DA 42 AFM Mass and Balance
Doc. No. 7.01.05-E Rev. 8 15-Dec-2017 Page 6 - 7
CAUTION
If the auxiliary tanks are in use, both tanks must be refueled
to the maximum level to provide proper information for the
pilot about the fuel quantity in the auxiliary fuel tanks.
If the auxiliary tanks are not in use, the pilot must ensure that
they are empty.
4. Multiply the individual masses by the moment arms quoted to obtain the moment for
every item of loading and enter these moments in the appropriate boxes in Table
6.4.3 - CALCULATION OF LOADING CONDITION.
5. Add up the masses and moments in the respective columns. The CG position is
calculated by dividing the total moment by the total mass (using row 8 for the condition
with empty fuel tanks, and row 11 for the pre take-off condition). The resulting CG
position must be inside the limits.
As an illustration the total mass and the CG position are entered on Diagram 6.4.4 -
PERMISSIBLE CENTER OF GRAVITY RANGE. This checks graphically that the
current configuration of the airplane is within the permissible range.
6. Graphical method:
Diagram 6.4.2 - LOADING DIAGRAM is used to determine the moments. The masses
and moments for the individual items of loading are added. Then Diagram 6.4.5 -
PERMISSIBLE MOMENT RANGE is used to check whether the total moment
associated with the total mass is in the permissible range.
The result found with the graphical method is however inaccurate. In doubtful cases
the result must be verified using the exact method given above.
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