LEMAC and TEMAC are defined by distances from what reference?

LEMAC and TEMAC are defined by distances from what reference?

• A. The datum
• B. The leading edge
• C. The tail
• D. The wing root

Answer: (A)

LEMAC and TEMAC are defined by distances from a datum, a fixed reference line or plane chosen on the aircraft to serve as the origin for measurements. This datum provides a consistent origin for locating features along the airframe, which is essential for weight-and-balance calculations and for describing aerodynamic geometry. The leading edge and trailing edge of the mean aerodynamic chord are measured from that datum, and those distances define LEMAC and TEMAC. Using a fixed datum keeps these measurements repeatable and unambiguous across drawings, modifications, and different configurations.

LEMAC and TEMAC are defined by distances from a datum, a fixed reference line or plane chosen on the aircraft to serve as the origin for measurements. This datum provides a consistent origin for locating features along the airframe, which is essential for weight-and-balance calculations and for describing aerodynamic geometry. The leading edge and trailing edge of the mean aerodynamic chord are measured from that datum, and those distances define LEMAC and TEMAC. Using a fixed datum keeps these measurements repeatable and unambiguous across drawings, modifications, and different configurations.