Private Pilot Private Practice Exam

The longitudinal stability of an airplane primarily depends on the location of the center of gravity (CG). This stability is influenced by how the aircraft's weight is distributed. If the CG is located forward of the center of lift, the airplane will tend to return to a straight and level flight after a disturbance, which indicates positive longitudinal stability. Conversely, if the CG is too far aft, the airplane may become unstable and difficult to control, as it would require constant adjustments from the pilot to maintain steady flight.

While other factors, such as wing configuration and aircraft speed, can impact the handling characteristics of an aircraft, these elements do not fundamentally determine longitudinal stability. Similarly, the type of engine may affect performance but does not play a direct role in influencing the stability characteristics related to the CG's position. Therefore, the correct answer highlights the critical role the center of gravity plays in ensuring that an aircraft can maintain steady, controlled flight through its design and weight distribution.