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3. For display purposes:
A specified navaid for the active flight leg‐
The “TO” waypoint (TO WPT), if it is a navaid‐
The “FROM” waypoint (FROM WPT), if it is a navaid‐
A waypoint farther along the flight path, if it is a navaid‐
The navaid closest to the current position of‐ the aircraft.
The scratchpad displays “SPECIFIC VOR-D UNAVAIL” if the VOR or the VOR/DME that the flight
crew requires for tuning is deselected.
Note: If the manual selection of a VOR does not agree with the VOR requested for automatic
tuning, the related MCDU displays : “TUNE BBB CRS XXX” (BBB = ident of the requested
VOR) ; (XXX = course of the requested VOR)
DME
Applicable to:
Each FMGEC automatically uses its five DME frequencies as follows:
One DME frequency for display. It is possible to tune it manually or automatically.‐
Two DME frequencies in DME/DME mode to calculate the radio position of the aircraft. The‐
FMGEC automatically tunes these as a function of their best accuracy. The flight crew does not
receive any indication that this process is happening.
One DME frequency automatically tuned for radio position. This occurs in the VOR/DME mode‐
when the DME/DME is not available and the flight crew complies with the conditions for a
VOR/DME update. In this case, the VOR/DME that the flight crew uses for display is identical to
the VOR/DME navaid used for computation of the radio position.
One DME frequency connected to ILS/DME.‐
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 3/6
FCOM 19 AUG 10
DME
Applicable to: ,
Each FMGEC automatically uses its four DME frequencies as follows:
One DME frequency for display. It is possible ‐to tune it manually or automatically. This DME
frequency is also used for computation of the VOR/DME position.
Two DME frequencies in DME/DME mode to calculate the radio position of the aircraft. The‐
FMGEC automatically tunes these as a function of their best accuracy. The flight crew does not
receive any indication that this process is happening.
One DME frequency connected to ILS/DME.‐
ADF
Applicable to: ALL
The FMGEC automatically tunes one ADF in any area if the "TO" or "FROM" waypoint is a Non
Directional Beacon (NDB), or in approach when the flight plan specifies an NDB approach and a
fix in the approach is the "TO" waypoint. The scratchpad displays “SPECIFIC NDB UNAVAIL” if the
NDB that the flight crew requires for automatic tuning is deselected.
ILS/MLS
Applicable to: ALL
Each FMGEC automatically tunes one ILS frequency (and one MLS simultaneously):
In PREFLIGHT or TAKEOFF phase, when the takeoff runway has an associated ILS/MLS‐
In CLIMB, CRUISE, DESCENT, APPROACH, or GO‐-AROUND phase, when the type of approach
in the flight plan is ILS/MLS
When the direct distance to the desti‐nation is less than 300 nm.
The scratchpad displays “RWY/LS MISMATCH”, when the flight crew has manually tuned the ILS,
and the entered frequency disagrees with the LS or LOC IDENT/FREQ requested for autotuning.
SELECTION OF NAVAIDS ON MCDU PAGES
Applicable to: ALL
The MCDU displays the navaids tuned by the FMGEC on two pages:
The RADIO NAV page‐
The SELECTED NAVAIDS page.‐
THE RADIO NAV PAGE
This page shows which navaids have been automatically or manually tuned for display.
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 4/6
FCOM 19 AUG 10
THE SELECTED NAVAIDS PAGE
This page lists the navaids tuned by the onside FMGEC. No navaids can be modified on this page.
The flight crew can deselect up to 6 unreliable navaids for the whole flight (using 1R key).
MANUAL TUNING
Applicable to: ALL
WRITE the identifier on the RAD NAV page.
Preferably use the identifier.
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 5/6
FCOM 19 AUG 10
If the MCDU displays "NOT IN DATA BASE":
WRITE the frequency.‐
DISREGARD the ident that comes up in small font on the MCDU.‐
When a frequency is entered in the VOR field, the FMGEC automatically associates the tuned
frequency to the closest navaid identifier with the same frequency, and display it on the RAD
NAV page. This identifier may not be corresponding to the tuned navaid.
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A330/A340机组操作手册 FLIGHT CREW OPERATING MANUAL FCOM 1(57)
