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The Flight Management part of the FMGC performs four main functions
- Navigation
- Flight planning (lateral and vertical)
- Prediction and optimization of performance
- Management of the displays (MCDU, ND, PFD).
Essential navigation functions are :
- Computation of position.
- Evaluation of position accuracy (also see FCOM Vol 4 for a detailed description of pilot's
   procedure).
- Radio navigation tuning.
- Alignment of Inertial Reference System.
CCM ALL
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┃                                ┃                            ┃1.22.20     P 2       ┃
┃                                ┃                            ┣━━━━━┳━━━━━┫
┃I  ~-~ A318                     ┃I         FLIGHTFMANAGEMENT ┃SEQ 110 1 ┃I REV 32  ┃
┃ aw aw ,, ~L,~ A319             ┃                            ┃          ┃          ┃
┃ Lli,~ A320                     ┃                            ┃          ┃          ┃
┃      A~7-~'M" A321             ┃                            ┃          ┃          ┃
┃   FLIGHT CREW OPERATING MANUAL ┃                            ┃          ┃          ┃
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POSITION COMPUTATION
Each FMGC computes its own aircraft position (called the "FM position") from a MIX IRS
position (see below), and a computed radio position or GPS position.
The FMGS selects the most accurate position, considering the estimated accuracy and
integrity of each positioning equipment.
GPS/INERTIAL is the basic navigation mode,
tested. Otherwise, navaids plus inertial or
modes).
MIX IRS POSITION
provided GPS data is valid and successfully
nertial only are used. (Refer to Navigation
Each FMGC receives a position from each of the three IRSs, and computes a
mean-weighted average called the "MIX IRS" position.
IRS 2
IRS I     MIX IRS     IRS 3
If one of the IRSs drifts abnormally, the MIX IRS position uses an algorithm that
decreases the influence of the drifting IRS within the MIX IRS position.
IR
IRS 2
MIX IRS
IRS 3
If one of the IRSs fails, each FMGC uses only one IRS (onside IRS or IRS3). Each IRS
position and inertial speed are continuously tested. If the test fails, the corresponding
IRS is rejected.
When the MIX IRS position differs from the radio position by more than 12 NM, the
"CHECK A/C POSITION" message is displayed on the MCDUs.
CCM ALL
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┃J  ~-2 A318                     ┃    AUTO FLIGHT   ┃1.22.20     P 3       ┃
　
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