Private Pilot License (PPL) Aerodynamics Practice Exam

Loading an airplane to the most aft center of gravity (CG) will result in:

1. Increased stability at all speeds

2. Decreased stability at higher speeds

3. Less stability at all speeds

4. Improved maneuverability

The correct answer is: Less stability at all speeds

Loading an airplane to the most aft center of gravity (CG) results in less stability at all speeds. When the CG is positioned towards the rear of the aircraft, it affects the balance and control characteristics significantly. An aft CG shifts the center of lift closer to the center of gravity, which can lead to a condition known as "neutral or negative stability." In neutral stability, the aircraft will not automatically return to its original flight position after being disturbed, such as during turbulence or a control input. This condition means that any pitch changes are likely to be exaggerated, making the aircraft more difficult to handle. The pilot may find that control inputs have a more pronounced effect, leading to potentially erratic behavior in flight. This reduced stability is noticeable across all speeds, as an aft CG creates challenges in maintaining level flight. In contrast, a more forward CG generally promotes stability because it ensures that disturbances (like changes in pitch) are countered more effectively by the aircraft's aerodynamic design. Therefore, recognizing the implications of CG position is crucial for safe flight operations and proper aircraft handling.