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‐ a switching facility for selecting ADR3 or IR3 for instrument displays in case of ADIRU 1 or 2
failure.
‐ a MAG/TRUE pushbutton switch for polar navigation.
‐ AC BUS provides normal electrical supply. DC BUS provides a back up possibility through internal
inverter.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
ADIRS - DESCRIPTION
A330/A340 FLEET DSC-34-10-10 P 2/6
FCOM 19 AUG 10
GENERAL
Applicable to: ,
The Air Data and Inertial Reference System (ADIRS) supplies temperature and anemometric,
barometric and inertial parameters to the EFIS system (PFD and ND) and to other user systems
(FMGC, FADEC, PRIM, SEC, FWC, SFCC, ATC, GPWS, CMC, CPC).
The system includes :
three identical ADIRU’s (‐ Air Data and Inertial Reference Units).
Each ADIRU is divided in two parts, either of which can work separately in case of failure in the
other :
• the ADR (Air Data Reference) part which supplies barometric altitude, airspeed, Mach, angle of
attack, temperature and overspeed warnings.
• the IR (Inertial Reference) part which supplies attitude, flight path vector, track, heading,
accelerations, angular rates, ground speed and aircraft position.
Note: The ADIRU gives the true heading instead of magnetic heading :
‐ above 82 ° North
‐ above 73 ° North between 90 ° and 120 ° West (magnetic polar region)
‐ above 60 ° South
‐ one ADIRS control panel on the overhead panel for selection of modes (NAV, ATT, OFF) and
indications of failures.
‐ 2 GPS receivers, which are connected to the IR part of the ADIRU’s for GP/IR hybrid position
calculation.
‐ four types of sensors :
• pitot probes (3)
• static pressure probes (STAT) (6)
• angle of attack sensors (AOA) (3)
• total air temperature probes (TAT) (2)
These sensors are electrically heated to prevent from icing up.
‐ eight ADMs (Air Data Modules) which convert pneumatic data from pitot and static probes into
numerical data for the ADIRUs.
‐ a switching facility for selecting ADR3 or IR3 for instrument displays in case of ADIRU 1 or 2
failure.
‐ a MAG/TRUE pushbutton switch for polar navigation.
‐ AC BUS provides normal electrical supply. DC BUS provides a back up possibility through internal
inverter.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
ADIRS - DESCRIPTION
A330/A340 FLEET DSC-34-10-10 P 3/6
FCOM 19 AUG 10
PROBES LOCATION
Applicable to: ALL
PROBES SCHEMATIC
Applicable to: ALL
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
ADIRS - DESCRIPTION
A330/A340 FLEET DSC-34-10-10 P 4/6
FCOM 19 AUG 10
Note: ADIRU 1 is supplied by CAPT probes,
ADIRU 2 is supplied by F/O probes,
ADIRU 3 is supplied by STBY probes and CAPT TAT
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
ADIRS - DESCRIPTION
A330/A340 FLEET DSC-34-10-10 P 5/6
FCOM 19 AUG 10
ADIRS SCHEMATIC
Applicable to: ALL
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
ADIRS - DESCRIPTION
Intentionally left blank
A330/A340 FLEET DSC-34-10-10 P 6/6
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
ADIRS - CONTROLS AND INDICATORS
A330/A340 FLEET DSC-34-10-20 P 1/4
FCOM 19 AUG 10
OVERHEAD PANEL
Applicable to: ALL
(1) ADR 1 (2) (3) pb sw
OFF : Air data output disconnected.
FAULT lt : This amber light comes on with an ECAM caution if a fault is detected in the air
data reference part.
(2) IR 1 (2) (3) pb sw
OFF : Inertial data output disconnected.
FAULT lt : This amber light comes on with an ECAM caution when a fault affects the
respective IR.
Steady : the respective IR is lost.
Flashing : the attitude and heading information may be recovered in ATT
mode.
(3) IR 1 (2) (3) mode rotary sel
OFF : The ADIRU is not energized.
ADR and IR data are not available.
NAV : Normal mode of operation.
Supplies full inertial data to aircraft systems.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
ADIRS - CONTROLS AND INDICATORS
A330/A340 FLEET DSC-34-10-20 P 2/4
FCOM 19 AUG 10
ATT : IR mode supplying only attitude and heading information if the system loses its ability
to navigate.
The heading must be entered through the MCDU and has to be reset frequently
(about every 10 min).
(4) ON BAT lt
Comes on amber when one or more IRS is supplied only by the aircraft battery. It also comes
　
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