Jabiru Aircraft
Pilot Operating Handbook
Model J170-D
JP-FM-13
Revision:
0
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28 Feb 2020
Page 6-61
6.5.3
Calculating the Operating CG Locations
2-1.
Take the calculated Empty Weight Trim Index and mark its position on the Aircraft
Index Units Ladder at the top of the sheet.
2-2
Draw a vertical line down from the point marked above to intersect with a sloping line
in the “Crew Index Units” scale and mark this point.
2-3
Calculate the weight of the crew and round this value to the nearest 10-kg.
2-4
Move horizontally to the right from the point marked in Step 2-2 one line for each 10-
kg of load calculated. (i.e. 60-kg = 6 lines) and mark a point at this location.
2-5
Draw a vertical line down from the point marked above to intersect with a sloping line
in the Baggage Area scale and mark this point.
2-6
Calculate the weight that will be placed Baggage Area and round this value to the
nearest 5-kg.
2-7
Move horizontally to the right from the point marked in Step 2-5 one line for each 5-kg
of load calculated. (i.e. 20-kg = 4 lines) and mark a point at this location.
2-8
Drop a vertical line down from the point marked in Step 2-10 to intersect a sloping line
in “Fuel Chart”, and mark a point at this location.
2-9
Continue the Vertical Line began in Step 2-
11 down to intersect with the “Zero Fuel
Weight Line” drawn in Step 1-9. mark this point as the “ZERO FUEL Condition”
2-10
Move horizontally to the right from the point marked in Step 2-
11 in the “Take-Off Fuel
Box”, one line for each 10 litres of take-off fuel, and mark this point.
2-11
Move vertically downward from the take-off fuel point marked in Step 2-13 to intersect
with the “Take-Off Fuel Weight Line” marked in Step 1-9. Mark this point the “Take-
Off Condition”
6.5.4
Allowable Loading Conditions
An allowable loading condition exists when both the “Zero Fuel Condition”, and the “Take-Off
Condition” fall with the area bounded by the Line in the Aircraft Trim Conditions Box.
