Cessna SKYHAWK 1976 Pilot Operating Handbook page 13

1-8
SECTION 1
GENERAL
Arm
Moment
Center of
Gravity
(C. G.)
C.G.
Arm
C. G.
Limits
Standard
Empty
Weight
CESSNA
MODEL 172M
Arm is the horizontal distance from the reference datum to
theCenter of gravity (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 reducing
the number of digits. )
Center of Gravity is the point at which an airplane, or equip­
ment, 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 airplane,
including unusable fuel, full operating fluids and full engine
oil.
Basic Empty Basic Empty Weight is the standard empty weight plus the
Weight
Useful
Load
Gross
(Loaded)
Weight
Maximum
Takeoff
Weight
Maximum
Landing
Weight
Tare
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 airplane.
Maximum Takeoff Weight is the maximum weight approved
for the start of the takeoff run.
Maximum Landing Weight is the maximum weight approved
for the landing touchdown.
Tare is the weight of chocks, blocks, stands, etc. used
Wilen
weighing an airplane, and is included in the scale read­
ings. Tare is deducted from the scale reading to obtain the
actual (net) airplane weight.