Unless the particular weight for an object is known, the standard weights offered in plane weight and also 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 every person
Example Weighing of an Airplane
In figure 4-20, a tricycle gear airplane is being weighed through using 3 floor scales. The specifications on the airplane and the weighing specific data are as follows:Aircraft Datum: top 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 in ~ –38″Note 1: Empty weight includes unusable fuel and also full oilLeft key Scale Reading: 650 lbRight main 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 check on fuel shows 5.9 lb/galFigure 4-20. Example aircraft being weighed.
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By analyzing the data identified for the airplane being weighed in figure 4-20, the complying with needed information is determined.Because the aircraft was weighed with the fuel tanks full, the complete weight that the fuel must be subtracted and the unusable fuel added back in. The load of the fuel gift subtracted is based on the pounds every gallon identified by the hydrometer examine (5.9 lb/gal).Because wheel chocks are offered to save the airplane indigenous rolling turn off the scales, their weight must be subtracted from the scale 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 also the distance from the datum to the main wheel centerline (70″). Therefore, the eight for the nosewheel is −30″.
To calculation the airplane’s north weight and empty weight center of gravity, a six obelisk chart is used. Figure 4-21 shows the calculation for the airplane in Figure 4-20.Figure 4-21. Center of heaviness calculation for plane being weighed.
Based on the calculation shown in the chart, the center of gravity is in ~ +50.1″, which way it is 50.1″ aft of the datum. This locations the facility of gravity forward of the main landing gear, which need to be the case for a tricycle equipment airplane. This number is the an outcome of dividing the total moment the 66,698 in-lb by the total weight of 1,331.5 lb.
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