Unless the details weight for an object is known, the standard weights used in plane weight and balance are together follows:

Aviation petrol 6 lb/galTurbine fuel 6.7 lb/galLubricating oil 7.5 lb/galWater 8.35 lb/galCrew and also 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 plane and the weighing particular data room as follows:

Aircraft Datum: leading edge the the wingLeveling Means: 2 screws, left side of fuselage below windowWheelbase: 100″Fuel Capacity: 30 festival aviation gasoline at +95″Unusable Fuel: 6 lb at +98″Oil Capacity: 8 qt at –38″Note 1: Empty weight includes unusable fuel and also full oilLeft key Scale Reading: 650 lbRight key Scale Reading: 640 lbNose range Reading: 225 lbTare Weight: 5 lb chocks top top left main 5 lb chocks on appropriate main 2.5 lb chock ~ above noseDuring Weighing: Fuel tanks full and oil full Hydrometer inspect on fuel mirrors 5.9 lb/galFigure 4-20. Example aircraft being weighed.You are watching: Weight of aviation oil per quart

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

Because the airplane was weighed through the fuel tanks full, the full weight the the fuel should be subtracted and the unusable fuel included back in. The weight of the fuel being subtracted is based on the pounds per gallon determined by the hydrometer inspect (5.9 lb/gal).Because wheel chocks are used to save the airplane from rolling turn off the scales, their weight must it is in subtracted indigenous the range readings together tare weight.Because the key 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 to the main wheel centerline (70″). Therefore, the arm for the nosewheel is −30″.To calculation the airplane’s north weight and also empty weight facility of gravity, a six tower chart is used. Figure 4-21 shows the calculation because that the aircraft in Figure 4-20.

Figure 4-21. Facility of gravity calculation for aircraft being weighed.Based on the calculation presented in the chart, the center of heaviness is at +50.1″, which method it is 50.1″ aft of the datum. This places the facility of gravity forward of the key landing gear, which must be the situation for a tricycle equipment airplane. This number is the result of dividing the total moment the 66,698 in-lb through the total weight the 1,331.5 lb.

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