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FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - RADIO NAVIGATION TUNING
A318/A319/A320/A321 FLEET DSC-22_20-20-30 P 1/8
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 FMGC software
‐ Manual tuning via the MCDU RAD NAV page
‐ Manual tuning via the Radio Management Panel (RMP) if both FMGCs or both MCDUs fail.
The FMGS automatically tunes the radio navaids for computation of the radio position.
Note: The manual selection of a VOR or VOR/DME may prevent the FMGS 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 mode and independent mode, each FMGC simultaneously tunes the navaids on its
own side (one VOR, one DME, one ILS and one ADF). In these modes, the flight crew can also
manually tune the VOR (and associated DME), ILS, and ADF.
‐ In single mode, the valid FMGC 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.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - RADIO NAVIGATION TUNING
A318/A319/A320/A321 FLEET DSC-22_20-20-30 P 2/8
FCOM 19 AUG 10
Note: If one radio receiver fails, both FMGCs use the operative radio receiver to compute the
position of the aircraft.
VOR
Applicable to: ALL
Each FMGC may tune only one VOR (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
3. For display purposes:
A navaid ‐ specified 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.
DME
Applicable to:
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Each FMGC 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 for calculating the radio position of the aircraft. The
FMGC 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 that the flight crew uses for computation of the radio position.
‐ One DME frequency is connected to the ILS/DME.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - RADIO NAVIGATION TUNING
A318/A319/A320/A321 FLEET DSC-22_20-20-30 P 3/8
FCOM 19 AUG 10
DME
Applicable to:
Each FMGC 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 VOR/DME position computation.
‐ Two DME frequencies in DME/DME mode for calculating the radio position of the aircraft. The
FMGC 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 ‐ is connected to the ILS/DME.
ADF
Applicable to: ALL
The FMGC automatically tunes one ADF, when the flight plan specifies a Non Directional Beacon
(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
autotuning is deselected.
ILS
Applicable to: ALL
Each FMGC automatically tunes one ILS frequency:
‐ In the PREFLIGHT or TAKEOFF phase, when the takeoff runway has an associated ILS.
‐ In the CLIMB, CRUISE, DESCENT, APPROACH, or GO-AROUND phase, when the type of
　
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