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ADIRS to the airport reference point extracted from the FMS database. This reduces the risk of
entering incorrect values.
If the GPS is not available, and long segments in poor radio navaid coverage airspace are
expected, initialize the ADIRS to the gate coordinates. This increases the accuracy of the ADIRS
position computation.
If the airport reference point is not stored in the FMS database, and the gate coordinates are not
available, use the airport reference point coordinates from the airport chart.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
NAVIGATION
A330/A340 FLEET PRO-SUP-34 P 23/24
FCOM 19 AUG 10
ALIGN IRS prompt..................................................................................................................PRESS
The MCDU INIT page coordinates are sent to the ADIRS, and their navigation starting point is set.
Applicable to: ,
POSITION INITIALIZATION
The alignment phase is completed, when the ADIRS is initialized to an appropriate position. If
the GPS is available, initialization is automatic, using the GPS position. Pilot intervention is not
necessary. However, automatic initialization may be manually overriden by pilot entry, at any
moment during the alignment phase. In this case, perform the following procedure as soon as
possible, to prevent delays, if an alignment error occurs :
MCDU coordinates.................................................................................................. CHECK/MODIFY
When the pilot enters or modifies the origin airport (FROM) or the CO RTE, the MCDU INIT
coordinates are reset to the airport reference point (extracted from the FMS database). The pilot
may also manually modify these coordinates.
If the MCDU INIT coordinates change, when the ADIRS are already in NAV mode, the RESET IRS
TO NAV message is triggered on the MCDU : Crosscheck the MCDU INIT coordinates against the
IRS position on the MCDU POSITION MONITOR page.
When the GPS is available, or for flights in good radio navigation coverage airspace, initialize the
ADIRS to the airport reference point extracted from the FMS database. This reduces the risk of
entering incorrect values.
If the GPS is not available, and long segments in poor radio navaid coverage airspace are
expected, initialize the ADIRS to the gate coordinates. This increases the accuracy of the ADIRS
position computation.
If the airport reference point is not stored in the FMS database, and the gate coordinates are not
available, use the airport reference point coordinates from the airport chart.
ALIGN IRS prompt..................................................................................................................PRESS
The MCDU INIT page coordinates are sent to the ADIRS, and their navigation starting point is set.
Applicable to:
ALIGNMENT/INITIALIZATION ERROR
The ADIRS keeps a record of the last position it had the last time it was in NAV mode. It is
also able to estimate the present latitude after a complete alignment. The ADIRS may use this
information to detect coarse initialization errors.
If any of the 3 ADIRS indicates an alignment error, the prompt REALIGN IRS reappears on the
INIT page (instead of ALIGN IRS).
�� If the IR FAULT light flashes, the affected ADIRS can only be used in ATT mode.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
NAVIGATION
A330/A340 FLEET PRO-SUP-34 P 24/24
FCOM 19 AUG 10
Applicable to: ,
ALIGNMENT/INITIALIZATION ERROR
The ADIRS keeps a record of the last position it had the last time it was in NAV mode. It is
also able to estimate the present latitude after a complete alignment. The ADIRS may use this
information to detect coarse initialization errors.
If the pilot manually initializes the ADIRS, and a GPS position is available, the GPS position is
used to crosscheck the pilot entry.
If any of the 3 ADIRS indicates an alignment error, the prompt REALIGN IRS reappears on the
INIT page (instead of ALIGN IRS).
�� If the IR FAULT light flashes, the affected ADIRS can only be used in ATT mode.
AUTOMATIC DEPENDENT SURVEILLANCE - BROADCAST (ADS-B)
Applicable to:
ADS-B OUT
When the Air Traffic Controller requests to stop transmitting ADS-B OUT surveillance data or
altitude (e.g. when she/he requests “STOP ADS-B TRANSMISSION” or “STOP ADS-B ALTITUDE
TRANSMISSION”), do not switch off the ATC transponder or the altitude reporting, in order to
maintain TCAS operations or Air Traffic Control radar surveillance and refer to Aeronautical
Information Publication (AIP) for alternate procedure.
A330/A340 FLIGHT CREW
OPERATING MANUAL
　
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