Why are center of gravity limits important in air loading?

• A. They affect aircraft stability and controllability.
• B. They affect aerodynamics only on the ground.
• C. They determine the color of the paint.
• D. They only matter for long-distance flights.

Answer: (B)

Center of gravity placement defines how the airplane will respond to control inputs and disturbances in flight. The CG location sets the moment arm of wing lift about the aircraft, which directly influences longitudinal stability and the amount of elevator authority available to trim, rotate, and recover from unusual attitudes. If the CG is too far forward, the aircraft becomes more stable but harder to pitch up and rotate, requiring more elevator force and reducing climb performance and stall characteristics. If the CG is too far aft, stability decreases and control can become erratic or unsafe, with reduced stall margins and potential for loss of pitch control. Keeping CG within prescribed limits ensures the airplane remains controllable and predictable throughout the flight, including when air loading shifts due to fuel burn, movement of passengers or cargo, or changes in loading. It’s about maintaining stability and controllability across the flight envelope, not about ground aerodynamics, color, or distance alone.