FAA Airframe Weight and Balance Practice Test

When making structural modifications that affect weight, it is essential to recalculate the empty weight center of gravity (CG). This is because any change in the structure, whether it involves adding or removing components, can significantly alter the distribution of weight within the aircraft.

The empty weight CG refers to the center of gravity of the aircraft when it is in its empty state, which includes only the airframe, installed engines, unusable fuel, and other items that are fixed in the aircraft. Adjustments to this weight distribution can impact the aircraft's flight characteristics and stability, necessitating a precise recalculation to ensure that the CG remains within the certified limits.

Accurate calculations allow for safe operation of the aircraft by ensuring it continues to meet design and performance criteria, and assists in maintaining control during various phases of flight.