How is the location of the center of gravity (C.G.) commonly represented?

The center of gravity (C.G.) location is commonly represented in two ways: as a specific distance in inches from a reference point known as the datum, or as a percentage of the Mean Aerodynamic Chord (MAC) of the aircraft.

Using inches from the datum provides a precise measurement that indicates how far the C.G. is from a predefined reference point on the aircraft. By employing MAC percentage, it allows for a standardized comparison among different aircraft, as different aircraft types have varying chord lengths.

This dual representation helps in ensuring that the aircraft is balanced properly for safe operation during all phases of flight. Proper C.G. positioning is crucial for flight stability and controllability. The other options do not accurately reflect the industry standards for representing C.G. locations. For instance, while fuel weight percentage might influence the C.G. position due to the fuel's location, it does not directly represent the C.G. itself. Fixed measurements in pounds do not convey the position of the C.G. within the aircraft, and time of flight measures are unrelated to the concept of gravitational center.