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BITE System - Specifications
Figure 001
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-
the functional test of the braking system,
-
the functional test of the nosewheel steering system.
(1)
Functional test of the braking system.
(Ref. Fig. 002)
The test is performed as indicated below:
-functional test of the braking on the engaged system,
-transfer of the system 2 after dialogue by the discretes reserved to the test,
-functional test of the braking on the engaged system.
(2)
Functional test of the nosewheel steering
(Ref. Fig. 003)
The test is performed as indicated below:
-functional test of N/W steering SYS 2,
-SYS 1 return,
-functional test of N/W steering SYS 1 until touchdown of the main gear wheels.
C. BSCU Internal Monitoring Devices A procedure that monitors the microprocessor activity is installed on each microprocessor board and called hardware watchdog. The software sequencing is also monitored by a software watchdog.
D. Dialogue with the Centralized Fault Display System (CFDS). At a line stop, the Centralized Fault Display System permits to check most of the aircraft systems from the cockpit. The electronic functions of the BSCU are designed as BITE systems, i.e. they are capable of a certain self-diagnosis. The CFDS includes: (Ref. Fig. 004)
-
a Centralized Fault Display and Interface Unit (CFDIU) which ensures the junction with the BITE of each system and manages the display of messages,
-
a Multifunction Control and Display Unit (MCDU),
The BSCU is connected to the CFDS by a bi-directional ARINC 429 link
(type 1 system).
The type 1 system comprises one ARINC 429 bus input and output which
enables bi-directional dialogue.
(Ref. Fig. 004)
The system has the capability to memorize data which concern the faults
detected over a maximum of 64 flights.
The system BITE comprises non volatile memory zones (EEPROM of BSCU).
This link permits to transmit the failure messages in 2 operating modes:
- operation in the Normal mode,
- operation in the Menu mode.
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Braking - Functional Test
Figure 002
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N/W Steering Functional Test - Chronogram
Figure 003
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CFDIU/BSCU Interface
Figure 004
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(1) Operation in the Normal mode (Ref. Fig. 005) During a flight, as soon as a failure is detected by the BITE of the BSCU, it is sent to the CFDIU. These failures are sent in plain english in accordance with the ISO 5 encoding, through the ARINC 429 link, under the label 356.
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Fault Messages - Text Transmissions to the CFDS (Label 356) from the BSCU
Figure 005 (SHEET 1)
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Fault Messages - Text Transmissions to the CFDS (Label 356) from the BSCU
Figure 005 (SHEET 2)
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Fault Messages - Text Transmissions to the CFDS (Label 356) from the BSCU
Figure 005 (SHEET 3)
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Fault Messages - Text Transmissions to the CFDS (Label 356) from the BSCU
Figure 005 (SHEET 4)
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Fault Messages - Text Transmissions to the CFDS (Label 356) from the BSCU
Figure 005 (SHEET 5)
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(2) Transmission in the Menu mode
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