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What does the FMS compute during normal LNAV mode?
  • A
    The lateral flight path with regard to the theoretical performance of the aircraft from the performance database.
  • B
    The optimum vertical flight profile, taking into account efficient fuel consumption based on the cost index.
  • C
    The great circle track between two or more waypoints, based on IRS, VOR, DME and GNSS information.
  • D
    The altitude restrictions of the airspace above, and the minimum crossing altitude of a waypoint.

The FMS computes the optimum route between two waypoints. Therefore, this will be a great circle. The FMS will process nav data from all sources through an algorithm known as “Kalman filter”. This gives the best position and navigation solution to the crew.

Note: options containing vertical and altitude are referring to VNAV.

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