A stall is most likely to occur when?

• A. When engine failure occurs
• B. When airspeed is too high
• C. When turning at low altitude
• D. When wing lift is insufficient to support weight; can lead to loss of control

Answer: (D)

A stall happens when the wing can’t generate enough lift to support the aircraft’s weight. Lift depends on airspeed, wing area, air density, and how far the wing is angled relative to the oncoming air (angle of attack). If the aircraft’s weight requires more lift than the wing can provide—due to being too slow for the current configuration, or being in a high-load maneuver like a steep turn—the wing’s flow can separate and lift drops off abruptly. That loss of lift can lead to loss of control, which is the key danger of a stall.

The other scenarios aren’t the core cause: engine failure can reduce performance but isn’t the direct definition of a stall; airspeed that’s too high won’t induce a stall (stalls occur near or below the stall speed); and turning at low altitude is a risky situation that can cause a stall, but it’s the insufficient lift relative to weight that’s the fundamental mechanism behind a stall.