Unless the specific weight for an object is known, the standard weights supplied in aircraft weight and also balance are as follows:

Aviation gasoline 6 lb/galTurbine fuel 6.7 lb/galLubricating oil 7.5 lb/galWater 8.35 lb/galCrew and passengers 170 lb per person

Example Weighing of an Airplane

In figure 4-20, a tricycle gear airplane is being weighed by using 3 floor scales. The specifications on the aircraft and the weighing details data are as follows:

Aircraft Datum: leading edge the the wingLeveling Means: two screws, left side of fuselage below windowWheelbase: 100″Fuel Capacity: 30 gal aviation gasoline at +95″Unusable Fuel: 6 lb in ~ +98″Oil Capacity: 8 qt at –38″Note 1: Empty load includes unusable fuel and also full oilLeft key Scale Reading: 650 lbRight main Scale Reading: 640 lbNose scale Reading: 225 lbTare Weight: 5 lb chocks ~ above left main 5 lb chocks on best main 2.5 lb chock ~ above noseDuring Weighing: Fuel tanks full and oil full Hydrometer inspect on fuel reflects 5.9 lb/galFigure 4-20. Example plane being weighed.

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By evaluating the data identified for the aircraft being weighed in number 4-20, the complying with needed information is determined.

Because the airplane was weighed v the fuel tanks full, the full weight the the fuel need to be subtracted and the unusable fuel added back in. The weight of the fuel being subtracted is based on the pounds every gallon established by the hydrometer inspect (5.9 lb/gal).Because wheel chocks are used to save the airplane native rolling turn off the scales, your weight must be subtracted native the scale readings as tare weight.Because the main wheel centerline is 70″ behind the datum, its arm is a +70″.The eight for the nosewheel is the difference between the wheelbase (100″) and the distance from the datum come the key wheel centerline (70″). Therefore, the eight for the nosewheel is −30″.

To calculate the airplane’s north weight and empty weight facility of gravity, a six tower chart is used. Figure 4-21 mirrors the calculation because that the plane in Figure 4-20.

Figure 4-21. Facility of gravity calculation for airplane being weighed.

Based top top the calculation shown in the chart, the center of gravity is in ~ +50.1″, which method it is 50.1″ aft of the datum. This locations the center of gravity forward of the key landing gear, which must be the case for a tricycle equipment airplane. This number is the result of dividing the complete moment that 66,698 in-lb by the total weight the 1,331.5 lb.

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