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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 detec‐ted 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 GPS position and the position entered by the‐
flight crew, or
It has detected a mismatch between the latitude‐ the flight crew has entered (which is
sent by the MCDU to the IRS) or the GPS latitude and the latitude the IRS has computed
during the alignment.
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 4/6
FCOM 19 AUG 10
IR IN ATT MODE: HDG SET
Applicable to: ALL
When one IRS at least is in ATT mode, the flight crew must set and periodically update the heading
to have an attitude information. The entry is performed on the MCDU IRS MONITOR page.
AVERAGE DRIFT COMPUTATION
Applicable to: ALL
The FMGEC computes an average drift on the ground at the end of the flight for each IR. This drift is
then displayed on the IRS page.
The drift is the difference between the IR position at landing and the geographic landing position
(destination runway threshold plus a shift of 400 m).
The FMGEC then computes the time since last alignment.
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 5/6
FCOM 19 AUG 10
POLAR NAVIGATION
Applicable to:
The IRS can provide the MAG HEADING between latitudes 82°30'N and 60°30'S, except in the
vicinity of North magnetic pole.
The FMGEC computes the aircraft position within polar area even at the North pole by using the MIX
IRS position.
Note: The IRS may be aligned up to latitude 73°N, without using a specific procedure.
Between 73° and 82° (North or South), the required alignment time is longer and a specific
procedure has to be performed. Beyond 82° North or South, no ADIRS alignment is
possible.
As a general rule, the MCDU displays all parameters referenced to North, depending on the position
of the NORTH REF pb-sw.
In order to provide the SAFEST and most FLEXIBLE operation, a MAG/TRUE NORTH REF pb-sw is
available, with various messages provided on the EFIS ND, the MCDU, and the ECAM, indicating to
the flight crew what reference should be applicable in the flight area the aircraft is located.
POLAR NAVIGATION
Applicable to: ,
The IRS can provide the MAG HEADING between latitudes 82°30'N and 60°30'S, except in the
vicinity of North magnetic pole.
The FMGEC computes the aircraft position within polar area even at the North pole by using the MIX
IRS position.
Note: The IRS may be aligned up to latitude 73°N, without using a specific procedure.
Between 73° and 82° (North or South), the required alignment time is longer. Beyond 82°
North or South, no ADIRS alignment is possible.
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 6/6
FCOM 19 AUG 10
As a general rule, the MCDU displays all parameters referenced to North, depending on the position
of the NORTH REF pb-sw.
In order to provide the SAFEST and most FLEXIBLE operation, a MAG/TRUE NORTH REF pb-sw is
available, with various messages provided on the EFIS ND, the MCDU, and the ECAM, indicating to
the flight crew what reference should be applicable in the flight area the aircraft is located.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - NAVIGATION DATABASE
A330/A340 FLEET DSC-22_20-20-50 P 1/2
FCOM 19 AUG 10
GENERAL
Applicable to: ALL
Overall navigation performance is mainly based on two elements:
The accuracy of the aircraft position calculation‐
The validity of the flight path definition, as extracted from the navigation database.‐
The level of validation depends on the type of operations. For example, JAA TGL 10 requires that, for
Precision RNAV in terminal area, providers and operators implement a quality assurance program for
the navigation database, which may include a navigation database validation process. The highest
level of validation is required for RNAV approach, with lateral and vertical navigation.
The navigation databases are revised every 28 days (ARINC cycle). Flights should be conducted
　
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