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The FM position is automatically updated at the runway threshold. With FMS2, this automatic position update is inhibited.
IN FLIGHT
The FM position tends to the GPIRS position as long as the GPS satellites are available.
 
SUPPLEMENTARY INFORMATION
NAVIGATION ACCURACY
 
NAVIGATION ACCURACY
The GPS position is characterized by two parameters:
? Integrity
? Accuracy.
Integrity is a direct function of the number of satellites in view of the aircraft. If five or more satellites are in view, several combinations of the satellite signal may be used to process "several positions" and to carry out reasonableness tests on the satellite signals themselves.
Accuracy functions in direct connection with the satellite constellation in view of the aircraft. If the satellites are low on horizon, or not in appropriate positions, accuracy will be poor. It is provided as a "figure of merit".
If the GPS position fulfils both the integrity and the accuracy criteria, GPS PRIMARY is displayed on the MCDU PROG page and the GPS position is the best raw data position available.
SUMMARY
FM POSITION
Flight phase WITHOUT GPS PRIMARY WITH GPS PRIMARY
On ground before Takeoff MIX IRS GP IRS
Takeoff Updated at runway threshold (shift) (1)
In flight With RADIO Tends toward RADIO GP IRS
 Without RADIO MIX IRS + BIAS GP IRS

(1) With FMS2, the FMS position update at takeoff is inhibited, when GPS PRIMARY is active.
USE OF FMS
Applicable to: ALL
The navigation accuracy is managed through several MCDU pages: PROG PAGE
This page indicates the GPS PRIMARY.
The PROG displays the estimated navigation accuracy in green. This provides the EPE, if GPS PRIMARY LOST, or is computed by the GPS, if GPS PRIMARY is displayed
The PROG page displays the required navigation accuracy in blue (this can be changed). The required navigation accuracy thresholds are determined, depending on the flight phase, or can be manually entered. These thresholds are used to change from HIGH to LOW accuracy, or vice versa. These indications are used when flying within RNP airspace.
SELECTED NAVAIDS PAGE
The SELECTED NAVAID page is accessible from DATA/POSITION MONITOR/ FREEZE/SEL NAVAIDS. It has a DESELECT prompt, that enables the flight crew to prevent the FMS from using
 
SUPPLEMENTARY INFORMATION
NAVIGATION ACCURACY
 
the GPS data to compute the position, in the case of a major problem. GPS PRIMARY lost is then displayed on MCDU and ND. The GPS can be reselected using the same page.
PREDICTIVE GPS PAGE (IRS HONEYWELL ONLY)
The PREDICTIVE GPS page is accessible from PROG page. The GPS PRIMARY criteria depend upon the satellite constellation status (position and number) and this is predictable. The crew can assess the GPS PRIMARY status at destination or alternate.
　
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