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The CG limits of an aircraft are from 83 inches to 93 inches aft of the datum.The CG as loaded is found to be at 81 inches aft of the datum. The loaded mass is 3240 lbs. How much mass must be moved from the forward hold, 25 inches aft of the datum, to the aft hold, 142 inches aft of the datum, to bring the CG onto the forward limit?

  • A
    55.38 lbs.
  • B
    82.09 lbs.
  • C
    74.96 lbs.
  • D
    22.49 lbs.

The CG change so as to bring the CG onto the forward limit is: 83 in. - 81 in. = 2 in. and the mass must be moved from the forward hold to the aft hold (Distance moved) by: 142 in. - 25 in. = 117 in.

The amount of mass that must be moved to the aft hold compartment can be found by applying the "Shifting Load" formula: Mass Change / Total Mass = Change of CG / Distance Moved.

Solving for Mass Change, we get the mass that must be moved: Mass Change = Change of CG x Total Mass / Distance Moved = 2 in. x 3 240 lbs / 117 in. = 55.38 lbs.

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