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is only recommended for Long-range flights, especially if flown outside radio NAVAID coverage
with Aircraft not equipped with GPS.
INITIALIZATION
The F-PLN origin airport coordinates are extracted from the FMS database. These coordinates
appear on the MCDU INITA page, and are normally used for initialization. They are the airport
reference coordinates.
If a high navigation performance is desired, (i.e. for long-range flights without GPS and without
radio navigation updates, or if low RNP operation is expected), the crew should adjust the airport
reference coordinates to the gate coordinates, provided that this data is published or available
on board. In this case, the flight crew should use the slew keys successively for Latitude and
Longitude, instead of inserting the coordinates on the scratchpad, (in order to avoid errors).
When performing the BEFORE START C/L, the flight crew will check that the IRS IN ALIGN
ECAM MEMO no longer appears, to indicate that the ADIRS are in NAV mode.
The crew will check on the POSITION MONITOR page, that the distance between IRS and FMS
position is lower than 5 nm. This will permit to detect any gross error for IRS initialization, which is
not visible as long as GPS PRIMARY is available.
Checking runway and SID display on the ND in comparison with the aircraft symbol representing
the aircraft present position, (ARC or NAV mode, range 10 nm) during taxi, is a good way to check
the global consistency of FMGS entries (Position and flight plan).
"RESET IRS TO NAV" MCDU MESSAGE
When the ADIRS are in NAV mode, and new origin airport coordinates are inserted, the RESET
IRS TO NAV message triggers.
This occurs in transit, when the flight crew enters a new CO-RTE, or enters a new FROM-TO
airport pair on the INIT A page, and does not re-align the ADIRS.
In this case, check the coordinates on the INITA page and compare them with:
• The coordinates of the origin airport, that are provided on the Airport chart, in order to detect a
possible error in airport entry
• The ADIRS position (IRS monitor page).
In most cases the ADIRS position and the airport position do not differ significantly. Therefore, the
message may be cleared without realigning the IRSs.
A330/A340 FLIGHT CREW TRAINING MANUAL
NORMAL OPERATIONS
PRE START
A330/A340 FLEET NO-020 P 7/14
FCTM 17 JUN 09
ADIRS INITIALIZATION
Criteria: S16762, S16804, LR
Applicable to: , , , , , , , , , , , , , ,
, , , , ,
ALIGNMENT
At the beginning of the pre-flight checks, the crew sets the ADIRS selectors to NAV, in order
to start alignment. The alignment takes approximately 10 min, and must be completed before
pushback (before any aircraft movement).
IN TRANSIT:
ADIRS re-alignment is only necessary, if one of the ADIRS displays a residual ground speed
greater than 5 kt.
In this case, a rapid re-alignment should be performed on all 3 IRSs (by setting all the ADIRS
to OFF, then all back to ON within 5 s). The fast alignment takes approximately one minute.
It involves setting the ground speed to 0, and updating the IRS position to the position of the
coordinates on the INITA page (usually airport reference coordinates).
INITIALIZATION
The ADIRS are automatically initialized at the GPS position. These GPS coordinates are displayed
on the MCDU INIT A page, in replacement of the airport reference coordinates, after the pilot
entered the FROM-TO city pair.
When performing the BEFORE START C/L, the crew will check that the IRS IN ALIGN ECAM
MEMO has disappeared, as a confirmation that the ADIRS are in NAV mode.
Checking runway and SID display on the ND in comparison with the aircraft symbol representing
the aircraft present position, (ARC or NAV mode, range 10 nm) during taxi, is a good way to check
the global consistency of FMGS entries (Position and flight plan).
"RESET IRS TO NAV" MCDU MESSAGE
When the ADIRS are in NAV mode, and new origin airport coordinates are inserted, the RESET
IRS TO NAV message triggers. This occurs, in transit, when the crew performs a fast alignment,
since this fast alignment is usually completed before the crew enters the FROM-TO airport pair.
Check the validity of the IRS initialization, before clearing this message.
A330/A340 FLIGHT CREW TRAINING MANUAL
NORMAL OPERATIONS
PRE START
A330/A340 FLEET NO-020 P 8/14
FCTM 17 JUN 09
COCKPIT PREPARATION
Applicable to: ALL
FLOW PATTERN
The scan pattern varies, depending on the pilot status, i.e PF, PNF, CM1, or CM2, and the areas
of responsibility:
1. Overhead panel: Turn off any white lights
2. Center instrument panel
3. Pedestal
4. FMGS preparation, and when both pilots are seated:
　
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