Tecnam P92 Echo MKII - Page 19

Page 1 -11
Section 1 - General
ACRONYMS AND TERMINOLOGY
1
st
Edition - Rev. 0
WEIGHT AND BALANCE TERMINOLOGY
Datum
“Reference datum” is an imaginary vertical
plane from which all horizontal distances are
measured for balance purposes.
Arm
is the horizontal distance of an item measured
from the reference datum.
Moment
is the product of the weight of an item multi-
plied by its arm.
C.G.
Center of Gravity is the point at which the
airplane, or equipment, would balance if sus-
pended. Its distance from the reference datum
is found by dividing the total moment by the
total weight of the aircraft.
Standard Empty Weight
is the weight of the aircraft with engine fluids
and oil at operating levels.
Basic Empty Weight
is the standard empty weight to which it is
added the optional equipment weight.
Useful Load
is the difference between maximum take-off
weight and the basic empty weight.
Maximum Take-off Weight
is the maximum weight approved to perform
the take-off.
Maximum Landing Weight
is the maximum weight approved for the land-
ing touchdown (for P92 Echo MKII it is
equivalent to the Maximum Takeoff Weight).
Tare
is the weight of chocks, blocks, stands, etc.
used when weighing an airplane, and is in-
cluded in the scale readings. Tare is deducted
from the scale reading to obtain the actual
(net) airplane weight.