Where is the datum located?

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Multiple Choice

Where is the datum located?

The datum is a fixed reference point along the aircraft’s longitudinal axis used to calculate weight and balance moments. It’s defined by the manufacturer in the airplane’s weight-and-balance data. For this airplane, the published data specify the datum location as 78.4 inches forward of the wing leading edge. That means all arms are measured from a point ahead of the wing, not above it or behind the wing. The other statements describe positions that aren’t how this aircraft’s datum is defined (a vertical offset or a position behind the wing), so they don’t match the data.

The datum is a fixed reference point along the aircraft’s longitudinal axis used to calculate weight and balance moments. It’s defined by the manufacturer in the airplane’s weight-and-balance data.

For this airplane, the published data specify the datum location as 78.4 inches forward of the wing leading edge. That means all arms are measured from a point ahead of the wing, not above it or behind the wing. The other statements describe positions that aren’t how this aircraft’s datum is defined (a vertical offset or a position behind the wing), so they don’t match the data.

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