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one of the following:
‐ It has detected excessive motion. (It automatically restarts the alignment).
‐ It has detected a disagreement between the position the MCDU has sent to the IRS,
and the last memorized IRS position. The flight crew must enter new coordinates in the
MCDU, and realign the IRS.
‐ It has detected a disagreement between the latitude the MCDU has sent to the IRS, and
the latitude the IRS has computed during the alignment.
‐ The IRS has not received a position from the MCDU or the ADIRS overhead CDU.
ALIGNMENT OF INERTIAL REFERENCE SYSTEM
Applicable to:
The FMGS uses the reference point coordinates of the departure airport to align the IRS.
It calls these up from the database automatically after the flight crew has entered a company route
or an origin-destination city pair and pressed the ALIGN IRS key on the MCDU. The flight crew can
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - ALIGNMENT OF INERTIAL REFERENCE SYSTEM
A318/A319/A320/A321 FLEET DSC-22_20-20-40 P 2/4
FCOM 19 AUG 10
adjust these coordinates manually to the gate position. A normal alignment takes 10 min, a fast
alignment 30 s.
Fast alignment is used to refine a position when time is limited.
Note: If "ALIGN" flashes on the ADIRS overhead CDU during the alignment process, it indicates
one of the following:
It has detected excessive motion. (It automatically ‐ restarts the alignment).
‐ It has detected a disagreement between the position the MCDU has sent to the IRS,
and the last memorized IRS position. The flight crew must enter new coordinates in the
MCDU, and realign the IRS.
‐ It has detected a disagreement between the latitude the MCDU has sent to the IRS, and
the latitude the IRS has computed during the alignment.
‐ The IRS has not received a position from the MCDU or the ADIRS overhead CDU.
ALIGNMENT OF INERTIAL REFERENCE SYSTEM
Applicable to:
The flight crew accesses the page dedicated to IRS alignment by pressing the [3R] key.
The FMGS uses the reference point coordinates of the departure airport to align the IRS. The flight
crew can manually adjust these coordinates to the gate position. A normal alignment takes 10 min
and a fast alignment takes 30 s.
Fast alignment is used to refine a position, when time is limited.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - ALIGNMENT OF INERTIAL REFERENCE SYSTEM
A318/A319/A320/A321 FLEET DSC-22_20-20-40 P 3/4
FCOM 19 AUG 10
Note: If "ALIGN" flashes on the ADIRS overhead CDU during the alignment process, it indicates
one of the following:
‐ It has detected excessive motion. (It automatically restarts the alignment).
‐ It has detected a disagreement between the position the MCDU has sent to the IRS,
and the last memorized IRS position. The flight crew must enter new coordinates in the
MCDU, and realign the IRS.
‐ It has detected a disagreement between the latitude the MCDU has sent to the IRS, and
the latitude the IRS has computed during the alignment.
‐ The IRS has not received a position from the MCDU or the ADIRS overhead CDU.
ALIGNMENT OF INERTIAL REFERENCE SYSTEM
Applicable to:
,
,
MSN,,,
4617,
The flight crew accesses the page dedicated to IRS alignment by pressing the [3R] key.
The FMGS uses the reference point coordinates of the departure airport to align the IRS. The flight
crew can manually adjust these coordinates to the gate position. A normal alignment takes 10 min
and a fast alignment takes 30 s.
Fast alignment is used to refine a position, when time is limited.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - ALIGNMENT OF INERTIAL REFERENCE SYSTEM
A318/A319/A320/A321 FLEET DSC-22_20-20-40 P 4/4
FCOM 19 AUG 10
Note: If the “IRS IN ALIGN” memo flashes on the E/WD during the alignment process, it indicates
one of the following:
It has detected excessive motion. (It automatically ‐ restarts the alignment).
‐ It has detected a disagreement between the position the MCDU has sent to the IRS,
and the last memorized IRS position. The flight crew must enter new coordinates in the
MCDU, and realign the IRS.
‐ It has detected a disagreement between the latitude the MCDU has sent to the IRS, and
the latitude the IRS has computed during the alignment.
‐ The IRS has not received a position from the MCDU .
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
　
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