What can cause movement of centre of gravity in an aircraft?

The movement of the center of gravity (CG) in an aircraft can be influenced by various factors, and the correct choice reflects this complexity.

Fuel burn is a significant factor since as fuel is consumed during flight, the distribution of weight changes. Depending on the configuration of the fuel tanks, the CG can shift forward or aft, potentially affecting the aircraft's stability and handling characteristics.

Passenger movement also impacts the CG. When passengers shift positions within the cabin, it alters the weight distribution. This can happen when passengers move from one seat to another or if cargo is reloaded during a stop. Such movements can lead to changes in the aerodynamics of the aircraft and require adjustments in flight management.

High speeds can indirectly affect the aerodynamics and control of an aircraft, but they do not directly shift the CG. However, it is important to mention that at high speeds, the aircraft may experience different handling characteristics based on the current CG position, further necessitating careful monitoring during flight operations.

Thus, the combined impact of fuel burn, passenger movement, and the effects associated with high speeds lead to a comprehensive understanding of what can cause the center of gravity to move in an aircraft.