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erroneous Radio
Altimeter (RA) height indication.
Erroneous RA height indication may have on aircraft systems, any of the effects listed
in the OEB1 of
the FCOM.
This OEBPROC1 is issued to provide flight crews with the following
recommendations:
During all phases of flight, the flight crew must monitor and crosscheck all primary
flight parameters and
FMA indications.
During ILS (or MLS, GLS) approach with AP engaged, in the event of an unexpected
early THR IDLE
and FLARE modes engagement, the flight crew must immediately react as follows:
Immediately ‐ perform an automatic Go-Around (Thrust Levers set to TOGA),
OR
‐ Immediatly disconnect the AP,
‐ Then continue the landing using raw data or visual references (FDs set to OFF),
OR
‐ Perform a manual Go-Around (Thrust Levers set to TOGA). Significant
longitudinal sidestick input
may be required.
Note: 1. If the flight crew does not immediately react, the angle-of-attack will
increase and may reach
the stall value.
2. In case of Go-Around and if the RA is still frozen at a very low height indication:
‐ SRS and GA TRK modes engage
‐ NAV, HDG or TRK lateral modes cannot be selected
‐ LVR CLB will not be displayed on the FMA at THR RED ALT
‐ ALT* and ALT will not engage at FCU altitude
Disconnecting AP and resetting both FDs enable to recover basic modes (HDG and
V/S).
3. In CONF FULL, the auto-trim function is inhibited. Regarding one step enable to
recover the
auto-trim function.
For all the others events that may occur during approach, there is no change in the
procedures or in the
recommended flight crew reactions.
Flight crews must report in the aircraft technical logbook if any of the consequences
listed in the OEB1
of the FCOM, are seen.
OEBPROCOEBPROC1
AQU3I1CK8 R/AEF3E1RE9N/ACE3 H2A0ND/A B3O2OK1 4/4
OPERATIONS ENGINEERING BULLETINS
30 AUG 10
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A318/A319/A320/A321 FLEET , , , , , , , ,
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OEBPROCOEBPROC1
AQU3I1CK8 R/AEF3E1RE9N/ACE3 H2A0ND/A B3O2OK1 1/4
OPERATIONS ENGINEERING BULLETINS
30 AUG 10
A318/A319/A320/A321 FLEET , , , , , , , ,
, , , , , , , , , , , ,
, , MSN 4566, 4719, 4617, 4473
ERRONEOUS RADIO ALTIMETER (RA) HEIGHT INDICATION
OEB1 Issue 1
ERRONEOUS RADIO ALTIMETER (RA) HEIGHT INDICATION - APPROVAL
This OEB covers a significant operational issue. Non-compliance with this OEB may
have a significant
impact on the safe operation of the aircraft.
Therefore, Operators must distribute this OEB, or the information contained in this
OEB, to all flight crews
without delay.
In addition, it is recommended that all Operators rapidly incorporate applicable
corrective Service Bulletins as
soon as they become available.
Reason for issue: Issue 2
This OEB is revised to:
Further highlight that during ILS (or ‐ MLS, GLS) approach with AP
engaged, in the event of an unexpected early THR IDLE and FLARE
modes engagement, the flight crew must immediately react to prevent the
angle-of-attack from increasing.
‐ Provide additional explanation of erroneous RA height indication effects on
Auto Flight System (AFS) and flight control law, in case of Go-Around.
‐ Provide operational recommendation in case of Go-Around.
Issue 1
In follow-up to questions received from several Operators, the objective of this
OEB is to remind Operators of the possible operational consequences of an
erroneous Radio Altimeter (RA) height indication
Applicable to: All A318/A319/A320/A321 operators
Cancelled by: TBD
Note: The interchangeability code, given in the Illustrated Part Catalog (IPC),
indicates the conditions for interchangeability of
equipment. After installation of corrective modification(s)/SB(s), if an Operator
reinstalls any equipment affected by this OEB, it is
the Operator's responsibility to ensure that the recommendations given in this OEB
are applied again for the applicable aircraft.
OEBs are issued by Airbus, as the need arises, to rapidly inform operators of any
deviations from initial
design objectives that have a significant operational impact.
Airbus distributes OEBs to all FCOM holders.
The information in the OEB is recommended by Airbus, but may not be approved by
Airworthiness
Authorities.
If the procedures contained in the OEB differ from the procedures in the AFM, the
approved AFM remains
the reference.
OEBPROCOEBPROC1
AQU3I1CK8 R/AEF3E1RE9N/ACE3 H2A0ND/A B3O2OK1 2/4
OPERATIONS ENGINEERING BULLETINS
30 AUG 10
A318/A319/A320/A321 FLEET , , , , , , , ,
　
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