What is the allowable movement of an aircraft's centre of gravity?

The allowable movement of an aircraft's centre of gravity (CG) is indeed that it can be allowed to move between defined limits. This movement is crucial for flight safety and performance. The CG location affects various flight characteristics, including stability, control, and overall aircraft handling.

Every aircraft is designed with specific CG limits, which are indicated in the flight manual. These limits account for the different loading configurations, such as fuel, passengers, cargo, and equipment. When the CG remains within these defined limits, the aircraft can maintain stable flight, efficient performance, and control authority.

If the CG were to move beyond specified limits, it could lead to undesirable flight dynamics, making the aircraft difficult to control or respond poorly to pilot inputs. Therefore, understanding and managing the movement of the CG relative to the defined limits is a critical responsibility for pilots and operators during aircraft loading and flight planning.