WEIGHT AND BALANCE TERMINOLOGY
Reference Datum
An imaginary vertical plane from
which all horizontal distances are
measured for balance purposes.
Station
A location along the airplane fuselage
usually given in terms of distance from
the reference plane.
Arm
The horizontal distance from the
reference datum to the center gravity
(CG) of an item.
Moment
The product of the weight of an item
multiplied by its arm. (Moment
divided by a constant may be used to
simplify balance calculations by
reducing the number of digits).
Airplane Center of
Gravity (CG)
The point at which an airplane would
balance if suspended. Its distance
from the reference datum is found by
dividing the total moment by the total
weight of the airplane.
CG Arm
The arm obtained by adding the
airplane's individual moments and
dividing the sum by the total weight.
CG Limits
The extreme center of gravity
locations within which the airplane
must be operated at a given weight.
Usable Fuel
The fuel available for flight planning
purposes.
Unusable Fuel
Fuel remaining after a run out test has
been completed in accordance with
governmental regulations.
Standard Empty
Weight
Weight of a standard airplane
including unusable fuel, full operating
fluids and full oil.
Basic Empty
Weight
Standard empty weight plus any
optional equipment.
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