R 1EFF : 401-499, 1 34-14-00Page 72 1 1 Config-3 Aug 01/05 1 1 1CES 1
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| BIT No.| FUNCTION |
|--------|--------------------------------------------------------------------|
R | 28 | TEST INHIBIT Inhibit = 1 |
R | 29 | COMMAND WORD ACKNOWLEDGE Forced = 0 |
R | 30 | SSM |
R | 31 | SSM |
R | 32 | PARITY |
R -------------------------------------------------------------------------------
R GPSSU Navigation Maintenance Word (Label 355)
R 1EFF : 401-499, 1 34-14-00Page 73 1 1 Config-3 Aug 01/05 1 1 1CES 1R **ON A/C 051-099, 106-149, 204-299, 301-399, 401-499,
(2) Discrete outputs The IR provides 3 discrete outputs. The following table 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 | ---------------------------------------
Discrete Outputs
-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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(Ref. Fig. 009)
A. Control
(1)
Modes of operation Operation interface with the IR is performed through the Multipurpose Control and Display Unit 1(2) or the CDU. The MCDU 1(2) is used for entering initialization data and displaying IR data. (Ref. Fig. 010) 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. 011)
(2)
OFF mode When the OFF/NAV/ATT selector switch on the CDU is in the OFF position, all circuitry in 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 of 15 seconds is required between switching to OFF and actual power off. During this sequence, the last position computed is stored in NVM.
(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 min 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.
R 1EFF : 051-099, 106-149, 204-299, 301-399, 1 34-14-00Page 75 1401-499, 1Config-3 Aug 01/05 1 1 1CES 1
IR - Operation/Control and Indicating
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