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Refer to figure.
From the data given at the appendix and assuming a fuel index shift of – 5.7 from the ZFM loaded index, determine which of the following is the correct value (percentage MAC) for the position of the centre of gravity at Take Off Mass.
  • A
  • B
  • C
  • D

Refer to figure.
First we identify takeoff mass:
Takeoff mass = DOM + takeoff fuel + traffic load = 59 800 kg

We make a line representing TOM
We go left in the fuel index a value of (-5.7)
We go down till intercepting takeoff mass line we draw before.

CG at takeoff = 18% (approx. 18.3%)

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