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What is the principle of the Index method?
  • A
    To compute the CG position and stabiliser trim setting without completing a load sheet.
  • B
    To refer every item of the aircraft to a position called the BA (Balance Arm).
  • C
    To determine the CG position by reference to the Mean Aerodynamic Chord.
  • D
    To divide high-magnitude moments by a constant and make them more user-friendly.

When completing load sheets, particularly for large aircraft, it is convenient to use an Index to represent the large numbers involved and to simplify the calculations.

Generally, Loading Index is a non-dimensional figure (i.e. a figure without unit of measurement) that is a scaled down value of a moment and the effect of reducing the magnitude of the moment to one that is much easier to use.

A Loading Index (LI) is simply a high-magnitude Moment (Load Mass x CG Arm) divided by a constant: LI = (Load Mass x CG Arm) / Constant = Load Moment / Constant.

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