Searey LSA – Pilot’s Operating Handbook Version 5.0, Revision 8
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Actual individual weight of each item such as airframe, persons, fuel,
baggage, cargo, etc., in pounds or kilograms.
6.1.1.2.9 ARM
Horizontal distance, along the longitudinal axis, measured between
centroids of an object in the aircraft and the datum line.
6.1.1.2.10 MOMENT
Obtained by multiplying the weight of an item by its arm.
6.1.1.2.11 INSTALLED EQUIPMENT
All optional accessories and equipment permanently installed on an
airframe or engine at the time of weighing. These items must be listed in
the “List of Installed Equipment”. Additions and deletions must be noted
in the list each time they are made and new weight and balance
calculations performed to determine the magnitude and effect of weight
change. Ballast, if permanently installed, must also be listed.
6.1.1.2.12 BALLAST
A specific amount of weight attached in a specific location, which can be
temporarily or permanently installed in an aircraft, to help bring its center
of gravity within the required limits. If temporary ballast must be used for
certain operations, the exact amount and its location must be known for
recalculation of weight and balance. A ballast compartment is provided in
the very front of the nose of the hull, forward of the battery.
6.1.1.2.13 LOADING CHART
Used to calculate the actual center of gravity location of a ready to fly
aircraft. Care must be taken not to exceed the maximum/minimum weight
and balance limits stipulated for the aircraft. These limits are determined
by structural, stability and control considerations of a particular design.
WARNING: Sometimes it is necessary to adjust or reduce fuel, cargo, or
passenger weights to remain at or below maximum allowable gross
weight. A temporary or permanent ballast is sometimes necessary to bring
the C.G. within specified limits. However, the maximum allowable gross
weight should not be exceeded under any circumstances.
6.2 OPERATING WEIGHT AND LOADING (OCCUPANTS, BAGGAGE, FUEL, BALLAST)
Write the Empty Weight, the Empty Weight Arm and the Moment in the
top line of the Loading Chart located in the Weight and Balance Form.
Fuel weight is calculated at 6 lbs. per U.S. gallon.
Write in the actual Fuel Arm for your aircraft. See Weight and Balance
Data Sheet for the correct distance to use.
Write in the actual weight of pilot/passenger. Be sure not to exceed the
maximum recommended pilot/passenger weights.
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