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FMS DEGRADED OPERATIONS
CONTENTS 1
PART IV: FMS DEGRADED OPERATIONS
Contents
Chapter 1 - OVERVIEW....................................................1
Chapter 2 - FMGC RESETS AND FAILURES .......................1
2.1. Automatic Single Reset of one FMGC ............................1
2.2. Automatic Double Reset of one FMGC ...........................4
2.3. Automatic Triple Reset of one FMGC.............................9
2.4. Automatic Single Reset of both FMGCs .......................12
2.5. Automatic Double Reset of both FMGCs ......................14
2.6. FMS re-initilization .....................................................17
2.7. DEGRADED MODES......................................................22
 SINGLE mode ............................................................ 22
 INDEPENDENT mode................................................... 23
 Both FMGC failure....................................................... 25
2.8. MAP NOT AVAIL remains displayed on ND ..................26
Chapter 3 - MCDU ANOMALIES ........................................1
3.1. MCDU locked or blank...................................................1
3.2. FMGC (TIMEOUT)..........................................................2
Chapter 4 - OTHER DEGRADED OPERATIONS...................1
4.1. FMS erroneous predictions ...........................................1
4.2. FMS messages ..............................................................2
 FMS1/FMS2 A/C STS DIFF ............................................. 2
 FMS1/FMS2 PGM PIN DIFF............................................. 2
 UNKNOWN PROGRAM PIN..............................................2
 SENSOR IS INVALID.....................................................3
 FMS1/FMS2 POS DIFF...................................................4
 CHECK IRS1/FM POSITION ............................................5
 CHECK IRS2/FM POSITION ............................................5
 CHECK IRS3/FM POSITION ............................................5
 NAV ACCUR DOWNGRAD............................................... 6
 IR ALIGNMENT IN ATT MODE .........................................7
4.3. Weights ........................................................................8
 FMS1/FMS2 GW DIFF.................................................... 8
 CHECK GW.................................................................. 8
 INITIALIZE WEIGHTS....................................................8
AIRBUS A318/319/320/321
© THALES AVIONICS S.A.
J43126AA 00