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After the pilot has set up the FMS and inserted an initial fuel quantity, the aircraft is still being refuelled. After refuelling, there's a big difference between the actual fuel and the fuel quantity inserted into the FMS. Which option is correct?
  • A
    A significant difference between the measured and inserted values will trigger an error caption.
  • B
    The calculations for the flight will be wrong and can only be corrected by re-initialising the FMS.
  • C
    Since the fuel quantity is critical data, the FMS computer will freeze and stop to calculate VNAV and LNAV data and must be reset.
  • D
    There is NO problem as the inserted quantity will be automatically updated to the actual value.

Refer to figures.
IMPORTANT NOTE: We would like to inform you that the correct option for this question has recently been updated to "A significant difference between the measured and inserted values will trigger an error caption." This update was made based on recent feedback. However, we would like to clarify that we do not entirely agree with this change. According to our perspective, we believe that option D, which states, "There is NO problem as the inserted quantity will be automatically updated to the actual value," should be considered the correct answer. If you encounter this question during your official exam, we kindly request you to inform us about it.


MCDU INIT FUEL PRED PAGE
The pilot uses this page to initialise the gross weight, center of gravity and block fuel, before starting the engines.

The FMGC will stop using the pilot-entered block fuel and will compute its predictions based on the FOB indicated by the FQI computer after the first engine start.

BLOCK: Crew may enter a block fuel for planning purposes. However, the FMS will take the fuel onboard from the fuel quantity indication system.

After the aircraft is refuelled, the pilots should:

- Check that the indicated Fuel On Board (FOB) corresponds to the Flight Plan
- Check that if any imbalance is present, it is within the limits
- compare the planned and actual uplift in mass (kgs or lbs). This will allow to identify any error or discrepancy that happened during the refuelling process. These discrepancies are generally limited by the Aircraft Flight Manual (AFM) and if out of limits a maintenance action is due.

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