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With the reference to mass and balance calculations (on an aeroplane) a datum point is used. This datum point is
  • A
    a point near the centre of the aeroplane .It moves longitudinally as masses are added forward and aft its location
  • B
    the point through which the sum of mass values (of the aeroplane and its contents) is assumed to act vertically
  • C
    a fixed point from which all balance arms are measured. It may be located anywhere on the aeroplane’s longitudinal axis or on the extensions to that axis
  • D
    a point from which balance arms are measured. the location of this point varies with the distibution of loads on the aeroplane

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