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adopted only as a last
resort, and only one reengagement should be attempted.
On ground, do not reengage the C/B of the fuel pump(s) of any tank. For all other
C/Bs, if the flight crew
coordinates the action with maintenance, the flight crew may reengage a tripped C/B,
provided that cause of
the tripped C/B is identified.
COMPUTER RESET
When a digital computer behaves abnormally, as a result of an electrical transient, for
example, the Operator
can stop the abnormal behavior by briefly interrupting the power supply to its
processor.
The flight crew can reset most of the computers in this aircraft with a normal cockpit
control (selector or
pushbutton). However, for some systems, the only way to cut off electrical power is to
pull the associated
circuit breaker.
To perform a computer reset:
Select the related normal cockpit control ‐ OFF, or pull the corresponding reset
pushbutton or circuit
breaker.
‐ Wait 3 s if a normal cockpit control is used, or 5 s if a circuit breaker is used
(unless a different time is
indicated)
‐ Select the related normal cockpit control ON, or push the corresponding reset
pushbutton or circuit
breaker
‐ Wait 3 s for the end of the reset.
WARNING Do not reset more than one computer at the same time, unless instructed
to do so.
Note: Due to the many customization possibilities of the C/B panel:
Before taking any action on the C/B panel, the flight crew must crosscheck that the
C/B label
corresponds to the affected system.
The computers most prone to reset are listed in the table below, along with the
associated reset procedure
or FCOM reference, when applicable.
Specific reset procedures included in OEB or Temporary revisions are not referenced
in this table and, when
issued, supercede this table.
‐ On ground, almost all computers can be reset and are not limited to the ones
indicated in the table.
The following computers are not allowed to be reset in specific circumstances:
•ECU (Engine Control Unit on CFM engines), or EEC (Electronic Engine Control on
IAE engines), and
EIU (Engine Interface Unit) while the engine is running.
•BSCU (Brake Steering Control Unit), if the aircraft is not stopped. (Refer to
FCOM/PRO-SUP-32 BSCU
Reset).
‐ In flight, as a general rule, the crew must restrict computer resets to those listed in
the table, or to those
in applicable Temporary Revisions or OEBs. Before taking any action on other
computes, the flight crew
must consider and fully understand the consequences.
CAUTION Do not pull the following circuit breakers:
‐ SFCC (could lead to SLATS/FLAPS locked).
‐ ECU or EEC, EIU.
Also refer to the Refer to FCOM/99 Duref Cible QRH
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A318/A319/A320/A321 FLEET ,
Note: In the table's "reset" column, the "if applicable" note signifies that, depending
on the computer
standard, the reset procedure may no longer be necessary. If this is the case, the reset
procedure
is removed from the applicable FCOM section.
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COMPUTER RESET TABLE
ATA System malfunction or
ECAM Warning/Caution Affected System Reset
21
VENT AVNCS SYS FAULT AEVC On ground only:
‐ Pull C/B Y 17 on 122VU
‐ Wait 1 s before pushing the C/B.
22
AUTO FLT FCU 1(2) FAULT FCU In flight:
‐ Pull the C/B B05 on 49VU for
FCU1, or M21 on 121VU for
FCU2.
‐ Push it after 5 s.
‐ CHECK the displayed
targets and the barometer
reference, and correct them
if necessary.
On ground:
‐ Pull the C/B B05 on 49VU for
FCU1, or M21 on 121VU for
FCU2.
‐ Push it after 5 s.
‐ If FCU1(2) FAULT
disappears, CHECK the
displayed targets and
barometer reference, and
correct them if necessary
(RESET successful)
‐ If FCU1(2) FAULT remains,
pull both C/B B05 on 49VU
and M21 on 121VU
‐ Push them after 7 min, with
a delay of less than 5 s
between side 1 and 2
‐ Wait at least 30 s for FCU1
and FCU2 safety tests
completion
‐ CHECK the displayed
targets and barometer
reference, and correct
them if necessary (RESET
successful)
To be continued on next page
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