IR - Binary Output Word 2/2
 Figure 004

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 IR - BCD and Special Output Words
 Figure 005

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 (2) Discrete outputs The IR provides three discrete outputs. Table below defines the characteristics of these discretes.
 ---------------------------------------| SIGNAL | OUTPUT | DEFINITION | |----------|-------------|------------| | ON BAT | OPEN/+28VDC | NO/YES | | IR FAULT | OPEN/+28VDC | NO/YES | | IR ALIGN | OPEN/GROUND | NO/YES | ---------------------------------------
-ON BAT When the IR is powered with batteries, this discrete delivers a 28VDC state and sets the ON BAT light to on.
 -
IR FAULT When a failure is detected by the IR, this discrete delivers a 28VDC state and sets the FAULT legend to on.

 -
IR ALIGN When the IR is aligning, this discrete delivers a ground and sets the ALIGN legend to on.

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 3. Operation/Control and Indicating
________________________________
 (Ref. Fig. 006)

 A. Control
 (1)
 Modes of operation Operation interface with the IR is performed through the Multipurpose Control and Display Unit 1(2) (MCDU) or the CDU. The MCDU 1(2) is used for entering initialization data and displaying IR data. (Ref. Fig. 007) The CDU is used for mode selection, IR annunciation (FAULT, ALIGN), for entering initialization data and displaying IR data. The IR has three selectable modes: OFF, NAV and ATT. The relation between the mode selection and system response is shown in the figure (Ref. Fig. 008)

 (2)
 OFF mode When the OFF/NAV/ATT selector switch on the CDU is in the OFF position, all circuitry in the ADIRU is de-energized except for any logic associated with the power-off function. When the ADIRU has turned off, it consumes less than 10 milliamps (needed for power supply turn-on control). The power supply of the ADMs is switched off. A period is required between switching to OFF and actual power-off. During this sequence, the last position computed is stored .

 (3)
 NAV (Navigation) mode After selection of the NAV mode on the ground, the IR automatically enters the NAV mode if a self-determined satisfactory alignment has been completed. If alignment is not completed, the IR remains in the Align submode. No updating of the IR present position latitude and longitude is allowed once the IR has completed the Align submode. The IR latitude and longitude entered during alignment is the starting point for its computation. The following logical processes are mechanized:

 -OFF to NAV provides automatic alignment in 10 minutes for latitudes between 73.N and 60.S, with automatic entry to NAV mode. Requires initial position data to be entered.
 NOTE : The automatic alignment requires 15 mn delay for latitudes
____ between 73.N and 82.N. For high latitudes, the alignment is provided by an operational procedure which delays the entering of the initial position by the crew. Accuracies of the system are slightly degraded.
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 IR - Operation/Control and Indicating
 Figure 006

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 IR - Alignment Procedure from the MCDU
 Figure 007

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 IR - Mode State Diagram
 Figure 008

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 -a message on the UPPER ECAM DU indicates that the IRs are in ALIGN submode with the maximum time until NAV
 -in the NAV mode, rapid realignment of the IR is initiated by switching the OFF/NAV/ATT selector switch from NAV to OFF and back to NAV within 5 seconds. The IR starts a 30-second realignment submode with existing attitude and heading angles and rezeroed velocities
 -the system does not enter the rapid realignment sequence if the
 ground speed is greater than 20 knots. The CDU permits to observe some particular parameters (Ref. 34-12-00).
 (a)
 Initialization data (Ref. Fig. 009) IR alignment is carried out on the ground before takeoff and after the entry of the current aircraft coordinates on the INIT page of the MCDU 1(2) (Ref. 22-72-00) or on the CDU (DATA DISPLAY selector switch in PPOS position). Valid initial position data must be received and verified by the IR during the 10-minute alignment or automatic sequencing to the NAV mode will be delayed after position data is received. Initial position data are verified by the IR (Ref. Para. 2.C.(1)-Position entry data processing). If a miscompare exists then: - on the ADIRS CDU, the ALIGN light flashes.
　
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