Performance and weight and balanceQuestion 689 of 934

What is the datum?

  1. The forward point of the allowable CG range
  2. The CG position of the empty aircraft
  3. An imaginary plane used to measure arms
  4. The location of the main landing gear
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Correct answer: An imaginary plane used to measure arms

The manufacturer establishes the datum. The datum is station zero.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 10: Weight and Balance — Terms and Definitions, page 249

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Questions last reviewed: 18 October 2026