What happens to the controllability of an aircraft loaded with the CG aft of the aft limit?

• A. Stability improves
• B. In no change in controllability
• C. It becomes easier to recover from stall and spin
• D. Stall and spin recovery may be difficult or impossible

Answer: (D)

When an aircraft's center of gravity (CG) is loaded aft of the aft limit, the stability of the aircraft is compromised, leading to significant challenges in controllability. An aft CG location typically results in decreased stability in pitch. This can manifest as a reduction in the effectiveness of control surfaces, making it more challenging for the pilot to achieve and maintain desired attitudes and angles of attack.

One critical aspect of this is that the aircraft may become more prone to stall characteristics that are less predictable. If an aircraft stalls with an aft CG, it may not recover as easily, and the chances of entering a spin—where the aircraft rotates uncontrollably about its vertical axis—are increased. Recovery from a spin under these conditions is particularly concerning, as the aerodynamic responses are altered, making it possible for recovery actions to be ineffective or delayed.

This is why the correct answer highlights that stall and spin recovery may become difficult or impossible. Understanding the implications of CG positioning is crucial for pilots, as it directly affects aircraft performance, safety, and handling characteristics.