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 -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.
 (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.
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 -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).
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 (c) 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 (Ref. Fig. 004)
 -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.
 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 filter select:
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 ADIRS - ADIRUs/SFCCs Interface
 Figure 004

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 -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 versions. In this case, the ADIRU selects a table of maintenance messages with a different syntax.
 -
GPS sensor present: This indicates, to the ADIRU, the presence on-board the aircraft of one or two MMRs (GPS portion).
　
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