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the possible failed LRUs and can give a snapshot of
the system environment when the failure occured.
MEMORIZATION
- All the information necessary for maintenance and
troubleshooting is memorized in a Non Volatile Memory
(NVM).
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CFDS: BITE PHILOSOPHY
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CFDS: BITE PHILOSOPHY
TEST
The test function can be divided into 4 groups.
POWER UP TEST
- The power up test is first a safety test.
The purpose of a safety test is to ensure compliance
with the safety objectives.
It is executed only on ground after long power cuts
(more than 200ms).
Its duration is function of the system which is not
operational during the power up test.
If the aircraft is airborne, the power up test is
limited to a few items to enable a quick return to
operation of the system.
The typical tasks of a power up test are: test of
microprocessor, test of memories, test of ARINC 429
and various I/O circuits, configuration test.
CYCLIC TESTS
- These tests are carried out permanently.
They do not disturb system operation.
The typical tasks of a cyclic test (also called IN
OPERATION TEST) are: Watchdog test (a watchdog is a
device capable of restarting the microprocessor if the
software fails) and RAM test. Permanent monitoring is
performed by the operational program (e.g. ARINC 429
messages validity).
SYSTEM TEST
- The purpose of this test is to offer to the
maintenance staff the possibility to test the system
for troubleshooting purposes.
This test can be performed after the replacement of a
LRU in order to check the integrity of the system or
sub-system.
It is similar to the POWER-UP TEST but it is more
complete.
It is performed with all peripherals supplied.
SPECIFIC TESTS
- For some systems, specific tests are available.
The purpose of these tests is to generate stimuli to
various command devices such as actuators or valves.
They can have a major effect on the aircraft (automatic
moving of flight control surfaces, engine reverser..).
NEW CONCEPT
The BITE information stored in the system BITE memories
is sent to a centralized maintenance device.
The manual tests (SYSTEM TEST and SPECIFIC TESTS) can
be initiated via this centralized maintenance device.
Its main advantages are:
- single interface location (cockpit).
- easy fault identification.
- reduction of the troubleshooting duration.
- simplification of the technical documentation.
- standardization of the equipment.
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31 - INDICATING/RECORDING SYSTEMS
31-32-00 CFDS: CFDS PRESENTATION
CONTENTS:
CFDIU
BITE
ECAM
MCDU
Printer
MDDU
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CFDS: CFDS PRESENTATION
CFDIU
The Centralized Fault Display Interface Unit (CFDIU)
receives failure messages from the aircraft systems.
It memorizes and manages them. Information is available
in various reports.
The Centralized Fault Display Interface Unit consists
of two distinct channels:
- A NORMAL CHANNEL which ensures all the functions.
- A STANDBY CHANNEL which permits restricted operation
when the normal channel is faulty.
BITE
The BITE is a function incorporated in the computers
which detects, localizes and memorizes failures.
All systems including a Built In Test Equipment (BITE)
are connected to the CFDIU.
ECAM
The ECAM monitors the aircraft systems. The warning
information is delivered to the Centralized Fault
Display System.
FWC: Flight Warning Computer
All types of failures except secondary failures are
sent to the CFDS.
MCDU
The Multipurpose Control and Display Unit (MCDU) is a
display unit and a keyboard used by the CFDS to display
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