R **ON A/C 001-049, 101-105, 151-199, 201-203,
Post SB 34-1147 For 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 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.
R 1EFF : 001-049, 101-105, 151-199, 201-203, 1 34-12-00Page 7 1 1 Config-1 May 01/05 1 1 1CES 1 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, 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 These two inputs (one for each Multi-Mode Receiver) allow 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).
R 1EFF : 001-049, 101-105, 151-199, 201-203, 1 34-12-00Page 8 1 1 Config-1 May 01/05 1 1 1CES 1
R **ON A/C 001-049, 101-105, 151-199, 201-203,
R (c) Discrete inputs
R These inputs are generally pin programs except for:
R - Static Source Error Correction (SSEC) and AOA correction and
R selection discretes which come from the Slat and Flap Control
R Computers (SFCC) and are linked to flap position
R (Ref. Fig. 004)
R - heat discretes which come from the associated Probe Heat
R Computer (PHC)
R - VMO/MMO discrete provided by the position of the L/G DOWN
R VMO/MMO SELECTION switch (22FP).
R - ADR selection:
R It indicates, to the IR, the air data source to be used.
R - CDU ON/OFF :
R It indicates, to the ADIRU, whether the ADIRU data are
R currently displayed on CDU.
R - ADR OFF:
R It indicates, to the ADIRU, that the crew has pushed the ADR
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