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The distance between the center of gravity and the datum is called...

  • A

    span width.

  • B

    balance arm.

  • C

    lever.

  • D

    torque.

The horizontal distance from the datum to any component part or any object loaded on the aircraft is called "Balance Arm", or "Lever Arm", or just "Arm". Objects or components can be located forward or aft of the datum line. By convention:

  • A load placed forward of the datum will have a negative arm and negative moment.
  • A load placed aft of the datum will have a positive arm and positive moment.

Also, the location of the Centre of Gravity (CG) is measured from the datum, thus the CG is a balance arm as well.

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