Select a primary factor that leads to a low flare landing error.

Rounding out too high during the flare is a primary factor that leads to a low flare landing error. When a pilot begins to round out at a height that is too elevated, they may inadvertently delay the moment they allow the aircraft to touch down. This can result in descending too rapidly when finally leveling off, which may lead to a less controlled landing. A proper flare involves reducing the descent rate while maintaining the appropriate height above the runway until the moment of touchdown, allowing for a smoother landing. By rounding out too high, pilots may not have the adequate time or altitude to effectively manage the flare, resulting in the aircraft arriving at the runway at an unsafe vertical speed or at a low attitude.

The other factors mentioned also contribute to landing errors but do not specifically lead to a low flare situation in the same direct manner. For example, a steep approach might lead to difficulty in adjusting the descent rate but doesn't inherently cause a landing low; insufficient speed upon touchdown can complicate the landing, but again, does not directly create a low flare scenario. Finally, improper power management might affect overall descent and glide path but doesn't uniquely lead to a low flare landing error.