Piper Cherokee Archer II Pilot Operating Handbook page 18

SECTION 1
GENERAL
PIPER AIRCRAFT CORPORATION
I'A-28-181, CHEROKEE ARCHER
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Weight and Balance Terminology
Reference Datum
Station
Arm
Moment
Center of Gravity
(e.G.)
C.G. Arm
e.G. Limits
Usable Fuel
Unusable Fuel
Standard Empty Weight
Basic Empty Weight
Payload
Useful Load
Maximum Ramp Weight
Maximum Takeoff
Weight
Maximum Landing
Weight
Maximum Zero Fuel
Weight
REPORT: VB-790
1-8
An imaginary vertical plane from which all horizontal distances are
measured for balance pUIposes.
A location along the airplane fuselage usually given in terms of
distance from the reference datum.
The horizontal distance from the reference datum to the center of
gravity (e.G.) of an item.
The product of the weight of an item multiplied by its ann.
(Moment divided by a constant is used to simplify balance
calculations by reducing the number of digits.)
The point at which an airplane would balance if suspended. Its
distance from the reference datum is found by dividing the total
moment by the total weight of the airplane.
The arm obtained by adding the airplane's individual moments and
dividing the sum by the total weight.
The extreme center of gravity locations within which the airplane
must be operated at a given weight.
Fuel available for Ilight planning.
Fuel remaining after a runout test has been completed in
accordance with governmental regulations.
Weight of a standard airplane including unusable fuel, full
operating fluids and full oil.
Standard empty weight plus optional equipment.
Weight of occupants, cargo and baggage.
Difference between takeoff weight, or ramp weight if applicable,
and basic empty weight.
Maximum weight approved for ground maneuver. (It Includes
weight of start, taxi and run up fuel.)
,
Maximum weight approved for the start of the takeoff run.
Maximum weight approved for the landing touchdown.
Maximum weight exclusive of usable fuel.
ISSUED: JUNE 18, 1976
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