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If the closest navaid found in the database is of a different type (e.g. VOR instead of
VOR/DME), the flight crew will obtain a partial tuning (e.g. VOR indication instead of
VOR/DME indication).
NAVAID IDENTIFICATION
Applicable to: ALL
CHECK the decoding of the ILS identifier on PFD and the VOR or ADF identifier on ND.
When the navaid identifier is decoded in agreement with that published, no audio check is necessary.
When the decoding is different from the published one, check the audio. Due to Morse coding
inaccuracy, wrong decoding may sometimes occur.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - RADIO NAVIGATION TUNING
A330/A340 FLEET DSC-22_20-20-30 P 6/6
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - ALIGNMENT OF INERTIAL REFERENCE SYSTEM
A330/A340 FLEET DSC-22_20-20-40 P 1/6
FCOM 19 AUG 10
ALIGNMENT OF INERTIAL REFERENCE SYSTEM
Applicable to:
The FMGES uses the reference point coordinates of the departure airport to align the IRS.
It automatically calls these up from the database 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
manually adjust these coordinates to the gate position. A normal alignment takes 10 min, a fast
alignment takes 30 s.
A fast alignment is used to refine a position when time is limited.
Note: If the "IRS IN ALIGN" memo flashes during the alignment, this indicates that:
It has detected excessive motion (it automatically‐ restarts the alignment), or
It has detected a mismatch between the position the MCDU has sent to the IRS and the‐
last memorized IRS position, or
It has detected a mismatch between the latitude the flight crew has entered (which‐
is sent by the MCDU to the IRS) and the latitude the IRS has computed during the
alignment.
ALIGNMENT OF INERTIAL REFERENCE SYSTEM
Applicable to:
The FMGES uses the reference point coordinates of the departure airport to align the IRS.
It automatically calls these up from the database 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
manually adjust these coordinates to the gate position. A normal alignment takes 10 min, a fast
alignment takes 30 s.
A fast alignment is used to refine a position when time is limited.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - ALIGNMENT OF INERTIAL REFERENCE SYSTEM
A330/A340 FLEET DSC-22_20-20-40 P 2/6
FCOM 19 AUG 10
Note: If the "IRS IN ALIGN" memo flashes during the alignment, this indicates that:
It has detected excessive motion (it automatically restarts the alignment), or‐
It has detected a mismatch between the position the MCDU has sent to the IRS and the‐
last memorized IRS position, or
It has detected a mismatch between the latitude the fl‐ight crew has entered (which
is sent by the MCDU to the IRS) and the latitude the IRS has computed during the
alignment.
ALIGNMENT OF INERTIAL REFERENCE SYSTEM
Applicable to: ,
The preferred way of initializing the ADIRS is to use the GPS position, because this does not require
any flight crew intervention. Less than 1 min after setting the ADIRS to NAV, the INIT page displays
the GPS position without displaying the ALIGN IRS prompt.
If the flight crew enters a CO RTE or FROM/TO, the INIT page displays the departure airport
reference-point coordinates, and the ALIGN IRS prompt appears. If this prompt key is not pressed,
the ADIRS is initialized to the GPS position at the end of the alignment time.
At any time during the alignment, the flight crew can manually adjust the coordinates displayed on
the INIT page. The ALIGN IRS prompt reappears.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - ALIGNMENT OF INERTIAL REFERENCE SYSTEM
A330/A340 FLEET DSC-22_20-20-40 P 3/6
FCOM 19 AUG 10
If the ALIGN IRS prompt key is pressed, the coordinates displayed on the INIT page are sent to the
ADIRS for initialization. This is the alternate method for ADIRS initialization, when the GPS position
is not available.
A normal alignment takes between 5 and 10 min (depending on the local latitude). At latitudes
between 73° and 82° (North or South), the alignment takes about 17 min. The ADIRS cannot be
aligned beyond 82° (North or South).
A fast alignment takes about 30 s, and it is used for improving the ADIRS initial position accuracy,
　
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