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Refer to figure or CAP 696 File 2.1. Where is the datum of the aircraft located?

  • A
    87.7 inches forward of the mainwheels.
  • B
    74.0 inches forward of the elevator.
  • C
    39.0 inches aft of the firewall.
  • D
    97.0 inches forward of the mainwheels.
Refer to figure.

The location of the aircraft datum is decided by the manufacturer. It can be:

  • Ahead of the aircraft
  • On the nose
  • Within the aircraft, perhaps on the engine bulkhead of a light aircraft, or
  • Behind the aircraft

In some cases, the datum is located by measuring from a fixed point on the aircraft, called "the reference point". It is important to remember that the datum is not the centre of gravity, it is just a measuring point.

For this question, according to the figure, the datum is 97.0 inches forward of the mainwheels.

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