-
the INPUT STATUS page 1/6 comes intoview with the current on-the-ground status of the IR1 (IR2) (IR3) inputs.
-
the related pages come into view.
-
the test procedure stops.
A. Put the aircraft back to its initial configuration.
(1)
On the center pedestal, on the MCDU, push the line key adjacent to the RETURN indication until the MCDU MENU page comes into view.
(2)
Do the ADIRS Stop Procedure(Ref. TASK 34-10-00-860-005).
(3)
De-energize the aircraft electrical circuits
(Ref. TASK 24-41-00-862-002).
Subtask 34-14-00-865-066
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 5CC1, 5CC2
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C. Close Access
(1)
Install the protective cover on the battery power center 105VU:
(2)
Tighten the two screws.
(3)
Close the access door 822.
(4)
Remove the access platform.
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________________________________________
1. General
_______ The Built In Test Equipment 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 the Digital Signal Processor C25 and the outputs of the INTEL 80960, external inputs (both digital and discrete), the functionality of other IR 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 of them enable to monitor operation errors. These tests are: Align in air, Excessive Motion, Latitude comparison 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 ADR outputs of the INTEL 80960 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. 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.).
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ADIRU - Architecture and Interface with CFDIU
Figure 001
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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
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