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Visual
warning
SD
page Local alarm
Inhibited
in phase
6
F/CTL RUD TRV LIM FAULT Single chime Master caution F/CTL - no
Meaning: This message indicates the unavailability of the rudder deflection limitation
calculation function. The limitation value remains frozen at the current value at the time of the
failure (until the slats extension command is given).
o MAINTENANCE STATUS EFCS2 and MAINTENANCE STATUS EFCS1 (2 h 10)
These ECAM messages are not brought to the attention of the crew in flight.
o FLAG ON CAPT PFD FPV and FLAG ON F/O PFD FPV (2 h 11)
Symptoms: Disappearance of the FPV (bird) on the PFDs, Captain and First Officer sides,
and display of the red FPV flag.
Meaning: This message indicates that the FPV function is selected and unavailable.
o NAV ADR DISAGREE (2 h 12)
ECAM Alarm Aural
warning
Visual
warning
SD
page Local alarm
Inhibited
in phase
6
NAV ADR DISAGREE Single chime Master caution - - no
Meaning: This message indicates that the EFCSs have rejected an ADR, and then identified
an inconsistency between the two remaining ADRs on one of the monitored parameters.
51
o F/CTL PRIM 1 FAULT (2 h 13)
ECAM Alarm Aural
warning
Visual
warning
SD
page Local alarm
Inhibited
in phase
6
F/CTL PRIM 1 FAULT Single chime Master caution F/CTL
“Fault” light on
corresponding
button
no
Meaning: This message indicates that FCPC1 (PRIM 1) has stopped functioning. This
shutdown could be the result of a command or of a failure.
o F/CTL SEC 1 FAULT (2 h 13)
ECAM Alarm Aural
warning
Visual
warning
SD
page Local alarm
Inhibited
in phase
6
F/CTL SEC 1 FAULT Single chime Master caution F/CTL
“Fault” light on
corresponding
button
no
Meaning: This message indicates that FCSC1 (SEC 1) has stopped functioning. This
shutdown could be the result of a command or of a failure.
o MAINTENANCE STATUS ADR2 (2 h 14)
This ECAM message is not brought to the attention of the crew in flight.
o ADVISORY CABIN VERTICAL SPEED (2 h 14)
Symptoms: Flashing of the cabin vertical speed indicator on the SD’s PRESS page.
Meaning: This message indicates a cabin altitude variation greater, as an absolute value,
than 1,800 ft/min for five seconds.
Analysis of the fault messages
Five fault messages were received by ACARS. They are described in the order in which they
appear in the CFR.
o PROBE PITOT 1+2 / 2+3 / 1+3 (9DA) (2 h 10)
ATA: 341115
Source: EFCS2
Identifiers: EFCS1, AFS
Class 1, HARD
This message, transmitted by the FCDC2 (EFCS2), means that the FCPCs (or PRIMs)
triggered one of the speed monitoring processes: they have detected a decrease of more
than 30 kt in one second of the “polled” speed value. The three ADRs were considered valid
by the EFCS2 at the time the monitoring was triggered, because the prior rejection of an
ADR would have generated a class 2 fault message and there would therefore have been an
asterisk in front of the source. In this case, the “polled” value is the median value.
52
At the time this monitoring is triggered, the FCPCs open a window during which they operate
with alternate 2 law (see following graphic). The rudder deflection limitation function is also
frozen, but the associated alarm is inhibited. At the end of the window, if the difference
between the values polled at each end of that window is less than 50 kt, the FCPCs return to
normal law. Otherwise, they continue in alternate 2 law, the rudder deflection limitation
function remains unavailable and the corresponding alarm is generated.
Note: the alternate 2 control law is a load factor law for pitch and a direct law for roll. Only the load
factor protection remains available. In certain cases, the high and low speed stabilities may also be
lost.
The presence of the F/CTL RUD TRV LIM FAULT message indicates that EFCS monitoring
had been activated and that the alternate law had been maintained. The rudder deflection
limitation value then remained the same as that before monitoring was triggered.
The identifiers are:
• EFCS1: the FCDC1 is a clone of FCDC2 and it is therefore probable that the message
transmitted by EFCS1 was the same. However, it is not possible to state this
categorically at this stage of the investigation because around twenty messages can
be generated by the EFCSs with an ATA code starting with 341.
• AFS: it does not perform this specific monitoring but can generate a message with an
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