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Description
The VHF Navigation System is a dual-receiver system used for en route navigation
and for precision approach and landing. Signals from VHF Omni Range (VOR),
Instrument Landing System (ILS) stations and marker beacons are received and
processed. Separate VOR and ILS modes of operation are provided.
The VHF Navigation System consists of two VHF Navigation Receivers and
associated antennas.
Components and Operation
VHF Navigation Receiver
The VOR/LOC receiver operates in the frequency range of 108.0 MHz through 117.95
MHz. The frequencies are spaced 50 kHz apart, giving 200 channels. Forty channels
are designated for Localizer and 150 channels are assigned to VOR. The frequency
range of the Glideslope Receiver is 329.15 to 335.00 MHz. There are 40 channels with
150-kHz spacing. The Localizer and Glideslope channels are paired. The Marker
Beacon operates on a fixed frequency of 75.0 MHz.
The VHF NAV 1 receiver is powered by the DC Essential Bus and VHF NAV 2 by DC
Bus 2.
Nav Tuning
NAV tuning is normally performed from the top level page of the on-side RTU (see
Figure 17-44). Tuning may also be accomplished by the cross-side RTU or by the
FMS CDU.
When the NAV main display page is selected, the sensitivity of the marker beacon
receiver can be controlled via the MKR SENS line select key.
Course Selection and Tracking
The desired VOR/LOC course may be displayed on the PFD horizontal situation
indicator (HSI), by selecting VOR/LOC using the NAV SOURCE knob on the DCP,
and then setting the desired course with the COURSE knob on the Flight Control
Panel (FCP). Pushing the PUSH DIRECT inset button of the COURSE knob on the
FCP sets the VOR course direct to the tuned VOR station.
The VOR/LOC course may also be displayed on the HSI and NAV SECTOR formats
of the MFD.
NAVIGATION SYSTEMS
17-56 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Tracking of the VOR/LOC course is accomplished using the flight director and
autopilot. For more information, see Chapter 4 Automatic Flight Control System.
Bearing Pointer Selection
The BRG pushbuttons on the DCPs allow selection of pilot’s side or copilot’s side
VOR information in the form of bearing pointers. The single magenta bearing pointer
displays the direct bearing to the NAV 1 VOR station. The cyan double bearing pointer
displays the direct bearing to the NAV 2 VOR station.
Both pointers may be displayed simultaneously on either PFD’s HSI, and on the HSI,
NAV SECTOR, and FMS MAP formats of the MFD.
Cross-Side Course Display
The PUSH X-SIDE inset button on the NAV SOURCE knob may be used to display
cross-side course information on the HSI and NAV SECTOR MFD formats.
Controls and Indicators
The figures that follow outline the controls and indications relevant to VHF
navigation. Refer to Chapter 6 Communications, and Chapter 11 Flight Instruments
for additional information on the Radio Tuning Unit (RTU) and EFIS displays.
NAVIGATION SYSTEMS
For Training Purposes Only
May 03
17-57
P I LOT T R A I N I N G GU I D E
VHF Navigation RTU Display
Figure 17-41
Preset/Recall
Indicator
Tune Window
VHF NAV Preset
Frequency Display
NAV Main Page
VHF NAV Active
Frequency
Selector Key
VHF NAV Active
Frequency
Display
Marker Beacon
Sensitivity
Selector Key
IDENT
DME-H
1/2
BRT
BRT
108.50
ACT PRE
109.00
NAV1
ACT PRE
123.45 134.92
COM1
195.5
ADF1 TCAS
AUTO
ATC1
NEXT
PAGE 4567
TONE
REL
HI
IDENT
DME-H
1/2
BRT
BRT
ACT PRE
108.5 109.50
NAV1
MKR
RETURN
TONE
SENS
DME
113.50
LO HI
VHF NAV
Frequency
Change/Radio
Page Key
VHF NAV Active
Frequency
Display
Marker
Beacon
Sensitivity
Indicator
RTU Top Level
Page
Preset/Recall
Frequency
Selector Key
VHF NAV Preset
Frequency Display
Tune Knobs
P604_17_023
NAVIGATION SYSTEMS
17-58 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Audio and Display Control Panel
Figure 17-42
No. 1/2 Bearing Pointer
Source Switches
Push to select No.1/2
(single/dual bar) source:
-OFF
-VOR 1/2
-ADF 1/2-FMS 1/2
-(FMS 3)
Source indicated on
PFD/MFD.
NAV
SOURCE
FORMAT RANGE
BRG TERR WX TFC
PUSH
X- SIDE
1 - VHF - 2
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