Unless the specific weight for an item is known, The standard weights used in aircraft weight and balance are as follows: Example Weighing of an Airplane Figure 1 – a tricycle gear airplane is being weighed by using three-floor scales. The specifications on the airplane and the weighing specific data are as follows: The following necessary information is calculated by analyzing the data, found for the airplane being weighed in Figure 2. Also, read – AIRPLANES: PARTS AND THEIR FUNCTIONS Based on the calculation shown in the chart, the center of gravity is at +50.1″, which means it is 50.1″ aft of the datum. This places the center of gravity forward of the main landing gear, which must be the case for a tricycle gear airplane. This number is the result of dividing the total moment of 66,698 in-lb by the total weight of 1,331.5 lb. See more: