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CESSNA
MODEL
182S
c.G.
Arm
c.G.
Limits
SECTION
1
GENERAL
WEIGHT
AND BALANCE
TERMINOLOGY
Reference
Reference Datum
is
an imaginary vertical plane from
Datum
which
all
horizontal distances
are
measured for
balance purposes.
Station
Station is a
location along
the
airplane fuselage given
in
terms
of
the distance from
the
reference datum.
Arm
Arm is the
horizontal distance from
the
reference
datum to the center of gravity (C.G.) of an
item.
Moment
Moment
is the
product
of
the
weight
of an
item
multiplied
by
its
arm.
(Moment
divided
by
the
conslant
1000
is
used
in this
handbook
to
simplify
balance
calculations by reducing the number of digits.)
Center
of
Center of Gravity
is
the point
at
which an airplane, or
Gravity
equipment, would balance
if
suspended. lts distance
(C.G.)
from
the
reference datum
is
found by dividing
the
total
moment
by
the total weight
of
the airplane.
Center of Gravity Arm
is
the arm obtained by
adding the airplane's individual
moments
and
dividing
the sum
by
the
totalweight.
Center of Gravity Limits
are
the
extreme center of
gravity locations within which
the
airplane must
be
operated
at
a given weight.
Standard
Standard Empty Weight
is
the weight
of a
standard
Empty
airplane, including unusable fuel, full operating fluids
Weight
and full engine
oil.
Basic
Empty
Basic Empty Weight
is
the standard empty weight
Weight
plus the weight of optional equipment.
Useful
Load
Useful Load is the
difference between ramp
weight
and
the
basic empty weight.
MAC
MAC (Mean Aerodynamic Chord)
is a
chord
of
an
imaginary
rectangular
airfoil having the same
pitching
moments throughout
the flight range as that
of
the
actualwing.
Feb
3197
1-11
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