sudden changes in wind speed/direction can cause loss of airspeed and control during takeoff and climb; require immediate corrective action
• B. They always improve takeoff performance
• C. They affect only cruise at high altitude
• D. They have no effect on takeoff

Answer: (A)

Wind shear and microbursts create abrupt changes in wind speed or direction with height, which disrupts the airflow over the wing just when you need steady lift during takeoff and the initial climb. Because you’re near the stall margin and depend on a predictable indicated airspeed to maintain a safe angle of attack, any sudden drop in headwind (or a rapid gust) can cause a rapid loss of airspeed and, if not corrected, a loss of lift and control. A microburst adds a strong downdraft and gust front, producing a sharp, near-ground disruption that can drastically reduce climb performance at the moment you’re most vulnerable.

Therefore, the correct approach is to recognize the sudden wind change and immediately take action to restore a safe airspeed and climb gradient—usually by applying full power when appropriate and adjusting pitch to maintain or quickly recover airspeed, then continuing the climb once out of the shear layer.

These events do not improve takeoff conditions, and they are not limited to cruise at high altitude; they directly threaten takeoff and initial climb, and they do have real effects on takeoff performance.