Jabiru Aircraft
Pilot’s Operating Handbook
Model J120-C
JP-FM-10
Revision:
0
28 Nov 2007
Page 29 of 50
4.2
Trim Sheets
A metric trim sheet has been provided. An example loading has been worked through for
reference.
4.2.1
Trim Sheet Index Units
To use the trim sheets the aircraft’s weight and balance information must be converted to “Trim
Sheet Index Units” using the formula below:
Trim Sheet Index Units = Aircraft Weight x (Arm – 1403)
1000
“Aircraft Weight” and “Arm” are written onto the aircraft’s Load Data Sheet.
For example, an aircraft with “Aircraft Weight” of 260kg and “Arm” of 1590mm has a Trim Sheet
Index Unit of 48.62 This is used for the starting point of using the Trim Sheets.
Calculate Aircraft Weights
1-1
Use the Aircraft Empty Weight obtained from the latest aircraft weighing records to
enter the vertical “Aircraft Empty Weight Scale” on right hand side of the chart.
1-2
Move horizontally to the left into the next scale which is the “Crew Weight” Scale.
1-3
Move vertically downward one line on this scale for each 10-kg of weight that is
placed on the front seats, and mark a point.
1-4
Move horizontally to the left from the point made in Step 1-3 to enter the next scale
which is the “Baggage Weight” Scale.
1-5
Move vertically downward one line on this scale for each 5-kg of weight that is placed
in Baggage Zone and mark a point.
1-6
Move horizontally to the left from the point made in Step 1-7 to enter the next scale
which is the “Fuel Quantity” Scale and mark a point, This point is the “Zero Fuel
Weight Reference Point”
1-7
Move Horizontally to the left of the “Zero Fuel Reference Point” and Mark a “Zero
Fuel Weight Line” across the “Aircraft Trim Condition” Graph.
1-8
From the “Zero Fuel Point” on the “Fuel Quantity Scale” (marked in Step 1-8), move
vertically downward one line for each 10-
litres
of fuel being carried at the take-off
condition. Mark this “Take-Off Fuel Point” on the scale.
1-9
Move horizontally to the left, and mark a “Take-Off Fuel Weight Line” across the
“Aircraft Trim Condition” graph.