Tecnam P-Mentor - Page 28

1
st
Edition - Rev. 0
Section 1 – GENERAL
ACRONYMS AND TERMINOLOGY
P-Mentor – Aircraft Flight Manual Page 1 - 12
9.6. 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
multiplied by its arm.
C.G.
Center of Gravity is the point at which
the 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 aircraft.
Standard Empty Weight is the weight of the aircraft with engine
fluids and oil at operating levels.
Basic Empty Weight (BEW) 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
(MTOW)
is the maximum weight approved to
perform the take-off.
Maximum Landing Weight
(MLW)
is the maximum weight approved for the
landing touchdown.