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(2) DMEs automatic selection for DME/DME onside radio position.
(3) ILS selection (auto or manual) for LOC update computation.
CHECK A/C POSITION MESSAGE
Applicable to:
This message comes up on the MCDU, when the radio position and the IRS position disagree by
more than 12 nm.
FM POSITION
Applicable to:
At flight initialization, each FMGC displays an FM position that is a MIX IRS position:
At takeoff, the FM position is updated to the runway threshold position ‐ as stored in the database
and corrected of the takeoff shift when entered by the flight crew
‐ In flight, the FM position approaches the radio position at a rate depending upon the aircraft
altitude.
BIAS
Each FMGC computes a vector from its MIX IRS position to the radio position. This vector is called
the “bias”.
Each FMGC updates its bias continuously as long as a radio position is available.
When the radio position is lost, the bias is no longer updated and remains unchanged until the
radio position is restored.
During this period, the FM position is the current MIX IRS position corrected by the last bias.
The flight crew can update the FM position manually. This also updates the bias.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - POSITION COMPUTATION
A318/A319/A320/A321 FLEET DSC-22_20-20-10 P 9/16
FCOM 19 AUG 10
FM POSITION
Applicable to:
At flight initialization, each FMGC displays an FM position that is a MIX IRS/GPS position (GPIRS):
‐ At takeoff, when the FM position is updated to the runway threshold position as stored in the
database, possibly corrected by the takeoff shift entered on PERF TO page.
‐ In flight, the FM position approaches the radio position or the GPS position at a rate depending
upon the aircraft altitude.
BIAS
Each FMGC computes a vector from its MIX IRS position to the radio position or GPIRS position.
This vector is called the “bias”.
Each FMGC updates its bias continuously as long as a radio position or a GPIRS position is
available.
If an FMGC loses its radio/GPIRS position, it memorizes the bias and uses it to compute the FM
position, which equals the MIX IRS position plus the bias. Until the radio or the GPIRS position is
restored, the bias does not change.
The flight crew can update the FM position manually. This also updates the bias.
FM POSITION
Applicable to:
,
,
MSN,,,,
At flight initialization, each FMGC displays an FM position that is a MIX IRS/GPS position (GPIRS):
At takeoff, when the FM position is updated to the runway threshold ‐ position as stored in the
database, possibly corrected by the takeoff shift entered on PERF TO page.
‐ In flight, the FM position approaches the radio position or the GPS position at a rate depending
upon the aircraft altitude.
Note: The FM position update at takeoff is inhibited when GPS PRIMARY is active.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - POSITION COMPUTATION
A318/A319/A320/A321 FLEET DSC-22_20-20-10 P 10/16
FCOM 19 AUG 10
BIAS
Each FMGC computes a vector from its MIX IRS position to the radio position or GPIRS position.
This vector is called the “bias”.
Each FMGC updates its bias continuously as long as a radio position or a GPIRS position is
available.
If an FMGC loses its radio/GPIRS position, it memorizes the bias and uses it to compute the FM
position, which equals the MIX IRS position plus the bias. Until the radio or the GPIRS position is
restored, the bias does not change.
The flight crew can update the FM position manually. This also updates the bias.
POSITION MONITOR
Applicable to:
The flight crew may check the position computation using the POSITION MONITOR page.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - POSITION COMPUTATION
A318/A319/A320/A321 FLEET DSC-22_20-20-10 P 11/16
FCOM 19 AUG 10
POSITION MONITOR
Applicable to:
The flight crew may check the position computation using the GPS MONITOR or POSITION
MONITOR page.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - POSITION COMPUTATION
A318/A319/A320/A321 FLEET DSC-22_20-20-10 P 12/16
FCOM 19 AUG 10
POSITION MONITOR
Applicable to:
The flight crew may check the position computation using the GPS MONITOR or POSITION
MONITOR page.
A318/A319/A320/A321 FLIGHT CREW
　
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