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You are here: Home / Basic Aviation Maintenance / Aircraft Weight and Balance / Weight and Balance Terminology – Center of Gravity

Weight and Balance Terminology – Center of Gravity

Filed Under: Aircraft Weight and Balance

The center of gravity (CG) of an aircraft is a point about which the nose heavy and tail heavy moments are exactly equal in magnitude. It is the balance point for the aircraft. An aircraft suspended from this point would have no tendency to rotate in either a nose-up or nose-down attitude. It is the point about which the weight of an airplane or any object is concentrated.

Figure 4-3. Center of gravity and a first class lever.
Figure 4-3. Center of gravity and a first class lever.

Figure 4-3 shows a first class lever with the pivot point (fulcrum) located at the center of gravity for the lever. Even though the weights on either side of the fulcrum are not equal, and the distances from each weight to the fulcrum are not equal, the product of the weights and arms (moments) are equal, and that is what produces a balanced condition.

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