LEMAC and TEMAC are defined in terms of distance from which reference point?

LEMAC and TEMAC are defined in terms of distance from which reference point?

• A. From the datum.
• B. From the wing leading edge.
• C. From the tail.
• D. From the aircraft center of gravity.

Answer: (A)

In weight and balance, all arm measurements are taken from a fixed reference point called the datum. LEMAC (Leading Edge Mean Aerodynamic Chord) and TEMAC are defined by their distances from that datum, which sets the reference line for locating the leading-edge positions on the wing and tail used in moment calculations. The datum is the zero point; the CG is not used as the reference for these measurements but is the outcome you determine from the computed moments. So the correct understanding is that LEMAC and TEMAC are defined in terms of distance from the datum.

In weight and balance, all arm measurements are taken from a fixed reference point called the datum. LEMAC (Leading Edge Mean Aerodynamic Chord) and TEMAC are defined by their distances from that datum, which sets the reference line for locating the leading-edge positions on the wing and tail used in moment calculations. The datum is the zero point; the CG is not used as the reference for these measurements but is the outcome you determine from the computed moments. So the correct understanding is that LEMAC and TEMAC are defined in terms of distance from the datum.