What is a loading envelope?

• A. The maximum takeoff weight limit only.
• B. The maximum and minimum fuel capacity.
• C. The flight envelope in terms of speed and altitude.
• D. The enclosed area on a graph of an airplane's loaded weight and CG location. If lines drawn from the weight and CG cross within this envelope the airplane is properly loaded.

Answer: (D)

A loading envelope is the safe range of combinations of airplane loaded weight and center of gravity. On a weight-and-balance diagram, the envelope is the enclosed area bounded by the forward and aft CG limits at different weights (and typically by the maximum gross weight). If the actual loaded weight and CG location fall inside this region, the aircraft is within the permitted loading limits, ensuring adequate stability, controllability, and structural margins. If the load point lies outside, handling or structural concerns could arise. This concept is distinct from the flight envelope (speed and altitude limits) or from simply knowing the maximum fuel capacity or maximum takeoff weight.