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NORMAL OPERATIONS
PRE START
 
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). A complete re-alignment 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.
 
NORMAL OPERATIONS
PRE START
 
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
　
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本文鏈接地址：A330/A340 機組訓練手冊 FCTM Flight Crew Training Manual 1(33)