Which condition may not be ideal for an aircraft's stability at critical airspeeds?

An aircraft's stability is significantly influenced by its center of gravity (CG) position. When an aircraft is loaded such that its center of gravity is near the aft limit, it can lead to a decrease in pitch stability. This is particularly critical during phases of flight where maintaining controlled attitudes is essential, such as critical airspeeds during takeoff or landing.

In these scenarios, an aft center of gravity can cause the aircraft to be more prone to pitch oscillations and can make it more difficult to recover from disturbances. This may manifest as difficulty maintaining climbs or controlled descents, as the aircraft may be more sensitive to control inputs. Overall, having the CG at the aft limit may not provide the necessary stability that is crucial for safe and effective aircraft operation at those critical airspeeds, making it less than ideal for stability.

In contrast, a forward CG position generally results in improved stability and control, and straightforward flight scenarios like level or descending flight would inherently not compromise the stability in the same manner as the aft limit would.