C. Radio Navigation Tuning
 (1)
 General
 The navaid selection includes tuning of the following sensors:

 -VOR (frequency/course) and DME for display
 -ILS (frequency/LOC course)
 -ADF (frequency/BFO).
 (Ref. Fig. 012)
 There are three ways of selection which are:

 -RMP selection (Radio Management Panel)
 -manual selection through the MCDU
 -automatic selection (in FMGC software).
 The priority order of selection is as follows:

 -
manual selection through the RMP

 -
manual selection through the MCDU cannot override RMP selection

 -automatic selection cannot override manual selection through the MCDU and RMP selection.

 (2)
 RMP selection (Ref. 23-13-00) The RMP selection in the radio nav architecture has to be considered as a back-up of selection. It is activated/de-activated upon selection of the nav mode for the RMP (NAV pushbutton switch). Since then, the pilot may select:

 -VOR (frequency and course)
 -ILS (frequency and LOC course)
 -ADF (frequency and ADF BFO).

 Class of Navigation
 Figure 011

 Radio Navigation Architecture
 Figure 012

 If selection of any RMP is active, neither the pilot nor the FMGCs
 can tune the radio frequencies on both sides.
 For display, the selected VOR - ADF are shown on the navigation
 display with a character R near the ident or frequency to indicate
 that the navaid selection mode is RMP.
 (Ref. Fig. 013)
 On the MCDU, the RMP select navaids are displayed on the RADIO NAV
 page or PROG page in green small fonts.

 (3) Manual selection through the MCDU Selection through the MCDU is possible through two pages : RADIO NAV page and PROG page. (Ref. Fig. 014)
 (a) VOR tuning On RADIO NAV page, the pilot may select for display a VOR by ident or frequency in line 1L, 1R. He may also optionally enter a course in line 2L, 2R. Upon modification of the selected VOR, the course is automatically cleared. On PROG page, the pilot may select a VOR as he does on RADIO NAV page except that he cannot enter a course. Manually selected navaids are displayed in cyan large fonts on the MCDU and on the navigation display there is a character M near the navaid ident or frequency. (Ref. Fig. 015)
 -Selection mechanization If ident entry is made, the nav data base is searched and if there is a match, the FMGC outputs the frequency. If not, NEW NAVAID page is displayed. If frequency is entered, the ident field is filled if found in data base. If not, brackets are displayed. If the VOR field is cleared, the display reverts to autotuned navaid with associated course (if any). If the navaid has been deselected (Ref. Para. A.(7)) on SELECTED NAVAIDS page, then a message is displayed (XXXX IS DESELECTED).
 -Dual/independent/single modes In dual operation, the onside information is supplied by the onside FMGC, while the offside information is supplied by the offside FMGC, but both side information can be selected on either MCDU. In independent operation, the offside field of each MCDU is blank and nothing can be entered in that field. If one FMGC fails, the dual operation remains valid on both MCDUs (single operation). Onside and offside information is supplied by the remaining FMGC.

 RMP Selection-ND Display
 Figure 013

 Manual Selection through RADIO NAV Page and PROG Page
 Figure 014

 Manual Selection through MCDU-ND Display
 Figure 015

 These rules also apply for ADF selection (Ref. Para. (c)).
 (b)
 ILS tuning On RADIO NAV page only, the pilot may select an ILS by frequency or ident in field 3L. The entry mechanization is the same as for VOR. However upon entry of an ILS by frequency, this frequency is compared :

 -In preflight and takeoff phases to the ILS frequency at origin
 -else to the ILS frequency at destination. In both cases, if a match is found, the ident and frequency are displayed (cyan small fonts for the ident, cyan large fonts for the frequency). If not, only the frequency is displayed (in cyan large fonts) and a message appears in scratchpad RWY/ILS MISMATCH. In field 4L, the pilot may select the LOC course. This will be used for LOC capture and ILS guidance in approach. This LOC course may only be entered through the MCDU on the RADIO NAV page. It is cleared if the pilot changes the selected ILS.

 (c)
 ADF tuning With the same mechanization as for VOR, the pilot may select an ADF by ident or frequency in line 5L, 5R. Since the second ADF is an aircraft option (program pin on FMGC), the second ADF is available only when this option is valid. When an ADF is selected, the ADF BFO prompt appears in line 6. Selection of the BFO operation by pressing the LS key displays the prompt ADF BFO and activates the BFO function for the current ADF frequency selection. The BFO operation is deactivated by clearing the associated field. The display reverts to ADF BFO. It is also deactivated by entering a new ADF frequency or ident.
　
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