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A baggage weighing 50 kg is tied down to the baggage zone of the aircraft and the moment is -5 000 kg.mm. The arm of the baggage zone is…
  • A
    -100 mm and it is located forward of the datum.
  • B
    -100 mm and it is located aft of the datum.
  • C
    -10 mm and it is located aft of the datum.
  • D
    +100 mm and it is located forward of the datum.

The Moment is a turning force created around a datum by the mass, over a distance or lever arm: Moment = Mass x Arm.

Moments and arms forward of the datum are by convention negative and those aft of the datum are positive.

Thus, solving for Arm, we get: Arm = Moment / Mass = - 5000 kg.mm / 50 kg = -100 mm and the "-" sign implies that it is located forward of the datum.

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