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exceeds a threshold (depending on the elapsed time since IRS alignment), the "CHECK IRS (1, 2 or
3)/FM POSITION" message is displayed on the MCDUs.
When the FWC detects an abnormal IRS drift, the ECAM triggers the "FM/IR POSITION DISAGREE"
message.
BIAS
Each FMGEC computes a vector from its MIX IRS position to the radio or GPIRS position. This
vector is called the "bias".
Each FMGEC continuously updates its bias, if a radio position, or a GPIRS position is available.
If an FMGEC 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 manually update the FM position. This also updates the bias.
FM POSITION
Applicable to: ,
At flight initialization, each FMGEC displays an FM position that is the mixed IRS/GPS position
(GPIRS):
At takeoff, the FM position is updated to the runway threshold position, as stored in the database‐
and corrected by the takeoff shift when entered by the flight crew.
In flight, the FM position approaches the radio position, or the GPS position at a ra‐te that depends
upon the aircraft altitude.
Note: The FM position update at takeoff is inhibited when GPS PRIMARY is active.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - POSITION COMPUTATION
A330/A340 FLEET DSC-22_20-20-10 P 6/10
FCOM 19 AUG 10
For each IRS, the FMGECs compare the FM position with the IRS position. When this difference
exceeds a threshold (depending on the elapsed time since IRS alignment), the "CHECK IRS (1, 2 or
3)/FM POSITION" message is displayed on the MCDUs.
When the FWC detects an abnormal IRS drift, the ECAM triggers the "FM/IR POSITION DISAGREE"
message.
BIAS
Each FMGEC computes a vector from its MIX IRS position to the radio or GPIRS position. This
vector is called the "bias".
Each FMGEC continuously updates its bias, if a radio position, or a GPIRS position is available.
If an FMGEC 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 manually update the FM position. This also updates the bias.
POSITION MONITOR
Applicable to:
The flight crew may check the position computation using the GPS MONITOR or POSITION
MONITOR page.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - POSITION COMPUTATION
A330/A340 FLEET DSC-22_20-20-10 P 7/10
FCOM 19 AUG 10
POSITION MONITOR
Applicable to: ,
The flight crew may check the position computation using the GPS MONITOR or POSITION
MONITOR page.
TAKEOFF UPDATE
Applicable to:
A takeoff update requires that the takeoff runway be part of the flight plan. This provides the most
accurate position update.
If the takeoff run starts at an intersection, enter a takeoff shift on the PERF TO page to refine the
takeoff update.
An accurate takeoff update ensures a precise aircraft position during departure.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - POSITION COMPUTATION
A330/A340 FLEET DSC-22_20-20-10 P 8/10
FCOM 19 AUG 10
TAKEOFF UPDATE (GPS PRIMARY NOT ACTIVE)
Applicable to: ,
A takeoff update requires that the takeoff runway be part of the flight plan. This provides the most
accurate position update.
If the takeoff run starts at an intersection, enter a takeoff shift on the PERF TO page to refine the
takeoff update.
An accurate takeoff update ensures a precise aircraft position during departure.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - POSITION COMPUTATION
A330/A340 FLEET DSC-22_20-20-10 P 9/10
FCOM 19 AUG 10
NAVIGATION MODES
Applicable to: ALL
The FMGES updates the FM position via the use of radio navaids or GPS, if available. It can use four
different FM navigation modes to make this update.
The decreasing order of priority is:
IRS‐-GPS
IRS‐-DME/DME
IRS‐-VOR/DME
IRS only.‐
During ILS approaches, the system performs a temporary lateral update, via one of the following
modes:
IRS‐-GPS/LOC
IRS‐-DME/DME-LOC
IRS‐-VOR/DME-LOC
IRS‐-LOC.
A330/A340 FLIGHT CREW
OPERATING MANUAL
　
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