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effect messages. The relative positions of the messages in a CFR and in the
corresponding PFR may therefore be different.
1.6.9.2 Maintenance message acquisition by the CMC
The CMC acquires certain ECAM messages from the FWC, in the order that
the latter transmits them. This is not necessarily the order in which those
messages were displayed on the Engine Warning Display (E/WD). Up to one
hundred messages can be acquired in one second. The messages indicating
a flag or an advisory are received from the DMCs and must be confirmed for
between 2.4 and 3 seconds in order to be acquired. They are timed once this
confirmation has been made.
F-GZCP - 1st June 2009
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The fault messages are received from the BITE of the various systems. When
a system detects a fault, it transmits a fault message to the CMC containing:
the ATA code (six digits) of the equipment concerned by the fault,
the name of the system that detected the problem, called the source,
the message’s class (1 or 2),
a message describing the fault,
information on whether the fault is of a lasting (“HARD”) nature or not
(“INTERMITTENT”).
When the CMC receives this type of message, it opens a one-minute correlation
window corresponding to the first three or four digits of the ATA code. During
this period, all the fault messages that may have been received including
those same three or four first ATA code digits are grouped together. Once the
minute has elapsed, the CMC closes the correlation window and applies the
priority rules between the correlated messages in order to generate an overall
message:
class 3 messages are not taken into account,
a class 1 message takes priority over a class 2 message,
for two messages of the same class, a message reporting an internal fault
(the system detects a fault in its own operation) takes priority over one
reporting an external fault (the system observes a fault in another system),
and as a last resort, the oldest message takes priority.
The overall message generated then contains the priority message’s
information (ATA code, source, etc.), to which is added the list of names of
the other systems called identifiers that have generated correlated messages.
It is this overall message that then appears in the CFR or PFR. So, no information
on the descriptions of the messages transmitted by the identifiers is given; only
the description of the priority message is saved. Furthermore, if the source or
one of the identifiers has transmitted a class 2 message, its name is preceded
by an asterisk (*). The following theoretical sequence is given as an example:
F-GZCP - 1st June 2009
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Time Fault message Change in the overall message at each stage
T0
“message 1”
Class 2
Source: SYS1
“message 1”
Class 2
Source : SYS1
Identifiers: -
T0+5 s
“message 2”
Class 1
Source: SYS2
External fault
“message 2”
Class 1
Source: SYS2
Identifiers: *SYS1
T0+10 s
“message 3”
Class 1
Source: SYS3
Internal fault
“message 3”
Class 1
Source: SYS3
Identifiers: SYS2,*SYS1
T0+59 s
“message 4”
Class 2
Source : SYS3
“message 3”
Class 1
Source: *SYS3
Identifiers: SYS2,*SYS1
T0+1 min
Closing of the correlation window.
Generation of the overall message.
All the messages are timed to the nearest minute. The timing of an ECAM
message consists of the time of its acquisition by the CMC, and that of a fault
message is the time at which the correlation window opened. It is therefore
possible in a CFR to find an ECAM message preceding a fault message that is
nevertheless timed one minute before it. So, for example:
Occurrence time Message CFR
hh:10:10
“message 1“
fault
Opening of a correlation window
hh:10:15
“message 2“
ECAM
ECAM message dated hh10
hh:11:05
“message 3“
ECAM
ECAM message dated hh11
hh:11:10
End of the
“message 1”
correlation window
Fault message dated hh10
1.6.9.3 Transmission of maintenance messages by the CMC
In order to transmit the messages by ACARS, the CMC sends them to the ATSU.
ECAM messages are transmitted in real time as soon as they are acquired. Flag
or advisory messages are transmitted as soon as they have been confirmed.
Fault messages are transmitted as soon as the corresponding correlation
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Interim report on the accident on 1st June 2009 to the Airbu(9)
