What is an airplane's center of gravity?

The center of gravity (CG) of an airplane refers to the specific point where the total weight of the aircraft is evenly distributed in all directions. This point is crucial for ensuring that the aircraft maintains stable flight characteristics and control. When the CG is properly balanced, it contributes to the aircraft’s overall stability and maneuverability during flight.

For example, if the center of gravity is too far forward or aft, it can lead to issues such as nose-diving or stalling, making it difficult for the pilot to control the aircraft. Therefore, understanding where this point lies and how it can change with different loads (like passengers or cargo) is fundamental for safe aircraft operation.

Conversely, the other options refer to different concepts within aviation. The first choice incorrectly suggests that the CG is about uneven weight distribution, which would actually lead to instability. The third choice regarding weight limits for passengers does not pertain to the definition of center of gravity. The last option, mentioning the engine's location, is also unrelated to what the center of gravity specifically indicates about aircraft weight distribution. Understanding the correct definition of the center of gravity is essential for pilots to ensure proper loading and balance of the aircraft.