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The CG limits of an aircraft are between 4.08 m and 4.32 m aft of the datum. The Take-Off Mass of an aircraft is 3195 kg and the calculated CG is at 4.35 m aft of the datum. If a mass of 84 kg can be moved, what is the distance the mass should be moved in order to get a CG at the aft limit?

  • A

    10 cm aft

  • B

    88 cm forward

  • C

    114 cm forward

  • D

    152 cm aft

Use the formula:

Mass Change / Total Mass = Change of CG / Distance

  • Mass Change: 84 kg
  • Total Mass: 3195 kg
  • Change of CG: 4.35 m - 4.32 m = 0.03 m = 3 cm
  • Distance: ?

84 kg / 3195 kg = 3 / Distance
Distance = (3195 kg x 3 cm) / 84 kg
Distance = 114 cm

The CG has to be moved forward (from 4.35 m aft of datum to 4.32 m aft of datum), so the mass must be moved 114 cm forward.

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