ADIRS CDU - Component Location
Figure 002
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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
(Ref. Fig. 003)
The ADIRS CDU contains three identical connectors. Each connector is
linked to one ADIRU.
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).
**ON A/C 001-004,
(2) ADIRU The ADIRU receives data and computes outputs in accordance with ARINC
738. It uses an ARINC 600 type 2 floating-connector.
(a) 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
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ADIRS CDU - Electrical Interface
Figure 003
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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 two ARINC 743 GPS receivers. The data are in ARINC 429 high speed format. These data concern various parameters such as position, velocity, integrity,...
-the ADIRU provides provision for digital input buses.
(b) 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
1EFF : 001-004, 1 34-12-00Page 6 1 1 Config-1 May 01/00 1 1 1CES 1 These two inputs (one for each GPS sensor) allow the ADIRU to be synchronized with the GPS receivers.
-115VAC The ADIRU operates from the 115VAC/400 Hz primary power.
-28VDC back-up The ADIRU can operate from the 28VDC back-up power.
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