Index Unit

An index unit is a scaled-down moment value used to simplify manual weight and balance calculations. By dividing the actual moment by a constant factor, it prevents pilots from having to work with excessively large numbers on loading charts.

Key Points

• •Index units allow for simpler mental or manual arithmetic during weight and balance calculations.
• •The index unit system is specific to the loading system and scale provided in the aircraft flight manual.
• •Index units are always mathematically derived from the original weight × arm formula.

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