AIR DATA/INERTIAL REFERENCE SYSTEM (ADIRU & CDU OR MSU) - DESCRIPTION AND OPERATION

** ON A/C NOT FOR ALL

1. General
The Air Data/Inertial Reference System (ADIRS) provides the main air data and heading/attitude/navigation data to the aircraft systems.
The main computers of the ADIRS are the three Air Data/Inertial Reference Units (ADIRU) which are controlled by the ADIRS Control and Display Unit (CDU).
The ADIRS is a three channel system. Each channel is isolated from the others and provides independent information as defined in ARINC 738.
Each ADIRU contains:

an Air Data Reference (ADR) portion. Its operation is described in 34-13
an Inertial Reference (IR) portion. Its operation is described in 34-14.
Power supply is common for ADR and IR and described in 34-11.

The Air Data/Inertial Reference System (ADIRS) provides the main air data and heading/attitude/navigation data to the aircraft systems.
The main computers of the ADIRS are the three Air Data/Inertial Reference Units (ADIRU) which are controlled by the ADIRS Mode Selector Unit (MSU).
The ADIRS is a three-channel system. Each channel is isolated from the others and provides independent information as defined in ARINC 738.
Each ADIRU contains:

An Air Data Reference (ADR) portion. Its operation is described in 34-13.
An Inertial Reference (IR) portion. Its operation is described in 34-14.
The power supply is common for the ADR and IR and described in 34-11.

** ON A/C NOT FOR ALL

2. Component Location

ADIRS - Component Location ** ON A/C NOT FOR ALL

ADIRS CDU - Component Location ** ON A/C NOT FOR ALL

The three ADIRUs are installed in the avionics compartment.
The ADIRS CDU is installed in the cockpit.

ADIRS - Component Location ** ON A/C NOT FOR ALL

ADIRS MSU - Component Location ** ON A/C NOT FOR ALL

The three ADIRUs are installed in the avionics compartment.
The ADIRS MSU is installed in the cockpit.

FIN	FUNCTIONAL DESIGNATION	PANEL	ZONE	ATA REF
** ON A/C NOT FOR ALL
1FP1	ADIRU-1		127	34-12-34
1FP2	ADIRU-2		128	34-12-34
1FP3	ADIRU-3		120	34-12-34
** ON A/C NOT FOR ALL
2FP	CDU-ADIRS	20VU	210	34-12-12

** ON A/C NOT FOR ALL

3. Interface

A. Mechanical Interface
The ADIRUs are installed and aligned on a specific mounting tray in the avionics compartment in accordance with the installation design defined in ARINC 738. The ADIRU is to 4 MCU size. In order to ensure attitude and azimuth accuracy, the mounting tray orientation complies with the following tolerances:

pitch and roll: plus or minus 12 minutes
azimuth: plus or minus 12 minutes.

B. Electrical Interface

(1) ADIRS CDU - General

ADIRS CDU - Electrical Interface ** ON A/C NOT FOR ALL

The ADIRS CDU contains three identical connectors. Each connector is linked to one ADIRU by means of an insert position keying.
The four annunciator discretes ADR OFF, ADR FAULT, IR ALIGN and IR FAULT are linked to the ADIRS CDU from the ADIRU, through the annunciator light test and interface boards.
The CDU panel lighting and LCD backlighting are provided by bulbs supplied with 5VAC (from the A/C electrical generation).
The CDU exchanges data with the ADIRU.
The data sent by the CDU can be used for the initialization of the IR portion. The data received by the CDU are displayed on the Liquid Crystal Display (LCD).

(2) ADIRS MSU - General

ADIRS MSU - Electrical Interface ** ON A/C NOT FOR ALL

The ADIRS MSU contains three identical connectors. Each connector is linked to one ADIRU by means of an insert position keying.
The four annunciator discretes ADR OFF, ADR FAULT, IR OFF and IR FAULT are linked to the ADIRS MSU from the ADIRU, through the annunciator light test and interface boards.

(3) ADIRS CDU - Digital Form
The tables below contain all the output parameters in the digital form.
They are sorted as per the numerical order of their output label.
The following tables give:

EQ.SYS.LAB.SDI: (SDAC, FWC, DMC...) output label for which the parameter is available
PARAMETER DEFINITION: parameter name
WORD RANGE/OPER RANGE/RESOLUTION ACCURACY: measurement range Maximum value transmitted. When the digital value changes, the change step is equal to the accuracy
UNIT: unit in which the digital value is transmitted
SIG BIT: indicates whether a sign bit is available
BITS: number of bits used by the parameter in the label
XMSN/INTV: output transmission interval. The refresh rate is given in milliseconds.
CODE:
BNR: binary data word
BCD: binary coded decimal data word
ISO: data word coded in ISO5 code
DIS: discrete data word
HEX: hexadecimal coded
HYB: mixed code.
ALPHA CODE: indicates the parameter mnemonic code
SOURCE ORIGIN: parameter source computer or system.

(a) CDU bus inputs
The CDU receives an ARINC 429 High Speed bus from the IR portion of each ADIRU.

-------------------------------------------------------------------------------

| PARAMETER LIST PARAMETER CHARACTERISTICS (NUMERIC) |

-------------------------------------------------------------------------------

-------------------------------------------------------------------------------

! 010 !PRESENT !90S-90N !DEG ! ! 6 ! ! BCD! !

! !POS LAT-D !(POSITIVE: !& ! ! ! ! ! !

! ! !NORTH FROM !MIN ! ! ! ! ! !

! ! !0 DEG) ! ! ! ! ! ! !

! ! !RESOL = .1 ! ! ! ! ! ! !

!-----------------------------------------------------------------------------!

! 011 !PRESENT !180E-180W !DEG ! ! 6 ! ! BCD! !

! !POS LONG-D !(POSITIVE: !& ! ! ! ! ! !

! ! !EAST FROM !MIN ! ! ! ! ! !

! ! !0 DEG) ! ! ! ! ! ! !

! ! !RESOL = .1 ! ! ! ! ! ! !

!--------------!-----------!-----------!----!---!----!----!----!--------------!

! 012 !GROUND !0-2000 !Kt ! ! 4 ! ! BCD! !

! !SPEED-D !(ALWAYS ! ! ! ! ! ! !

! ! !POSITIVE) ! ! ! ! ! ! !

! ! !RESOL = 1 ! ! ! ! ! ! !

!--------------!-----------!-----------!----!---!----!----!----!--------------!

! 013 !TRACK !0-359.9 !DEG ! ! 4 ! ! BCD! !

! !ANGLE TRUE !(POSITIVE: ! ! ! ! ! ! !

! ! !CW FROM ! ! ! ! ! ! !

! ! !NORTH) ! ! ! ! ! ! !

! ! !RESOL = .1 ! ! ! ! ! ! !

!--------------!-----------!-----------!----!---!----!----!----!--------------!

! 014 !MAGNETIC !0-359.9 !DEG ! ! 4 ! ! BCD! !

! !HEADING !(POSITIVE: ! ! ! ! ! ! !

! ! !CW FROM ! ! ! ! ! ! !

! ! !NORTH) ! ! ! ! ! ! !

! ! !RESOL = .1 ! ! ! ! ! ! !

!--------------!-----------!-----------!----!---!----!----!----!--------------!

! 015 !WIND SPEED !0-256 !Kt ! ! 3 ! ! BCD! !

! ! !(ALWAYS ! ! ! ! ! ! !

! ! !POSITIVE) ! ! ! ! ! ! !

! ! !RESOL = 1 ! ! ! ! ! ! !

!--------------!-----------!-----------!----!---!----!----!----!--------------!

! 016 !WIND DIR !0-359 !DEG ! ! 3 ! ! BCD! !

! !TRUE !(POSITIVE: ! ! ! ! ! ! !

! ! !CW FROM ! ! ! ! ! ! !

! ! !NORTH) ! ! ! ! ! ! !

! ! !RESOL = 1 ! ! ! ! ! ! !

!--------------!-----------!-----------!----!---!----!----!----!--------------!

! 044 !TRUE !0-359.9 !DEG ! ! 4 ! ! BCD! !

! !HEADING !(POSITIVE: ! ! ! ! ! ! !

! ! !CW FROM ! ! ! ! ! ! !

! ! !NORTH) ! ! ! ! ! ! !

! ! !RESOL = .1 ! ! ! ! ! ! !

!--------------!-----------!-----------!----!---!----!----!----!--------------!

! 270 !IR DISCRETE! ! ! ! 19 ! ! DIS! !

! !(1) ! ! ! ! ! ! ! !

!--------------!-----------!-----------!----!---!----!----!----!--------------!

! 277 !CDU TEST ! ! ! ! 18 ! ! DIS! !

! !WORD (1) ! ! ! ! ! ! ! !

!--------------!-----------!-----------!----!---!----!----!----!--------------!

! 350 !ACTION ! ! ! ! 19 ! ! DIS! !

! !CODE (1) ! ! ! ! ! ! ! !

-------------------------------------------------------------------------------

CDU IR Input Labels

NOTE: (1) The complete definition of the labels 270, 277 and 350 is detailed in 34-14-00 Para. 2.D.(1).

(b) CDU bus outputs
The CDU sends the parameters detailed in the following table to the IR portion of each ADIRU:

-------------------------------------------------------------------------------

| PARAMETER LIST PARAMETER CHARACTERISTICS (NUMERIC) |

-------------------------------------------------------------------------------

-------------------------------------------------------------------------------

! 041 !SET ! 90S-90N !DEG ! ! 6 ! ! BCD! !

! !LATITUDE ! (POSITIVE: !& ! ! ! ! ! !

! ! ! NORTH) !MIN ! ! ! ! ! !

! ! ! RESOL = 0.1! ! ! ! ! ! !

!--------------!----------!------------!----!----!----!----!----!-------------!

! 042 !SET ! 180E-180W !DEG ! ! 6 ! ! BCD! !

! !LONGITUDE ! (POSITIVE: !& ! ! ! ! ! !

! ! ! EAST) !MIN ! ! ! ! ! !

! ! ! RESOL = 0.1! ! ! ! ! ! !

!--------------!----------! -----------!----!----!----!----!----!-------------!

! 043 !SET ! 0-359 !DEG ! ! 3 ! ! BCD! !

! !MAGNETIC ! (POSITIVE: ! ! ! ! ! ! !

! !HDG ! CW FROM N) ! ! ! ! ! ! !

! ! ! RESOL = 1 ! ! ! ! ! ! !

!--------------!----------!------------!----!----!----!----!----!-------------!

! 277 !CDU TEST ! ! ! ! 19 ! ! DIS! !

-------------------------------------------------------------------------------

CDU Output Labels

(4) ADIRU - General
The ADIRU receives data and computes outputs in accordance with ARINC 738. It uses an ARINC 600 type 2 floating-connector.

(5) ADIRU - Digital inputs

Air Data Module (ADM) inputs
The ADR provides up to five ADM input buses. Only three of them are used to receive air mass data from remotely mounted ADM (Ref. 34-11), two linked to the static probe and one linked to the pitot probe.

NOTE: For the ADIRU 3, only two ADM input buses are used: one for the total pressure data and the other for the averaged static pressure data.

digital baro-correction inputs
The ADR provides two baro-correction digital data input ports. The incoming data from the Flight Control Unit (FCU) are in ARINC 429 low speed format.
The ADR receives data from baro-correction bus A.
The baro-correction is used to compensate baro-corrected altitude output.
initialization data inputs
The IR portion of the ADIRU receives data from either ARINC 702 Flight Management and Guidance Computer (FMGC). The data are in ARINC 429 low speed format. The initialization parameters are latitude and longitude or magnetic heading.
CFDIU input
The ADIRU provides one Centralized Fault Display Interface Unit (CFDIU) input bus. The data are in ARINC 429 low speed format.
The CFDIU continuously transmits data to all systems. The ADIRU uses these data to accept commands from the CFDIU.
Air Data Reference inputs
The IR portion of the ADIRU provides two digital data input ports for receiving data from the other ADIRUs.
The incoming data are in ARINC 429 low speed format and include altitude and true airspeed.
CDU inputs
The IR portion of the ADIRU receives data from one ARINC 738 CDU. The data are in ARINC 429 low speed format. These data are initialization parameters (latitude and longitude or magnetic heading) and CDU status.
GPS inputs
The IR portion of the ADIRU receives data from the GPS portion of the Multi-Mode Receivers (MMRs).
The data are in ARINC 429 high speed format. These data concern various parameters such as position, velocity, and integrity.
the ADIRU provides provision for digital input buses.

(6) ADIRU - General
The ADIRU receives data and computes outputs in accordance with ARINC 738. It uses an ARINC 600 type-2 floating-connector.

(7) ADIRU - Digital inputs

Air Data Module (ADM) inputs
The ADR provides up to five ADM input buses. Only three of them are used to receive air mass data from remotely-mounted ADM (Ref. 34-11), two linked to the static probe and one linked to the pitot probe.

NOTE: For the ADIRU 3, only two ADM input buses are used: one for the total pressure data and the other one for the averaged static pressure data.

Digital baro-correction inputs
The ADR provides two baro-correction digital data input ports. The data incoming from the Flight Control Unit (FCU) is in ARINC 429 low-speed format.
The ADR receives data from baro-correction bus A.
The baro-correction is used to compensate baro-corrected altitude output.
Initialization data inputs
The IR portion of the ADIRU receives data from either ARINC 702 Flight Management and Guidance Computer (FMGC). The data is in ARINC 429 low-speed format. The initialization parameters are latitude and longitude or magnetic heading.
CFDIU input
The ADIRU provides one Centralized Fault Display Interface Unit (CFDIU) input bus. The data is in ARINC 429 low-speed format.
The CFDIU continuously transmits data to all systems. The ADIRU uses this data to accept commands from the CFDIU.
Air Data Reference inputs
The IR portion of the ADIRU provides two digital data input ports for receiving data from the other ADIRUs.
The incoming data are in ARINC 429 low-speed format and includes altitude and true airspeed.
GPS inputs
The IR portion of the ADIRU receives data from the GPS portion of the Multi-Mode Receivers (MMRs).
The data is in ARINC 429 high-speed format. This data is related to various parameters such as position, velocity and integrity.
The ADIRU has provision for digital input buses.

(8) ADIRU - Analog inputs

analog AOA input
The ADR portion of the ADIRU accepts two resolver inputs of indicated angle of attack.
The characteristics of the resolvers, as seen by the ADR, are as follows:
. scale factor: 1°/Degree of AOA
. index reference: 0° resolver input = 25° AOA
Total Air Temperature (TAT) sensor
The ADR portion of the ADIRU accepts a standard 500 ohm platinum sensing element input from the TAT sensor.
The ADR derives the measured temperature from the TAT sensor input using the Callender-Van Dusen equation from ARINC 738.
GPS Time Mark inputs
This allows the ADIRU to be synchronized with the GPS portion of the MMRs.
115VAC
The ADIRU operates from the 115VAC/400 Hz primary power.
28VDC back-up
The ADIRU can operate from the 28VDC back-up power.
26VAC reference
The ADIRU accepts up to three 26VAC resolver reference inputs. Only one is used for the AOA resolver.

The ADIRU provides provisions for analog inputs (two 26VAC reference inputs, and three analog baro-correction inputs are reserved).

(9) ADIRU - Discrete inputs
These inputs are generally pin programs except for:

Static Source Error Correction (SSEC) and AOA correction and selection discretes which come from the Slat and Flap Control Computers (SFCC) and are linked to flap position
ADIRS - ADIRUs/SFCCs Interface ** ON A/C NOT FOR ALL
heat discretes which come from the associated Probe Heat Computer (PHC)
VMO/MMO discrete provided by the position of the L/G DOWN VMO/MMO SELECTION switch (22FP).
ADR selection:
It indicates, to the IR, the air data source to be used.
CDU ON/OFF:
It indicates, to the ADIRU, whether the ADIRU data are currently displayed on the CDU.
ADR OFF:
It indicates, to the ADIRU, that the crew has pushed the ADR pushbutton switch on the ADIRS CDU. This commands the ADIRU to stop the transmission of the ADR output buses.
IR MODE SELECT:
It indicates, to the ADIRU, the position of the associated selector switch on the CDU. Three positions can be coded: OFF, NAV, ATT. This gives the computer operating mode.

(10) ADIRU - Pin program discrete functions
The functions of the pin program discretes are:

aircraft identification:
seven discretes provide the ADIRU with the identification of the aircraft.
They are used by the ADR to select the appropriate SSEC and AOA correction laws and by the IR to select the appropriate filtering (bandwidth) of the output labels.
baro-correction source selection:
This discrete provides the ADIRU with the following:
. the form (digital or analog) in which the baro-correction transmission is made
. the number of sources (2 or 3)
. the type of transmission used by the digital sources (single bus or various buses).
On the A/C, the FCU transmits the CAPT and F/O baro-correction in digital form on separate buses.
AOA average/unique:
The ADIRU receives the AOA on two resolvers.
This discrete indicates whether the computation must use an average value from the two resolvers or the value of resolver 1 in priority with the second as a back-up in case of failure. This last solution is chosen on the A/C.
ADR ARINC the filter select:
Unused (the selection of the ADR outputs filtering is done by the A/C ident pin programming).
mounting position:
This indicates the orientation of the unit to the IR portion. It is used to know where are the longitudinal and lateral axes of the aircraft and the sign of motion measured.
SDI:
This indicates on which side (CAPT, F/O, Standby) the ADIRU is installed.
CMC-CFDS message select:
The ADIRU could be installed on other A/C version. In this case, the ADIRU selects a table of maintenance messages with a different syntax.

(11) ADIRU - Discrete inputs
These inputs are generally pin programs except for:

Static Source Error Correction (SSEC) and AOA correction and selection discretes which come from the Slat and Flap Control Computers (SFCC) and are linked to flap position
ADIRS - ADIRUs/SFCCs Interface ** ON A/C NOT FOR ALL
heat discretes which come from the associated Probe Heat Computer (PHC)
VMO/MMO discrete provided by the position of the L/G DOWN VMO/MMO SELECTION switch (22FP).
ADR selection:
It indicates, to the IR, the air data source to be used.
ADR OFF, IR OFF:
It indicates, to the ADIRU, that the crew has pushed the ADR pushbutton switch on the ADIRS MSU. This commands the ADIRU to stop the transmission of the ADR output buses.
IR MODE SELECT:
It indicates, to the ADIRU, the position of the associated selector switch on the MSU. Three positions can be coded: OFF, NAV, ATT. This gives the computer operating mode.

(12) ADIRU - Pin program discrete functions
The functions of the pin program discretes are:

aircraft identification:
seven discretes provide the ADIRU with the identification of the aircraft.
They are used by the ADR to select the appropriate SSEC and AOA correction laws and by the IR to select the appropriate filtering (bandwidth) of the output labels.
baro-correction source selection:
This discrete provides the ADIRU with the following:
. the form (digital or analog) in which the baro-correction transmission is made
. the number of sources (2 or 3)
. the type of transmission used by the digital sources (single bus or various buses).
On the A/C, the FCU transmits the CAPT and F/O baro-correction in digital form on separate buses.
AOA average/unique:
The ADIRU receives the AOA on two resolvers.
This discrete indicates whether the computation must use an average value from the two resolvers or the value of resolver 1 in priority with the second as a back-up in case of failure. This last solution is chosen on the A/C.
ADR ARINC the filter select:
Unused (the selection of the ADR outputs filtering is done by the A/C ident pin programming).
mounting position:
This indicates the orientation of the unit to the IR portion. It is used to know where are the longitudinal and lateral axes of the aircraft and the sign of motion measured.
SDI:
This indicates on which side (CAPT, F/O, Standby) the ADIRU is installed.
CMC-CFDS message select:
The ADIRU could be installed on other A/C version. In this case, the ADIRU selects a table of maintenance messages with a different syntax.

(13) ADIRU - Pin program discrete functions - GPS sensor present
This indicates, to the ADIRU, the presence on-board the aircraft of one or two MMRs (GPS portion).

(14) ADIRU - Pin program discrete functions - GPS priority select
This indicates, to the ADIRU, the priority for using the MMRs (GPS portion).

(15) ADIRU - Pin program discrete functions - Mag. Var. select
This discrete selects between two different magnetic variation tables:
* one standard coverage model optimized for year 2005 and one expanded coverage model optimized for year 2010.

(16) ADIRU - Pin program discrete functions - Mag. Var. select
This discrete selects between two different magnetic variation tables:
* one standard coverage model optimized for year 2010 and one expanded coverage model optimized for year 2015.

(17) ADIRU - Digital outputs

The ADR portion of the ADIRU provides eight identical ARINC 429 Low Speed buses. Two of these buses are dedicated to the interface with the Electronic Control Units (ECU).
The number of these buses is 5 and 6.
The system users are described in the table below:

----------------------------------------------------------------------------

! USERS ! ADR 1 BUS ! ADR 2 BUS ! ADR 3 BUS !

! !-----------------!-----------------!-----------------!

! !1 !2 !3 !4 !5 !6 !1 !2 !3 !4 !5 !6 !1 !2 !3 !4 !5 !6 !

!--------------------------------------------------------------------------!

!ADIRU 1 ! ! ! ! ! ! ! ! !* ! ! ! ! ! !* ! ! ! !

!--------------------!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!

!ADIRU 2 ! !* ! ! ! ! ! ! ! ! ! ! ! !* ! ! ! ! !

!--------------------!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!

!ADIRU 3 ! ! !* ! ! ! ! ! ! !* ! ! ! ! ! ! ! ! !

!--------------------!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!

!FMGC 1 ! ! !* ! ! ! ! ! !* ! ! ! ! ! !* ! ! ! !

!--------------------!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!

!FMGC 2 ! !* ! ! ! ! ! !* ! ! ! ! ! !* ! ! ! ! !

!--------------------!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!

!DMC 1 !* ! ! ! ! ! ! ! ! ! ! ! ! ! !* ! ! ! !

!--------------------!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!

!DMC 2 ! ! ! ! ! ! !* ! ! ! ! ! ! !* ! ! ! ! !

!--------------------!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!

!DMC 3 ! ! !* ! ! ! ! ! !* ! ! ! !* ! ! ! ! ! !

!--------------------!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!

!WR 1 ! ! ! !* ! ! ! ! ! ! ! ! ! ! ! !* ! ! !

!--------------------!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!

!WR 2 (1)! ! ! ! ! ! ! ! ! !* ! ! ! ! ! !* ! ! !

!--------------------!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!

!ATC 1 ! ! ! !* ! ! ! ! ! ! ! ! ! ! ! !* ! ! !

!--------------------!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!

!ATC 2 ! ! ! ! ! ! ! !* ! ! ! ! ! !* ! ! ! ! !

!--------------------!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!

!FWC 1 ! ! !* ! ! ! ! ! !* ! ! ! ! ! !* ! ! ! !

!--------------------!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!

!FWC 2 ! !* ! ! ! ! ! !* ! ! ! ! ! !* ! ! ! ! !

!--------------------!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!

!CFDIU ! ! ! !* ! ! ! ! ! !* ! ! ! ! ! !* ! ! !

!--------------------!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!

!ECU or EEC ENG 1 ! ! ! ! !* ! ! ! ! ! !* ! ! ! ! ! ! ! !

!--------------------!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!

!ECU or EEC ENG 2 ! ! ! ! ! !* ! ! ! ! ! !* ! ! ! ! ! ! !

!--------------------!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!

!SFCC 1 ! ! !* ! ! ! ! ! !* ! ! ! ! ! ! ! ! ! !

!--------------------!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!

!SFCC 2 ! !* ! ! ! ! ! !* ! ! ! ! ! ! ! ! ! ! !

!--------------------!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!

!FAC 1 ! ! !* ! ! ! ! ! !* ! ! ! ! ! !* ! ! ! !

!--------------------!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!

!FAC 2 ! !* ! ! ! ! ! !* ! ! ! ! ! !* ! ! ! ! !

!--------------------!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!

!ELAC 1 ! ! !* ! ! ! ! ! !* ! ! ! ! ! !* ! ! ! !

!--------------------!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!

!ELAC 2 ! !* ! ! ! ! ! !* ! ! ! ! ! !* ! ! ! ! !

!--------------------!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!

!SEC 1 ! ! !* ! ! ! ! ! ! ! ! ! ! ! !* ! ! ! !

!--------------------!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!

!SEC 2 ! !* ! ! ! ! ! !* ! ! ! ! ! ! ! ! ! ! !

!--------------------!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!

!SEC 3 ! ! ! ! ! ! ! !* ! ! ! ! ! !* ! ! ! ! !

!--------------------!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!

!AOA CAPT INDIC. (1)! ! ! !* ! ! ! ! ! ! ! ! ! ! ! ! ! ! !

!--------------------!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!

!AOA F/O INDIC. (1)! ! ! ! ! ! ! ! ! !* ! ! ! ! ! ! ! ! !

!--------------------!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!

!GPWC (1)! ! ! !* ! ! ! ! ! ! ! ! ! ! ! ! ! ! !

!--------------------!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!

!DMU (1)! !* ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !

!--------------------!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!

!CABIN PRESSURE ! ! !* ! ! ! ! ! ! !* ! ! ! ! !* ! ! ! !

!CONTROLLER1 ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !

!--------------------!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!

!CABIN PRESSURE ! ! ! !* ! ! ! !* ! ! ! ! ! ! ! !* ! ! !

!CONTROLLER2 ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !

!--------------------!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!

!ZONE TEMPERATURE ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !* ! ! !

!CONTROLLER ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !

!--------------------!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!

!TEST 1 CONNECTORS ! ! ! !* ! ! ! ! ! !* ! ! ! ! ! !* ! ! !

----------------------------------------------------------------------------

(1) Optional system

Table 11 : ADR Data Users

(18) ADIRU - IR Portion - System users table

The IR portion of the ADIRU provides four identical ARINC 429 High Speed buses. The system users are described in the table below:

-------------------------------------------------------------------------

! USERS ! IR 1 BUS ! IR 2 BUS ! IR 3 BUS !

! !-------------------!-------------------!-------------------!

! ! 1 ! 2 ! 3 ! 4 ! 1 ! 2 ! 3 ! 4 ! 1 ! 2 ! 3 ! 4 !

!-----------------------------------------------------------------------!

!FAC 1 ! ! ! * ! ! ! ! * ! ! ! ! * ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!FAC 2 ! ! * ! ! ! ! * ! ! ! ! * ! ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!ELAC 1 ! ! ! * ! ! ! ! * ! ! ! ! * ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!ELAC 2 ! ! * ! ! ! ! * ! ! ! ! * ! ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!SEC 1 ! ! ! * ! ! ! ! ! ! ! ! * ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!SEC 2 ! ! * ! ! ! ! * ! ! ! ! ! ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!SEC 3 ! ! ! ! ! ! * ! ! ! ! * ! ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!DMC 1 ! * ! ! ! ! ! ! ! ! ! ! * ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!DMC 2 ! ! ! ! ! ! * ! ! ! ! * ! ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!DMC 3 ! ! ! * ! ! ! ! * ! ! * ! ! ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!CDU ! ! * ! ! ! ! * ! ! ! ! * ! ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!FMGC 1 ! ! ! * ! ! ! ! * ! ! ! ! * ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!FMGC 2 ! ! * ! ! ! ! * ! ! ! ! * ! ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!FQIC ! ! * ! ! ! ! * ! ! ! ! ! ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!BSCU ! ! * ! ! ! ! ! * ! ! ! * ! ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!CFDIU ! ! ! * ! ! ! ! * ! ! ! ! * ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!GPWC (1)! ! ! * ! ! ! ! ! ! ! ! ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!WR 1 ! ! ! * ! ! ! ! ! ! ! ! * ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!WR 2 (1)! ! ! ! ! ! * ! ! ! ! ! ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!TCAS (1)! ! ! ! ! ! ! ! ! ! ! ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!DMU (1)! ! * ! ! ! ! ! * ! ! ! ! ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!GPS 1 (1)! ! * ! ! ! ! ! ! ! ! ! * ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!GPS 2 (1)! ! ! ! ! * ! ! ! ! ! ! * ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!MMR 1 (1)! ! * ! ! ! ! ! * ! ! ! ! * ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!MMR 2 (1)! ! ! * ! ! ! * ! ! ! ! ! * ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!SDU ! ! ! ! ! ! ! ! ! ! ! ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!RMI-VOR/DME! ! * ! ! ! ! ! ! ! ! * ! ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!RMI-ADF (1)! ! ! * ! ! ! ! ! ! ! ! * ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!TEST PLUG ! ! ! * ! ! ! * ! ! ! ! ! * ! !

-------------------------------------------------------------------------

(1) Optional system

Table 12 : IR Data Users - Basic version

(19) ADIRU - IR Portion - System users table

The IR portion of the ADIRU provides four identical ARINC 429 high-speed buses. The system users are described in the table below:

-------------------------------------------------------------------------

! USERS ! IR 1 BUS ! IR 2 BUS ! IR 3 BUS !

! !-------------------!-------------------!-------------------!

! ! 1 ! 2 ! 3 ! 4 ! 1 ! 2 ! 3 ! 4 ! 1 ! 2 ! 3 ! 4 !

!-----------------------------------------------------------------------!

!FAC 1 ! ! ! * ! ! ! ! * ! ! ! ! * ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!FAC 2 ! ! * ! ! ! ! * ! ! ! ! * ! ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!ELAC 1 ! ! ! * ! ! ! ! * ! ! ! ! * ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!ELAC 2 ! ! * ! ! ! ! * ! ! ! ! * ! ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!SEC 1 ! ! ! * ! ! ! ! ! ! ! ! * ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!SEC 2 ! ! * ! ! ! ! * ! ! ! ! ! ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!SEC 3 ! ! ! ! ! ! * ! ! ! ! * ! ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!DMC 1 ! * ! ! ! ! ! ! ! ! ! ! * ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!DMC 2 ! ! ! ! ! ! * ! ! ! ! * ! ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!DMC 3 ! ! ! * ! ! ! ! * ! ! * ! ! ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!FMGC 1 ! ! ! * ! ! ! ! * ! ! ! ! * ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!FMGC 2 ! ! * ! ! ! ! * ! ! ! ! * ! ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!FQIC ! ! * ! ! ! ! * ! ! ! ! ! ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!BSCU ! ! * ! ! ! ! ! * ! ! ! * ! ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!CFDIU ! ! ! * ! ! ! ! * ! ! ! ! * ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!GPWC (1)! ! ! * ! ! ! ! ! ! ! ! ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!WR 1 ! ! ! * ! ! ! ! ! ! ! ! * ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!WR 2 (1)! ! ! ! ! ! * ! ! ! ! ! ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!TCAS (1)! ! ! ! ! ! ! ! ! ! ! ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!DMU (1)! ! * ! ! ! ! ! * ! ! ! ! ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!GPS 1 (1)! ! * ! ! ! ! ! ! ! ! ! * ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!GPS 2 (1)! ! ! ! ! * ! ! ! ! ! ! * ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!MMR 1 (1)! ! * ! ! ! ! ! * ! ! ! ! * ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!MMR 2 (1)! ! ! * ! ! ! * ! ! ! ! ! * ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!SDU ! ! ! ! ! ! ! ! ! ! ! ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!RMI-VOR/DME! ! * ! ! ! ! ! ! ! ! * ! ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!RMI-ADF (1)! ! ! * ! ! ! ! ! ! ! ! * ! !

!-----------!----!----!----!----!----!----!----!----!----!----!----!----!

!TEST PLUG ! ! ! * ! ! ! * ! ! ! ! ! * ! !

-------------------------------------------------------------------------

(1) Optional system

Table 12 : IR Data Users - Basic version

(20) ADIRU - Analog outputs
The ADIRUs, through analog outputs, supply the ADMs with +13.5/-13.5VDC and the CDU with 28VDC.

(21) ADIRU - Analog outputs
The ADIRUs, through analog outputs, supply the ADMs with +13.5/-13.5 VDC.

(22) ADIRU - Discrete outputs
The discrete outputs are either open/ground or open/28VDC discretes (for ON BAT, IR FAILURE WARNING and ALIGN NOT READY discretes). The LOW SPEED WARNING discretes are set according to a speed threshold (with an hysteresis of 4 knots). These thresholds are respectively:

---------------------------------

!Lower threshold!Upper threshold!

! value ! value !

--------------------------!---------------!---------------!

! LOW SPEED WARNING 1 ! 100 ! 104 !

! LOW SPEED WARNING 2 ! 50 ! 54 !

! LOW SPEED WARNING 3 ! 155 ! 159 !

! LOW SPEED WARNING 4 ! 260 ! 264 !

-----------------------------------------------------------

The LOW SPEED WARNING 1 discrete is used in the Ram Air Turbine extension logic and in the power generation logic. The LOW SPEED WARNING 2 discrete is used in the power generation logic.
The following discretes are used to control the CDU annunciators:

ON BAT
ADR OFF
ADR FAILURE WARNING
IR FAILURE WARNING
IR ALIGN.

(23) ADIRU - Discrete outputs
The discrete outputs are either open/ground or open/28 VDC discretes (for ON BAT, IR FAILURE WARNING and IR OFF discretes). The LOW SPEED WARNING discretes are set according to a speed threshold (with a hysteresis of 4 knots). These thresholds are respectively:

---------------------------------

!Lower threshold!Upper threshold!

! value ! value !

--------------------------!---------------!---------------!

! LOW SPEED WARNING 1 ! 100 ! 104 !

! LOW SPEED WARNING 2 ! 50 ! 54 !

! LOW SPEED WARNING 3 ! 155 ! 159 !

! LOW SPEED WARNING 4 ! 260 ! 264 !

-----------------------------------------------------------

ON BAT
ADR OFF
IR OFF
ADR FAILURE WARNING
IR FAILURE WARNING.

** ON A/C NOT FOR ALL

4. Component Description

A. ADIRS Control Unit FIN: 2-FP

ADIRS CDU ** ON A/C NOT FOR ALL

ADIRS MSU ** ON A/C NOT FOR ALL

(1) ADIRS CDU
The CDU is a three-channel unit. Each CDU channel includes the following features:

a three-position mode selector switch. The modes are:
. power off (OFF)
. navigation (NAV)
. reversionary attitude (ATT)

NOTE: The NAV position has a detent which requires a pull force to change from NAV to ATT or from NAV to OFF.

an indicator announcing when the IR is aligning (ALIGN legend of IR annunciator)
an IR fault indicator (FAULT legend of IR annunciator)
a pushbutton switch to disable ADR output buses. It is a momentary action pushbutton switch
an indicator announcing when the ADR output buses are turned off (OFF legend of ADR pushbutton switch)
an ADR fault indicator (FAULT legend of ADR pushbutton switch).

The following items of equipment are shaped between the three channels :

a keyboard to enter the initial position in degrees, minutes and tenth of minutes or magnetic heading in the attitude mode
two data pushbutton switches (ENT and CLR) with cue lights
a liquid crystal display for selected parameters. The LCD has 16 digits and each digit has 14 segments
a DATA DISPLAY selector switch to select parameters for display on the LCD:
* wind (WIND)
* present position (PPOS)
* true heading (HDG)
* status of selected system (STS)
* track and ground speed (TK/GS)
* test values (TEST)
a SYS DISPLAY selector switch with four positions: OFF, 1, 2, 3. The OFF position disables the display of the CDU but the mode control of the ADIRUs remains active
an ON BAT annunciator.

The CDU contains three identical connectors referenced J1, J2 and J3.

ADIRS CDU - Identical Connectors ** ON A/C NOT FOR ALL

This LRU uses an Intel 8031 microprocessor. The CDU receives an IR bus from each ADIRU to display navigation data.
It provides one bus per ADIRU to permit IR initialization.

ADIRS CDU - Internal Block Diagram ** ON A/C NOT FOR ALL

No cooling air is provided to the CDU.
The CDU is supplied with 28VDC from the selected ADIRU to drive internal circuits and the data display. The 28VDC inputs are isolated from each other. The aircraft supplies 5VAC power for panel lighting/LCD backlighting and for annunciator lighting.

(2) ADIRS MSU
The MSU is a three-channel unit. Each MSU channel is dedicated to one separate ADIRU and includes the following features:

a three-position mode selector switch. The modes are:
. power off (OFF)
. navigation (NAV)
. reversionary attitude (ATT)

NOTE: The NAV position has a detent which requires a pull force to change from NAV to ATT or from NAV to OFF.

a pushbutton switch to disable IR output buses. It is a momentary action pushbutton switch
an indicator announcing when the IR output buses are turned off (OFF legend IR pushbutton switch)
an IR fault indicator (FAULT legend of IR annunciator)
a pushbutton switch to disable ADR output buses. It is a momentary action pushbutton switch
an indicator announcing when the ADR output buses are turned off (OFF legend of ADR pushbutton switch)
an ADR fault indicator (FAULT legend of ADR pushbutton switch).

An ON BAT annunciator is shared by the three channels.
The MSU contains three identical connectors referenced J1, J2 and J3.

ADIRS MSU - Identical Connectors ** ON A/C NOT FOR ALL

B. ADIRU

ADIRS - General View ** ON A/C NOT FOR ALL

(1) General
The ADIRU is contained in a 4 MCU case as defined in ARINC 600. The ADIRU has to be aligned on a special shelf in the avionics compartment in accordance with the installation design described in ARINC 738. This installation involves modification of the ARINC 600 standard to include three alignment pins and a floating connector.
Pins 12 and 13 of the bottom plug have been modified with a reducer to accept power input instead of coax input as defined in ARINC 738.
All input discretes are electrically isolated by an in-line diode or an equivalent device. The discrete outputs are protected by means of diodes to permit a wired OR circuit with other outputs.
The ADIRU is designed to reach a high level of protection for lightning and Electromagnetic Interference (EMI). The lightning protection circuitry is made up of discrete components which consist of high-powered Zener diode type semiconductors called Transzorbs. Varistors are used on the power supply input lines. Varistors are voltage-controlled resistors that go to a low impedance state when a voltage above their clamp voltage is applied, thus shunting the lightning current.
As each ADIRU is a common point to all engines installed on the aircraft, special care is taken to make impossible any electrical disturbance to propagate through the ADIRU/engine interface to other inputs/outputs dedicated to engines.
The ADIRU contains an ADR and an IR portion supplied by a common power (115VAC, 28VDC).

(2) ADR portion

ADIRU - Block Diagram ** ON A/C NOT FOR ALL

This portion uses a 68000 microprocessor. Five resolvers can be used for the analog baro-correction and the AOA inputs. The ADR provides eight ARINC 429 Low-Speed output buses (buses 5 to 8 are reserved for engine control).
A bus isolation is provided using in-line fuses in all ADR buses 5-8 reserved to the engine control.
Each bus can drive twenty ARINC bus loads.

(3) IR portion

ADIRU - Block Diagram ** ON A/C NOT FOR ALL

This portion uses a 80960 microprocessor.
It provides a high-voltage power supply used by the gyros.
The gyros/accel sensors block contains three accels and three gyros mounted along each axis.
The IR provides four ARINC 429 High-Speed output buses. Each bus can drive twenty loads.

[Rev.10 from 2021] 2026.04.02 06:23:05 UTC