MAC - Mean Aerodynamic Chord of a wing is the chord of an imaginary
airfoil which will have the same force vectors as those of the actual wing,
throughout the ight range.
Maximum Landing Weight – The maximum weight approved for the landing
touchdown.
Maximum Ramp Weight – The maximum weight approved for ground
operations. This includes the weight of fuel used for starting, taxi, and
runup.
Maximum Takeoff Weight – The maximum weight approved for the start of
takeoff roll.
Moment – The product of the weight of an item multiplied by its arm. (The
actual moment divided by a constant of 1000 is used to simplify balance
calculations by reducing the number of digits.)
MZFW - Maximum Zero Fuel Weight – The maximum allowable weight of
the airplane and all its contents, minus the total weight of the fuel on board.
Ramp Condition – The weight and moment of the aircraft prior to taxi.
Reference Datum – An imaginary vertical plane from which all horizontal
distances are measured for weight and balance purposes.
Residual Fuel – Another name for undrainable fuel or the fuel remaining
when the airplane is de-fueled. Residual fuel is considered to be a part of
the empty weight of the aircraft.
Standard Empty Weight – The weight of a standard airplane including any
residual fuel, full operating uids and full engine oil.
Station – A location along the airplane fuselage usually expressed in terms of
distance from the reference datum.
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