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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.
ALIGN ON REF prompt.................................................................................PRESS and CONFIRM
The reference coordinates on MCDU INIT page 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 the ADIRS alignment or initialization is not correct, the ALIGN light will flash. If any of the 3
ADIRS indicates an alignment error, the prompt REALIGN IRS appears on the INIT page (instead
of ALIGN IRS).
If the IR FAULT light flashes,
the affected ADIRS can only be used in ATT mode.
If the ALIGN light flashes before the alignment phase is completed :
DISPLAY DATA switch..........................................................................................................STS
If the CDU does not display any message, the position sent to the ADIRS disagrees with the
last memorized position, or with the ADIRS estimated latitude. Check the initialization position,
and reenter it.
If the CDU displays a message, take the appropriate action.
If the ALIGN light flashes at the end of the alignment phase :
Check the ALIGN IRS prompt on the MCDU. If it is present, press it to initialize the ADIRS.
If the REALIGN IRS prompt is present :
The position sent to the ADIRS disagrees with the last memorized position, or with the
ADIRS estimated latitude.
ADIRS..................................................................................PERFORM FAST ALIGNMENT
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
NAVIGATION
A318/A319/A320/A321 FLEET PRO-SUP-34 P 15/28
FCOM 19 AUG 10
POSITION INITIALIZATION.........................................................CHECK & ENTER AGAIN
If the ALIGN light still flashes, perform a complete alignment of the affected ADIRS.
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 the ADIRS alignment or initialization is not correct, the ALIGN light will flash. If any of the 3
ADIRS indicates an alignment error, the prompt REALIGN IRS appears on the INIT page (instead
of ALIGN IRS).
If the IR FAULT light flashes,
the affected ADIRS can only be used in ATT mode.
If the ALIGN light flashes before the alignment phase is completed :
DISPLAY DATA switch..........................................................................................................STS
If the CDU does not display any message, the position sent to the ADIRS disagrees with the
last memorized position, or with the ADIRS estimated latitude or with the GPS position.. Check
the initialization position, and reenter it.
If the CDU displays a message, take the appropriate action.
If the ALIGN light flashes at the end of the alignment phase :
Check the ALIGN IRS prompt on the MCDU. If it is present, press it to initialize the ADIRS.
If the REALIGN IRS prompt is present :
The position sent to the ADIRS disagrees with the last memorized position, or with the
ADIRS estimated latitude, or with the GPS position..
ADIRS..................................................................................PERFORM FAST ALIGNMENT
POSITION INITIALIZATION.........................................................CHECK & ENTER AGAIN
If the ALIGN light still flashes, perform a complete alignment of the affected ADIRS.
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
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A320机组操作手册FLIGHT CREW OPERATING MANUAL 14(94)
