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window and applies the priority rules between the correlated messages in order to generate
an overall message:
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• 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:
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
10:10:10 “message 1”
fault
Opening of a correlation window
10:10:15 “message 2”
ECAM
ECAM message dated hh10
10:11:5 “message 3”
ECAM
ECAM message dated hh11
10:11:10 End of the “message 1”
correlation window
Fault message dated hh10
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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 window is closed.
1.6.10 Radio communications system
The Airbus A330’s radio communications system consists of the following equipment:
• VHF and HF transmitters-receivers
• RMPs,
• audio integration systems: ACP and AMU.
Each VHF / HF transmitter-receiver can be controlled by one of the three RMPs.
1.6.10.1 VHF equipment
There are three identical VHF communication systems installed. Each system includes:
• a transmitter-receiver in the avionics compartment,
• an antenna on the upper part of the fuselage for VHF 1 and VHF 3, and on the lower
part of the fuselage for VHF 2.
1.6.10.2 HF equipment
The aircraft has two HF communication systems. Each system includes:
• a transmitter-receiver in the avionics compartment,
• an antenna coupler situated at the root of the stabiliser,
• a shared antenna integrated in the leading edge of the fin.
Since the HF system has a range of several thousand kilometres, a large number of communications
are received. Furthermore, the quality of the transmissions may sometimes be
poor. Communications may also be interrupted due to natural phenomena.
A SELCAL call system, transmitting a light and sound signal, informs the crew when a
ground station is attempting to contact them.
1.7 Meteorological Conditions
1.7.1 Meteorological Situation
Appendix 1 contains the complete detailed study supplied by Météo France.
From a climatology point of view, the general conditions and the position of the Inter-tropical
Convergence Zone over the Atlantic were normal for the month of June. Cumulonimbus
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