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information.
ADIRS CDU
The ADIRS Control Display Unit is used as a back-up
for Inertial Reference alignment. It is also used for
mode selection, information display and status
indication.
PROBES
The Air Data input parameters, such as total and static
pressures, Angle Of Attack (AOA) and Total Air
Temperature (TAT) are sent, from the related probes
and sensors, to the three ADIRUs.
NOTE : static and total pressure are sent to the ADIRUs
via the ADMs.
FCU
The ADIRUs receive, from the Flight Control Unit (FCU),
the Baro correction set by the crew.
GPS
The Global Positioning System (GPS) provides data to
the ADIRS, mainly A/C position and speed. The ADIRS
processes the GPS data and provides pure GPS data,
pure IR data and hybrid GPS/ADIRS data to users.
DMC
The Display Management Computers (DMCs) 1 and 2 receive
their data from their related ADIRU and from ADIRU 3.
The Display Management Computer 3 (DMC3) receives
information from all three ADIRUs, to operate as a
back-up in case of DMC1 or 2 failure.
DMC/PFD & ND
ADIRU 1 and 2 display information via DMC 1 and 2, on
the corresponding Primary Flight Display (PFD) and
Navigation Display (ND).
ADIRU 3 operates as a back-up in case of ADIRU 1 or 2
failure.
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ADIRS PRESENTATION
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ADIRS PRESENTATION
ADIRS SWITCHING
Basically, ADIRU 1 is associated to the captain
instruments, ADIRU 2 to the first officer instruments
and ADIRU 3 is in standby.
In case of failure of the Air Data Reference (ADR) or
Inertial Reference (IR) function of ADIRU 1 or 2, the
affected instruments and displays may be manually
switched independently to ADIRU 3 by means of selector
switches.
USERS
The ADIRUs are directly connected to other user system.
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SELF EXAMINATION
Which ADIRU does not supply DMC 1?
A - ADIRU 1.
B - ADIRU 2.
C - ADIRU 3.
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34 - NAVIGATION
34-13-00 AIR DATA PROBES PRESENTATION
CONTENTS:
Pitot Probes
Static Ports
AOA Sensors
TAT Sensors
Water Drain
Self Examination
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AIR DATA PROBES PRESENTATION
PITOT PROBES
The total pressure is sent from the Pitot Probes to
the Air Data Modules which convert it into ARINC words
used by the Air Data Inertial Reference Units.
Three pitot probes provide total pressure to three Air
Data Modules (ADM) which convert this pressure into
digital format (ARINC 429).
ARINC words are then sent to the corresponding Air
Data Inertial Reference Unit (ADIRU). The standby pitot
probe supplies the standby Airspeed Indicator (ASI)
and ADR3 through its related ADM.
STATIC PORTS
Each Air Data Module transforms the static pressure
coming from the static ports into ARINC words.
Six static ports provide static pressure to five ADMs
which convert this pressure into digital format (ARINC
429).
The standby static ports provide an average pressure
directly to the standby instruments, and to ADR3
through a single ADM.
AOA SENSORS
Each ADIRU receives angle of attack information from
its corresponding Angle Of Attack (AOA) sensors.
The Angle Of Attack sensors are also called Alpha
probes.
TAT SENSORS
The three ADIRUs receive Total Air Temperature
　
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