FMS GENERAL DESCRIPTION
10 FMGS OPERATION
Navigation information
In addition to FMS position, the following information is calculated and
displayed:
−
Magnetic ground track.
The magnetic track is derived from true track and the magnetic
variation data base stored in the FMGC.
This information becomes invalid beyond the 73° north / 60° south
latitudes due to aircraft limitation and unreliable magnetic variation
in these areas.
−
Ground speed
−
True Wind
In Flight Performance
The minimum entries required to compute a flight profile are: cruise
flight level, cost index, aircraft weight and CG, fuel at departure. These
data are normally inserted during the preflight initialization.
Additional entries may be inserted to improve the flight profile and
predictions e.g.: Wind, Temperature and Tropopause, aircraft
parameters (Idle/Perf) factors, Step Altitude if applicable.
Speed and/or altitude constraints can be inserted in the flight plan. The
FMS will manage the profile (speed and/or rate of climb/descent) to
comply with the constraints.
In preflight phase the FMS uses the entered data to:
−
Compute optimum speed in each flight phase,
−
Provide predictions of time, altitude passing, top of climb, top of
descent, fuel,
−
Determine Optimum and Maximum flight levels.
In flight, the predictions at each waypoint of the profile are updated
using groundspeed based on actual wind velocity blended with flight
planned data. When using selected mode (SPD/MACH, OP CLB, OP
DES, V/S or FPA), the FMGC recomputes the predictions based on the
selected parameters until the end of current FMS flight phase.
Caution
Performance computation is based on the performance model stored in
the FMS, including the one-engine out performance.
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© THALES AVIONICS S.A.
AIRBUS A318/319/320/321
Summary of Contents for FMGS
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