Textron Aviation Cessna 172S NAV III Skyhawk SP, Information Manual

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SECTION 1 CESSNA
GENERAL MODEL 172S NAV III
KAP 140 AUTOPILOT
U.S.
SYMBOLS, ABBREVIATIONS AND TERMINOLOGY
(Continued)
WEIGHT AND BALANCE TERMINOLOGY
Reference
Datum Reference Datum is an imaginary vertical plane from
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 constant
1000 is used in this POH to simplify balance
calculations by reducing the number of digits.)
Center of
Gravity
(C.G.) 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.
C.G. Arm Center of Gravity Arm is the arm obtained by adding
the airplane's individual moments and dividing the sum
by the total weight.
C.G. Limits 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 Standard Empty Weight is the weight of a standard
airplane, including unusable fuel, full operating fluids
and full engine oil.
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172SPHAUS-05
1-14
For
Training
Purposes
Only