Diamond DA 40 Flight Manual page 26

General
(c) Flight Performance and Flight Planning
Demonstrated Crosswind Component:
The speed of the crosswind component at which adequate
maneuverability for take-off and landing has been demonstrated during
type certification.
MET: Weather, weather advice.
NAV: Navigation, route planning.
(d) Mass and Balance (M&B, W&B)
DP: Datum Plane; an imaginary vertical plane from which all horizontal
distances for center of gravity calculations are measured.
Moment Arm: The horizontal distance from the Datum Plane to the Center of Gravity
of a component.
Moment: The mass of a component multiplied by its moment arm.
CG: Center of Gravity, also called 'center of mass'. Imaginary point in which
the airplane mass is assumed to be concentrated for mass and balance
calculations. Its distance from the Datum Plane is equal to the Center
of Gravity Moment Arm.
Center of Gravity Moment Arm:
The Moment Arm which is obtained if one divides the sum of the individual
moments of the airplane by its total mass.
Center of Gravity Limits:
The Center of Gravity range within which the airplane, at a given mass,
must be operated.
Page 1 - 10 Rev. 8 01-Dec-2010
DA 40 AFM
Doc. # 6.01.01-E