FMS GENERAL DESCRIPTION
8 FMGS OPERATION
When GPS is available:
Hybrid system - the three IRSs use GPS to
calculate a hybrid GPIRS position which is
sent to FMGC 1 and 2.
The IRS positions are corrected by the
FMGCs through the filter, using GPS
position, to determine the mixed best
FMGC position.
Autonomous system - IRS and GPS
positions are sent to FMGCs. IRS positions
are corrected by the filter to determine the
mixed best FMGC position.
Each FMGC uses its associated GPS and
calculates independently. There may thus
be a slight difference between the two
FMGC positions.
Note:
FMGC1, FMGC2, GPIRS or GPS positions
are shown to the pilot on the MCDU
POSITION MONITOR page.
When GPS is not available, (lack of
coverage, deselected or not installed), the
FMGCs use the IRS and radio position.
The IRS positions are corrected through
the filter to determine the mixed best
FMGC position.
Radio navaids are auto-tuned by the FMS
in order to determine the RADIO position.
Criteria, such distance, figure of merit,
intersection angle, are taken into account
to select VOR, DME, VOR/DME, VORTAC,
TACAN, ILS, ILS/DME, LOC/DME, or LOC,
MLS.
When GPS and radio positions are not
available the FMGCs use the triple mix IRS
best position to determine, through the
filter, the mixed best FMGC position.
POSITION MONITOR
FMGC1
5019.0N/00130.8E
3IRS/GPS
FMCG2
5019.1N/00130.7E
3IRS/GPS
GPIRS
5019.1N/00130.8E
MIX IRS
5019.9N/00130.1E
IRS1 IRS2 IRS3
NAV 1.5 NAV 1.0 NAV 2.2
SEL
<FREEZE
NAVAIDS>
GPS HYBRID
POSITION MONITOR
FMGC1
5019.0N/00130.8E
3IRS/GPS
FMGC2
5019.1N/00130.7E
3IRS/GPS
GPS
5019.1N/00130.8E
MIX IRS
5019.9N/00130.1E
IRS1 IRS2 IRS3
NAV 1.5 NAV 1.0 NAV 2.2
SEL
<FREEZE
NAVAIDS>
GPS AUTONOMOUS
POSITION MONITOR
FMGC1
5019.0N/00130.8E
3IRS/DME/DME
FMGC2
5019.1N/00130.7E
3IRS/DME/DME
RADIO
5018.6N/00131.8E
MIX IRS
5019.9N/00130.1E
IRS1 IRS2 IRS3
NAV 1.5 NAV 1.0 NAV 2.2
SEL
<FREEZE
NAVAIDS>
GPS PRIMARY LOST
POSITION MONITOR
FMGC1
4338.1N/00121.6E
3IRS
FMGC2
4338.6N/00122.9E
3IRS
RADIO
----.--/-----.
MIX IRS
4337.5N/00123.7E
IRS1 IRS2 IRS3
NAV 1.5 NAV 1.0 NAV 2.2
SEL
<FREEZE
NAVAIDS>
J43126AA 00
© THALES AVIONICS S.A.
AIRBUS A318/319/320/321
Summary of Contents for FMGS
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