A stall is most likely to occur when?

• A. Nose gear malfunction
• B. Excessive bank angle with adequate lift
• C. Too much tailwind
• D. Wing lift is insufficient to support weight; can lead to loss of control

Answer: (D)

A stall happens when the wing can’t produce enough lift to balance the airplane’s weight. In level flight, lift must equal weight; when lift drops below what's needed—usually because the angle of attack is too high or the airspeed is too low—the wing flow separates and lift collapses. That’s exactly what the option describing lift being insufficient to support weight conveys, and it directly captures why a stall occurs and leads to loss of control if not corrected. The other ideas don’t describe the primary cause: gear issues don’t change lift, tailwinds don’t create a stall, and a banked turn raises stall speed but won’t cause a stall unless the lift is not enough for the increased weight, so the fundamental condition is insufficient lift.