FAA Advisory Circular 43.13-1B
Acceptable Methods, Techniques, and Practices
Aircraft Inspection and Repair
AC 43.13-1B | 10. Weight and Balance | 1. Terminology | 10-2. Terminology
AC43.13-1B CHG 1
9/27/01
FIGURE 10-3. Example of moment computation.
datum. The c.g. of the loaded aircraft must be
within these limits at all times as illustrated in
figure 10-7.
m. Mean Aerodynamic Chord (MAC).
The MAC is established by the manufacturer
who defines its leading edge and its trailing
edge in terms of inches from the datum. The
c.g. location and various limits are then ex-
pressed in percentages of the chord. The
location and dimensions of the MAC can be
found in the Aircraft Specifications, the
TCDS, the aircraft flight manual, or the air-
craft weight and balance report.
n. Weighing Point. If the c.g. location is
determined by weighing, it is necessary to ob-
tain horizontal measurements between the
points on the scale at which the aircraft’s
weight is concentrated. If weighed using
Page 10-4
Par 10-2