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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 altitude bias).
FAULT MODE (FAULT)
The fault mode is entered when a failure , which may prevent the MMR from transmitting valid data
has been detected.
NORMAL OPERATION
Applicable to:
In normal operation, the GPS receiver 1 supplies ADIRU 1 and ADIRU 3, the GPS receiver 2
supplies ADIRU 2.
The GPSSU operates in different modes which are indicated on the GPS MONITOR page :
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPS - NORMAL OPERATION
A330/A340 FLEET DSC-34-15-20 P 3/4
FCOM 19 AUG 10
INITIALIZATION MODE (INIT)
When this mode is entered, the GPSSU hardware and software are initialized.
ACQUISITION MODE (ACQ)
The GPSSU 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 four satellites, then transfers to NAV mode. To
enter navigation mode more quickly, the GPSSU uses initial position, time and altitude from IRS.
NAVIGATION MODE (NAV)
When the GPSSU can track 4 or more satellites, it enters NAV mode and continuously supplies
data to the ADIRUs.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPS - NORMAL OPERATION
A330/A340 FLEET DSC-34-15-20 P 4/4
FCOM 19 AUG 10
ALTITUDE AIDING (ALTAID)
If the GPSSU 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 GPSSU enters ALTAID
mode, using the IR altitude (corrected with the altitude bias).
If, after 2 min , it has not acquired a fourth satellite, the GPSSU reverts to ACQ mode.
FAULT MODE (FAULT)
The fault mode is entered when a failure , which may prevent the GPSSU from transmitting valid
data has been detected.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPS - OPERATION IN CASE OF FAILURE
A330/A340 FLEET DSC-34-15-30 P 1/2
FCOM 19 AUG 10
OPERATION IN CASE OF FAILURE
Applicable to: ,
If one GPS receiver fails, the three ADIRUs automatically select the only operative GPS receiver. If
ADIRU 1 fails, ADIRU 3 is supplied byMMR 1, and ADIRU 2 is supplied byMMR 2. To maintain Side
1 and Side 2 segregation, in case ADIRU 2 fails, the ATT HDG selector must be set to F/O ON 3, so
that ADIRU 3 will be supplied with MMR 2 data. If two ADIRUs fail, the remaining ADIRU is supplied
by its own side GPS receiver.
OPERATION IN CASE OF FAILURE
Applicable to:
If one GPS receiver fails, the three ADIRUs automatically select the only operative GPS receiver. If
ADIRU 1 fails, ADIRU 3 is supplied by GPSSU 1, and ADIRU 2 is supplied by GPSSU 2. To maintain
Side 1 and Side 2 segregation, in case ADIRU 2 fails, the ATT HDG selector must be set to F/O ON
3, so that ADIRU 3 will be supplied with GPSSU 2 data. If two ADIRUs fail, the remaining ADIRU is
supplied by its own side GPS receiver.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPS - OPERATION IN CASE OF FAILURE
Intentionally left blank
A330/A340 FLEET DSC-34-15-30 P 2/2
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPS - WARNING AND CAUTIONS
A330/A340 FLEET DSC-34-15-40 P 1/2
FCOM 19 AUG 10
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 NIL 1, 3, 4, 10
GPS PRIMARY LOST (No ECAM warning)
TRIPLE
CLICK
During non
ILS approach
only
NIL
NIL ND/MCDU
message
2, 3, 4, 5,
8, 9, 10
WARNINGS AND CAUTIONS
Applicable to:
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPS - WARNING AND CAUTIONS
A330/A340 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
FM/GPS POS DISAGREE (If GPS PRIMARY
�� installed)
SINGLE
CHIME
MASTER
CAUTION NIL 1, 3, 4, 10
GPS PRIMARY LOST (No ECAM warning)
(If GPS PRIMARY �� installed)
　
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