Weight And Bal A Nce Terminol O - Cessna 172SPHUSR05 Pilot Operating Handbook

CESSNA
MODEL 1 72S
WEIGHT ANP BALANCE TERMINOLOGY
Reference
Reference Datum
Datum
which all horizontal distances are measured for
balance purposes.
Station
Station
in terms of the distance from the reference datum .
Arm Arm
datum to the center of gravity (C.G.) of an item.
Moment
Moment
multiplied by its arm. (Moment divided by the constant
1 000 is used in this handbook to simplify balance
calculations by reducing the number of digits.)
Center of
Center of Gravity
Gravity
equipment, would balance if suspended. Its distance
(C.G.)
from the reference datum is found by dividing the
total moment by the total weight of the airplane.
C.G.
Center of Gravity Arm
Arm adding the airplane's individual moments and dividing
the sum by the total weight.
C.G.
Center of Gravity Limits
Limits
gravity locations within which the airplane must be
operated at a given weight.
Standard
Standard Empty Weight
Empty
airplane, including unusable fuel, full operating fluids
Weight
and full engine oil.
Basic Empty Basic Empty Weight
Weight
plus the weight of optional equipment.
Useful Load
Useful Load
and the basic empty weight.
MAC
MAC (Mean Aerodynamic Chord)
imaginary rectangular airfoil having the same pitching
moments throughout the flight range as that of the
actual wing.
July
8/98
is an imaginary vertical plane from
is a location along the airplane fuselage given
is the horizontal distance from the reference
is the product of the weight of an item
is the point at which an airplane, or
is the arm obtained by
is the standard empty weight
is the difference between ramp weight
are the extreme center of
is the weight of a standard
is the chord of an
SECTION 1
GENERAL
1-11