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During start-up, the pilot notices the unserviceability of an item mentioned in the Minimum Equipment List (MEL). He/she wrongly concludes that this has an impact on the performance of the aircraft. Because of this, the pilot wants to change aircraft settings in the performance database on the FMS. On the INIT page, the pilot...
  • A
    can only confirm the current aircraft model and type.
  • B
    can select the MEL items that are unserviceable and the FMS will take this into account.
  • C
    can only change parameters related to the fuel consumption.
  • D
    can select the sub-menu of the performance database and can change whatever data he/she thinks is needed.

Refer to figure.
The information stored in the FMC is called its database. The database is divided into two major sections: One contains performance related information and the other contains information dealing with navigation.

The Aircraft Performance database includes de Engine model, Aerodynamical model and Performance model. The data stored in the database includes aircraft drag and engine characteristics, maximum and minimum speeds. Maintenance can refine the database for each aircraft by entering factors for drag and fuel flow

Generally, in the cockpit preparation phase and before starting to program the FMGS, the pilots will check both databases. The performance database is checked by confirming the Engine and Aircraft type as well as the performance factor. The navigation database validity is checked by confirming the current day is within the validity interval. If any of these databases are wrong (wrong engine/aircraft or validity expired) an authorised mechanic has to change it to the correct one.

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