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• 0.7' of longitude, when the aircraft latitude is between 45° and 60°
• 1' of longitude, when the aircraft latitude is between 60° and 70°.
Above 70° of latitude, a longitude difference does not trigger the alarm.
The master caution light comes on, and the single chime sounds. This amber caution is inhibited
during the takeoff phase.
PREDICTIVE GPS PAGE
Applicable to: ALL
The predictive GPS page is only operative with the Honeywell ADIRS equipment. All fields are blank
with Litton ADIRS equipment.
The predictive GPS function predicts the availability of the GPS within ± 15 min of ETA at
destination, or at any waypoint entered by the flight crew.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - EVALUATION OF POSITION ACCURACY
A330/A340 FLEET DSC-22_20-20-20 P 7/8
FCOM 19 AUG 10
Predictions are displayed on the predictive GPS page at time intervals of 5 min (+15 min and -15 min
of ETA).
To access this page, press the 5L key of the PROG page. This page also enables the deselection of
up to 4 satellites at a time.
NAVIGATION ACCURACY CHECK
Applicable to: ALL
When GPS PRIMARY is available, the navigation accuracy check is not required.
When GPS PRIMARY is not available, the flight crew must perform this essential check:
Periodically in cruise‐
At 10 000 ft in descent.‐
When entering a terminal/approach area, the flight crew must monitor navigation accuracy only.
The procedure is:
While e‐n route, check the HIGH/LOW accuracy information.
• If accuracy is "LOW" (and whenever "NAV ACCUR DOWNGRAD" appears), compare raw data
from the tuned navaids with the corresponding FM computed data on the ND or the MCDU
PROG page
• If accuracy is "HIGH", periodically perform the comparison (about once per hour).
In descent and in terminal and approach areas, validate the estimated accuracy, whether it‐
is "HIGH" or "LOW", by comparing the FM data with the raw data from the VOR/DME at the
destination airfield, if available.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - EVALUATION OF POSITION ACCURACY
A330/A340 FLEET DSC-22_20-20-20 P 8/8
FCOM 19 AUG 10
This check verifies and quantifies the FM accuracy. It confirms the reliability of FMGES data itself
and of the navigation display presentation. This check also validates the use of the NAV mode.
By comparing the bearing, the flight crew may evaluate the validity of the overall check. In area with
high magnetic variation change, this comparison of bearings may not be adequate.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - RADIO NAVIGATION TUNING
A330/A340 FLEET DSC-22_20-20-30 P 1/6
FCOM 19 AUG 10
GENERAL
Applicable to: ALL
Radio navaids are tuned for two different purposes: Display and computation.
It is possible to perform tuning for display in three different ways:
Automatic tuning via FMGEC software‐
Manual tuning via the MCDU RAD NAV‐
Manual tuning via the Radio Management Panel (RMP) if both FMGECs or both MCDUs fail.‐
The FMGES automatically tunes the radio navaids for computation of the radio position.
Note: The manual selection of a VOR or VOR/DME may prevent the FMGES from automatically
tuning a VOR/DME to compute position. In this case, the related MCDU displays “TUNE
BBB FFF.FF” (BBB = ident, FFF.FF = frequency).
ARCHITECTURE
Applicable to: ALL
In dual m‐ode and independent mode, each FMGEC simultaneously tunes the navaids on its own
side (one VOR, one DME, one ILS/MLS, and one ADF). In these modes, the flight crew can also
manually tune the VOR (and associated DME), the ILS/MLS, and the ADF.
In single m‐ode, the valid FMGEC tunes navaids on both sides. The flight crew can also use the
RAD NAV page to manually tune both VORs, both ADFs and the ILS.
Manual tuning has priority over automatic tuning.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - RADIO NAVIGATION TUNING
A330/A340 FLEET DSC-22_20-20-30 P 2/6
FCOM 19 AUG 10
Note: If one radio receiver fails, both FMGECs use the operative radio receiver to compute the
position of the aircraft.
VOR
Applicable to: ALL
Each FMGEC may tune one VOR only (manually or automatically).
Automatic tuning complies with the following priorities for tuning the VOR:
1. The specified navaid for the approach
2. The navaid that the flight crew should use to compute the current radio position
　
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