If the aircraft does not change in gross weight but the cargo is shifted, what aspect is affected?

When cargo is shifted within an aircraft while the gross weight remains constant, the center of gravity (CGA) of the aircraft is what is primarily affected. The center of gravity is a critical factor in determining the aircraft's balance and stability. Shifting cargo means that the distribution of weight changes, which can shift the CGA forward, rearward, or laterally depending on where the cargo is moved.

This change in the positioning of the CGA doesn't alter the total weight or total moments produced, but it can significantly influence how the aircraft handles in flight. The overall stability of the aircraft is also tied to the position of the CGA relative to the center of lift; thus, any change in the CGA can affect the stability characteristics of the aircraft. In summary, shifting cargo affects the aircraft's balance by altering the position of the center of gravity, making it an essential consideration for safe flight operations.