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EXAMPLE POSTFLIGHT REPORT......................................................................................................................7/8
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
PRELIMINARY PAGES - TABLE OF CONTENTS
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FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - POSITION COMPUTATION
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GENERAL
Applicable to: ALL
Each FMGEC computes its own aircraft position (called the "FM position") from a MIX IRS position
and a computed radio position or GPS position.
The FMGES selects the most accurate position, considering the estimated accuracy and integrity of
each positioning equipment.
GPS/INERTIAL is the basic navigation mode, provided GPS data is valid and successfully tested.
Otherwise, navaids plus inertial or inertial only are used. (Refer to DSC-22_20-20-10 Navigation
Modes).
MIX IRS POSITION
Applicable to: ALL
Each FMGEC receives a position from each of the three IRSs, and computes a mean-weighted
average called the "MIX IRS" position.
If one of the IRSs drifts abnormally, the MIX IRS position uses an algorithm that decreases the‐
influence of the drifting IRS within the MIX IRS position.
If one of the IRSs fails, each FMGEC uses only one IRS (onside IRS or IRS3). Each IRS position‐
and inertial speed are continuously tested. If the test fails, the corresponding IRS is rejected.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - POSITION COMPUTATION
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GPS POSITION
Applicable to: ALL
Each IRS computes a mixed IRS/GPS position called the GPIRS position. For this, each IRS can
independently select their GPS source in order to maximize the availability of GPS data. Of the three
GPIRS positions that each FMGEC receives, the FMS selects one GPIRS position based on a figure
of merit and priority.
The FMS uses the following hierarchy to perform the selection:
Onside GPIRS position‐
GPIRS 3‐
Opposite GPIRS position.‐
If the GPIRS data does not comply with an integrity criterion that is based on a Horizontal Integrity
Limit (HIL) and on the automatic detection of failed satellites, the FMS rejects the GPS mode and
uses the radio position update.
The flight crew can deselect/select the GPS position on the SELECTED NAVAIDS page, if
necessary.
Information about the GPS position is displayed on the GPS MONITOR page.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - POSITION COMPUTATION
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FCOM 19 AUG 10
RADIO POSITION
Applicable to: ALL
Each FMGEC uses onside navaids to compute its own radio position. These navaids are displayed
on the SELECTED NAVAIDS page.
The available navaids are:
DME/DME‐
VOR/DME‐
LOC‐
DME/‐DME-LOC
VOR/DME‐-LOC.
It uses LOC to update the lateral position, using LOC beam during ILS approach.
LOC is also used for quick update, when in GPS/IRS mode.
If one or more navaids fail, each FMGEC can use offside navaids to compute the VOR/DME or
DME/DME radio position.
The radio navaid selection is displayed on the DATA "SELECTED NAVAIDS" page.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - POSITION COMPUTATION
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FCOM 19 AUG 10
(1) VOR/DME selection (auto or manual) for display (onside VOR).
(2) DMEs automatic selection for DME/DME onside radio position.
(3) ILS selection (auto or manual) for LOC update computation.
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.
I‐n flight, the FM position approaches the radio position, or the GPS position at a rate that depends
upon the aircraft altitude.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - POSITION COMPUTATION
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FCOM 19 AUG 10
For each IRS, the FMGECs compare the FM position with the IRS position. When this difference
　
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