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BEECHCRAFT Sundowner
180
Section I
C23 (M-1285 and
After)
General
Arm
The
horizontal
distance from the
ref-
erence
datum
to the center
of gravity
(C.G.)
of
an item.
Moment
The
product
of
the
weight
of
an item
multiplied by its arm. (Moment divided
by a constant
is
used
to simplify bal-
ance calculations
by reducing the
number
of
digits.)
Airplane
The
point
at
which
an airplane
would
Center
of
balance
if
suspended.
Its distance
Gravity
from the
reference
datum
is
found
(C.G.)
by dividing the total moment by the
total weight of the airplane.
C.G. Arm
The arm
obtained
by
adding
the air-
plane's
individual
moments
and
dividing the sum by the total
weight.
C.G. Limits
The extreme center of
gravity
loca-
tions
within
which
the
airplane
must
be
operated
at a given weight.
Usable
Fuel
Fuel available
for flight
planning.
Unusable
Fuel
remaining after a runout test·
Fuel
has been
completed
in accordance
with
governmental
regulations.
Standard
Weight
of a standard
airplane
Empty
including
unusable
fuel, full
Weight
operating
fluids and full
oil.
Basic
Standard
empty weight
plus
Empty
optional
equipment.
Weight
February
1979
1-17
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