Certified Flight Instructor - Flight Instructor Airplane Practice Exam

During flight, what consequence arises from an excessively rearward CG?

1. Improved climb performance.

2. Increased maneuverability.

3. Reduced stall margins.

4. Enhanced straight flight stability.

The correct answer is: Reduced stall margins.

An excessively rearward center of gravity (CG) can significantly impact the aircraft's performance and handling characteristics. When the CG shifts rearward beyond the manufacturer's specified limits, the balance of the aircraft changes, which can lead to a reduction in stall margins. Stall margin refers to the difference between the stall speed of the aircraft and the speed at which it is flying. When the CG is too far back, the aircraft can become less stable and more prone to stalling, because the control surfaces may not be effective enough to maintain adequate airflow over them when the aircraft approaches its critical angle of attack. This means that the aircraft might stall at a higher speed or be more susceptible to an accelerated stall, especially during maneuvers or in conditions requiring quick adjustments. Acknowledging the effects of a rearward CG is crucial for pilots because it can lead to critical safety issues if not properly managed. This contrasts with the options related to improved performance, increased maneuverability, or enhanced stability, which could misleadingly suggest benefits that do not materialize with an improper CG configuration.