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coordinates are reset to the airport reference point (extracted from the FMS database). The pilot
may also manually modify these coordinates.
If the MCDU 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:
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.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
NAVIGATION
A318/A319/A320/A321 FLEET PRO-SUP-34 P 13/28
FCOM 19 AUG 10
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 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:
,
,
MSN,,,,
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 reference
coordinates on MCDU IRS INIT page are reset to the airport reference point (extracted from the
FMS database). The pilot may also manually modify these coordinates.
If the MCDU coordinates change, when the ADIRS are already in NAV mode, the ALIGN ON REF
prompt is displayed : Crosscheck the reference coordinates on MCDU IRS INIT page against the
IRS position on the MCDU POSITION MONITOR page.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
NAVIGATION
A318/A319/A320/A321 FLEET PRO-SUP-34 P 14/28
FCOM 19 AUG 10
When the GPS is available, or for flights in good radio navigation coverage airspace, initialize the
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A320机组操作手册FLIGHT CREW OPERATING MANUAL 14(93)
