POH / AFM
AQUILA AT01-100A Section 1
GENERAL
Document Nr.: Issue: Supersedes Issue: Date: Page:
FM-AT01-1010-101 A.06 A.02 (15.10.2013) 01.06.2018 1 - 10
1.11.2 Weight and Balance
Reference Datum: An imaginary vertical plane from which all horizontal
distances are measured for balance purposes
Reference Line: fixed horizontal reference line
Lever Arm: The horizontal distance from the reference datum to the
center of gravity (C.G.) of an item
Moment: The product of the weight of an item multiplied by its lever
arm
Empty Weight: Weight of the aircraft including unusable fuel, full operating liquids
and full oil.
Max. Takeoff Weight: Maximum permissible weight approved for the conduction of
the takeoff run
Useful Load: Difference between takeoff weight and basic empty weight
Usable Fuel: Fuel available for flight planning
Unusable fuel: Fuel remaining in the fuel tanks that cannot be safely used in flight.
Center of Gravity (C.G.): The point at which the aircraft would balance if it were possible to
suspend it at that point
MAC: mean aerodynamic chord
MTOW: maximum takeoff weight
MWL: maximum landing weight
MZFW: empty weight
1.11.3 Meteorological Terminology
ISA: International Standard Atmosphere
MSL: Altitude above sea level
OAT: Outside Air Temperature
QNH: Barometric pressure adjusted to sea level
SAT: Static Air Temperature - equal to OAT
VFR, Day: Beginning of morning civil twilight until end of evening civil twilight
(sun 6° below horizon)
VFR, Night: End of evening civil twilight until beginning of morning civil twilight
(sun 6° below horizon)
DVFR: Flight during the day according to visual flight rules
NVFR: Flight during the night according to visual flight rules