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determination of its position.
The aircraft has two independent GPS receivers. Each GPS receiver is integrated in a modular
avionics unit called MMR (Multi Mode Receiver) (GPS 1 receiver in MMR1, GPS2 receiver in MMR2).
The MMR processes the data received and transfers them to the ADIRUs, which then perform a
GP-IRS hybrid position calculation. The FMGCs use the hybrid position. The GPS MONITOR page
on MCDU1 or MCDU2 can display pure GPS position, true track, ground speed, estimated position,
accuracy level, and mode of operation for the flight crew's use and information.
Note: The flight crew can use the MCDU SELECTED NAVAID page to deselect the use of GPS
data for calculating position (Refer to STLO-22_20_R-50-10-20 SELECTED NAVAIDS
PAGE).
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPS - DESCRIPTION
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A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPS - NORMAL OPERATION
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NORMAL OPERATION
Applicable to:
,
,
MSN,,,,
In normal operation, the GPS receiver 1 supplies ADIRU 1 and ADIRU 3, the GPS receiver 2
supplies ADIRU 2.
The MMR operates in different modes which are indicated on the GPS MONITOR page :
INITIALIZATION MODE (INIT)
When this mode is entered, the GPS hardware and software are initialized.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPS - NORMAL OPERATION
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ACQUISITION MODE (ACQ)
The MMR enters in this mode after power-up or during long periods of lost satellite signal.
It remains in this mode until it is able to track at least 4 satellites, then transfers to NAV mode. To
enter navigation mode more quickly, MMR uses initial position, time and altitude from IRS.
NAVIGATION MODE (NAV)
When the MMR can track 4 or more satellites, it enters NAV mode and continuously supplies data
to the ADIRUs.
ALTITUDE AIDING (ALTAID)
If the MMR can track at least 4 satellites, it uses the GPS altitude and the IR altitude to calculate
an altitude bias.
If the number of satellites drops to three, the altitude bias is frozen, and the MMR enters ALTAID
mode, using the IR altitude corrected with the bias.
FAULT MODE (FAULT)
The fault mode is entered when a failure, which may prevent the MMR from transmitting valid data,
has been detected.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPS - OPERATION IN CASE OF FAILURE
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OPERATION IN CASE OF FAILURE
Applicable to:
,
,
MSN,,,,
If one GPS receiver fails, the three ADIRUs automatically select the only operative GPS receiver.
If ADIRU 1 fails, ADIRU 3 is supplied by MMR 1, and ADIRU 2 by MMR 2.
In order to maintain Side 1 and Side 2 segregation, in case ADIRU 2 fails, the ATT HDG selector has
to be set to F/O 3, so that ADIRU 3 will be supplied with MMR 2 data.
If 2 ADIRUs fail, the remaining ADIRU is supplied by its own side GPS receiver.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPS - OPERATION IN CASE OF FAILURE
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A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPS - WARNINGS AND CAUTIONS
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WARNINGS AND CAUTIONS
Applicable to:
E/WD : FAILURE TITLE
conditions
AURAL
WARNING
MASTER
LIGHT
SD PAGE
CALLED
LOCAL
WARNING
FLT PHASE
INHIB
GPS 1 (2) FAULT 4, 5, 7, 8
FM/GPS POS DISAGREE
SINGLE
CHIME
MASTER
CAUTION 1, 10
GPS PRIMARY LOST
(No ECAM warning)
TRIPLE
CLICK During
non ILS
approach only
NIL
NIL NIL 2, 3, 4, 5,
8, 9, 10
WARNINGS AND CAUTIONS
Applicable to:
,
,
MSN,,,
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPS - WARNINGS AND CAUTIONS
A318/A319/A320/A321 FLEET DSC-34-15-40 P 2/2
FCOM 19 AUG 10
E/WD : FAILURE TITLE
conditions
AURAL
WARNING
MASTER
LIGHT
SD PAGE
CALLED
LOCAL
WARNING
FLT PHASE
INHIB
GPS 1 (2) FAULT 4, 5, 7, 8
　
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