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Weight Control
Officer Approved
Jabiru J400
Section: 6
Publication JP OM15
Owners Manual
6.3.Loading System
6.3.1.General
The load and trim system for this aircraft is provided in the form of a trim chart, which
is shown with sample calculations at Figure 6-1, and as a blank chart in Figure 6-2
These charts, Figure 6.1 & Figure 6-2, are graphic representations of the weight
and balance calculations for the aircraft and represent an acceptable method of
ensuring that the aircraft is correctly loaded.
The aircraft is loaded correctly, only if
both
the
zero fuel
and the
takeoff
cases fall
inside the line on the “Aircraft Trim Conditions” graph given in Figure 6-1
The chart is based on an aircraft “EMPTY WEIGHT TRIM INDEX” which is
calculated using the following formula:
{(Aircraft Empty Weight) * (Empty Weight Arm)}
Empty Weight
Trim Index
=
1000
Example Trim Index Calculation:
Aircraft Empty Weight
=
323-kg
Aircraft Empty Weight Arm
=
68-mm aft of datum
Empty Weight Trim Index
=
(323 * 68) / 1000
=
21.9
The Chart performs two functions. The vertical scales on the Right Hand side of the
chart provide a graphical method to calculate the operating weights of the aircraft,
while the horizontal scales at the top of the chart provide a graphical method to
calculate the cg positions.
REVISIO
N
0
1
2
Dated July 02
Page: 6-
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