Unless the particular weight for things is known, the standard weights provided in aircraft weight and also balance are together follows:Aviation gasoline 6 lb/galTurbine fuel 6.7 lb/galLubricating oil 7.5 lb/galWater 8.35 lb/galCrew and also passengers 170 lb every person
Example Weighing of one Airplane
In figure 4-20, a tricycle gear aircraft is being weighed by using three floor scales. The specifications on the plane and the weighing particular data room as follows:Aircraft Datum: top edge that the wingLeveling Means: two screws, left side of fuselage below windowWheelbase: 100″Fuel Capacity: 30 festival 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 on left main 5 lb chocks on best main 2.5 lb chock on noseDuring Weighing: Fuel tanks full and also oil full Hydrometer examine on fuel mirrors 5.9 lb/galFigure 4-20. Example aircraft being weighed.
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By analyzing the data identified for the aircraft being weighed in figure 4-20, the following needed information is determined.Because the airplane was weighed v the fuel tanks full, the complete weight of the fuel should be subtracted and also the unusable fuel added back in. The weight of the fuel being subtracted is based on the pounds every gallon determined by the hydrometer examine (5.9 lb/gal).Because wheel chocks are provided to store the airplane from rolling off the scales, your weight must it is in subtracted from the range readings as 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 calculate the airplane’s empty weight and empty weight facility of gravity, a six obelisk chart is used. Figure 4-21 mirrors the calculation because that the airplane in Figure 4-20.Figure 4-21. Center of heaviness calculation for plane being weighed.
Based ~ above the calculation shown in the chart, the center of gravity is in ~ +50.1″, which means it is 50.1″ aft of the datum. This locations the facility of heaviness forward of the main landing gear, which should be the situation for a tricycle gear airplane. This number is the result of dividing the complete moment that 66,698 in-lb through the total weight of 1,331.5 lb.
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