CFDIU - Faults Storage "at the latest" in CFDIU: Normal Mode
Figure 011A
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CFDIU - Example of CFDIU Operation - Type 3 System Figure 012
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c
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Example : 2 6 - 1 0
| | | | |
1st------- | | | ---------5th
2nd------------ | --------------4th
|
3rd
The informations above are sent only once, at the moment
of the FWC Warning computation (wathever the flight phase
display inhibition is). The warning message is limited to
24 characters.
Example of message sent by the FWC:
26-10 ENG LOOP A FAULT.
The CFDIU ensures the following functions so as to establish the ECAM REPORT:
-Selection of the valid FWC bus.
-Reading filtering and memorization of label 357.
-Association of GMT and of the flight phase with each ECAM warning message memorized.
The CFDIU establishes the AVIONICS STATUS.
At each sequential scrutinization of all buses of Type 1
and 2 systems and of discretes of Type 3 systems, the
CFDIU:
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Monitors the non-refreshment of label 356. After confirmation over 4 seconds, the CFDIU associates a NO X DATA message with this event, X being the identify of the system. If the system resumes normal transmission, the message is deleted. So the CFDIU operates in real time, to the nearest system scrutinization period.
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Monitors systems status:
*
Type 1 and 2 systems The CFDIU monitors the status of bits 20 and 21 of the initial STX word of label 356 on the systems input buses. If bit 21 is set to 1, this means that the system is currently affected by a system internal or external fault (class 1, 2 or 3). If bit 20 is set to 1, this means that the system is currently affected by a class 3 fault. The CFDIU associates the identity of the system, with respect to its input port, with bit 21 and the indication CLASS 3 with bit 20. Example : ILS1. If bit 21 returns to 0, the CFDIU deletes the system identity display.
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Type 3 systems
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d
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The status of Type 3 systems is given by the status of
the discrete connected to the CFDIU.
The discretes are monitored regularly and the system
status can be managed in real time.
The CFDIU associates system identity with each incorrect
status detection (Capacity: 40 lines of 24 characters).
The CFDIU carries out EVENTS CORRELATION
-Principle of the fault correlation function. The purpose of the fault correlation function is to memorize in the CFDIU only one fault message for a given "aircraft fault event". The general principle of this function is therefore to group round a single message all messages which may occur further to a given aircraft event. This single message is as near as possible to the primary fault which generated this aircraft event.
-Criteria of fault correlation and application "window". . Criterion of correlation The criterion of correlation of the fault messages (association or exclusion) is defined by means of the ATA reference of the LRU incriminated by the message. This reference is given by the first 2 labels 356 which follow the STX of the fault message. As a general rule the messages are associated if their ATA reference is nearly the same, i.e.:
*
in most cases, if the first 3 digits of the ATA
reference are identical
*
in some particular cases, if the first 3 or 4 digits of the ATA reference are identical or if they belong to the same group of several digits.
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