(a) Test pass:
-ALIGN legend of the IR 1 (2) (3) annunciator on.
NOTE : It means that the system is in align mode.
____
(b) Test failed:
-ECAM warning
-
NAV IR 1 (2) (3) FAULT or
-
NAV ADR 1 (2) (3) FAULT
depending on the faulty part.
-ADIRS panel:
-FAULT legend of the IR 1 (2) (3) annunciator on or FAULT/OFF
of the ADR 1 (2) (3) pushbutton switch on.
depending on the faulty part.
NOTE : In case of failure, set the DISPLAY/DATA selector switch
____ to STS then do the troubleshooting procedure on the system according to the error code displayed on the ADIRS panel.
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R Post SB 34-1240 For A/C 001-049,101-105,151-199,201-203,
ADIRS - BITE - DESCRIPTION AND OPERATION
________________________________________
R **ON A/C 051-099, 106-149, 204-299, 301-399, 401-499,
1. General
_______ The Built-in Test Equipment (BITE) facilitates maintenance on in-service aircraft. It detects and identifies faults related to the Air Data/Inertial Reference System (ADIRS) and reports them to the Centralized Fault Display Interface Unit (CFDIU). The BITE is included in the following LRUs:
-
Air Data/Inertial Reference Unit (ADIRU)
-
Air Data Module (ADM)
-Control and Display Unit (CDU). It is linked to the CFDIU through the ADIRU (ADR and IR portions) which summarizes the BITE results for its own channel (Ref. Fig. 001) . The ADM performs various tests to detect its own faults (watchdog timer, RAM addressing, ROM, CPU, RAM, NVM etc.) and failed input signals (check of programming pins). Faults are annunciated to the ADR by omission or labeling of a faulty output word (pressure label) and through the use of a discrete fault-code word output on the ARINC bus. Fault reports are also stored in a non-volatile memory inside the ADM. The IR BITE monitors: the performance of both IR NAV and IR I/O processors, external inputs (both digital and discrete), the functionality of the other internal hardware including the power supply and the inertial sensors (gyro, accelerometers). These BITE tests are performed either at power-up or continuously (Ref. Para. 3.A.(2)). Some tests enable to monitor operation errors. These are: Align in air, Excessive Motion, Latitude Sin/Cos test. They result in IR warnings but without fault message sent to the CFDIU. Tests and fault reactions are described in Para. 3.B. The ADR BITE monitors: the performance of the ADR processor, the functionality of other ADR internal hardware, the status of analog, digital and discrete inputs and cross-channel comparisons with the other ADRs. These BITE tests are performed either at power-up or continuously (Ref. Para. 3.A.(3)) with the exception of cross-channel comparisons which are run once at takeoff.
R 1EFF : ALL 1 34-18-00Page 1 1 1 Config-3 Aug 01/05 1 1 1CES 1
ADIRS - Interface between one ADIRU and the CFDIU
Figure 001
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The common BITE monitors the computer performances (INTEL 80960 processor
and memories) with the following tests : watchdog timer, checksum, RAM
pattern monitor.
The ADR and IR BITEs send reports to the CFDIU through the ARINC output bus,
on label 356. These reports memorize the faults which occurred during the
last 63 flight legs with their context. They operate in two modes:
-NORMAL mode: fault reporting to the CFDIU during the flight
-INTERACTIVE mode: on the ground. Access by the MCDU MENU pages (Ref. Para. 3.B.).
2. Component Location__________________
A. Computers Directly Linked to the CFDS
-------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF.
-------------------------------------------------------------------------------1FP1 ADIRU-1 127 824 34-12-34 1FP2 ADIRU-2 128 824 34-12-34 1FP3 ADIRU-3 127 824 34-12-34
B. ADIRS Control Panel
-------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF. -------------------------------------------------------------------------------2FP CDU-ADIRS 20VU 211 831 34-12-12
R 1EFF : 051-099, 106-149, 204-299, 301-399, 1 34-18-00Page 3 1401-499, 1Config-3 Aug 01/05 1 1 1CES 1 C. Other LRUs of the System
-------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF. -------------------------------------------------------------------------------
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