ΔCG indicates a change in what aviation parameter?

• A. Change in temperature
• B. Change in air pressure
• C. Change in center of gravity
• D. Change in engine power

Answer: (C)

ΔCG means a change in the center of gravity—the balance point along the airplane’s longitudinal axis. The center of gravity is determined by how weight is distributed from nose to tail, and it directly affects stability and controllability. When weight is added, removed, or moved (for example, passengers shifting, cargo shifting, or fuel being burned from tanks), the CG shifts forward or aft. The delta symbol indicates that you’re looking at a change in that balance point, which is crucial for performance calculations and safe handling. This is different from changes in temperature, air pressure, or engine power, which affect air density, thrust, or aerodynamic forces but not the location of the balance point. So, ΔCG points to a change in the center of gravity.