Weight And Balance Terminology - Cessna Hawk XP R172K Pilot Operating Handbook

SECTION 1
GENERAL
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JI';L R172K
WEIGHT AND BALANCE TERMINOLOGY
Reference
Datum
Station
Arm
Moment
Center of
Gravity
(C. G.)
C.G.
Arm
C.G.
Limits
Standard
Empty
Weight
Basic
Empty
Weight
Useful
Load
Gross
(Loaded)
Weight
1-8
Reference l>al.ullI iH
:1.11
unu.g
inary vertical plane from
which all lIori:t.ollt.al distances are measured for balance
purposes.
Statioll i~; a location along the airplane fuselage given in
tertllSt)f tlw distance from the reference datum.
Arm is I.lIe horizontal distance from the reference datum to
the
con
tor of g"ravity (C.G.) of an item.
Moment is the product of the weight of an item multiplied
by its arm. (Moment divided by the constant
1000
is used
in this handbook to simplify balance calculations by re-
ducing" the number of digits.)
Center of Gravity is the point at which an airplane,
or equipment, would balance if suspended. Its distance
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 total weight.
Center of Gravity Limits are the extreme center of gravity
locations within which the airplane must be operated at a
given weight.
Standard Empty Weight is the weight of a standard air-
plane. including unusable fuel, full operating" fluids and
full engine oil.
Basic Empty Weight is the standard empty weight plus the
weight of optional equipment.
Useful Load is the difference between takeoff weight
and the basic empty weight.
Gross (Loaded) Weight is the loaded weight of the air-
plane.
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Maximu m
Takeoff
Weight
Maximum
Landing
Weight
Tare
~;I':( ~'I'I(IN
t
(, I': N I':Il,A I,
Maximum Takeoff Weight is the maximum weight ap-
proved for the start of the takeoff run.
Maximum Landing Weight is the maximum weight ap-
proved for the landing touchdown.
Ta~e is the weight of chocks, blocks, stands, etc. used when
~elghing an airplane, and is included in the scale read-
mgs. Tare is deducted from the scale reading to obtain the
actual (net) airplane weight.
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