Tecnam P92 Echo MKII, Flight Manual

Page: 19 / 162

Page 1 -11
Section 1 - General
ACRONYMS AND TERMINOLOGY
1
st
Edition - Rev. 0
W
EIGHT 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.