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While programming the FMS, the flight crew enters the wrong cruising level. What are the possible consequences?
  • A
    Speed, fuel burn, and time will not be updated.
  • B
    The FMS predictions will give bad results to the flight crew.
  • C
    The FMS will show a "DATA ERROR" message.
  • D
    It is not possible to enter a new cruising flight level once in flight.

Refer to figure.
FMGS programming involves inserting navigation data, then performance data. One of the first steps is to perform the flight plan initialisation. This includes inserting the desired cruising flight level so that the FMGC can calculate fuel and time predictions for the entered flight plan route.

If no cruise flight level is entered, the system will not furnish predictions, while the aircraft is on the ground.

If a wrong cruising level is inserted, all the predictions calculated by the FMGC will be done according to the inserted flight level. This will provide wrong results to the flight crew.

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