NORMAL OPERATIONS
PRE START
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL
? To observe any possible abnormalities on the landing gear status:
‐ Wheels and tires status (cut, wear, cracks)
‐ Safety pins are removed
‐ Brakes status (Brake wear pin length with parking brake ON)
‐ Length of oleo. Any difference between the two main landing gears shall be reported.
? To observe any possible abnormality on the engines:
‐ Fan blades, turbine exhaust, engine cowl and pylon status
‐ Access door closed
ADIRS INITIALIZATION
Criteria: SA
3 Applicable to: MSN 0045-2629
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).
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
NORMAL OPERATIONS
PRE START
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL
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.
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