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backup tuning unit or by the FMS control display unit. The radio tuning units (RTU’s) are the
primary radio communication system radio tuning source. (Refer to Chapter 5,
Communications, for information on the radios and backup tuning unit).
The VOR/LOC receivers operate in the following frequency ranges:
S VOR frequencies -- All even frequencies from 108.00 to 111.90 MHz and all frequencies
from 112.00 to 117.95
S LOC frequencies -- All odd frequencies from 108.10 to 111.95 MHz.
The NAV receivers monitor the selected VOR stations and provide enroute and terminal
area navigation. The VOR data is displayed on the pilots and copilots PFD and MFD.
In LOC and GS modes, the NAV receivers supply final approach guidance data. Localizer
signals are monitored for horizontal deviation and glideslope signals are monitored for
vertical deviation. When the navigation receiver is tuned to a localizer frequency, the paired
glideslope frequency is automatically tuned. The LOC/GS data is displayed on the pilots
and copilots PFD and MFD.
The Marker Beacon (MB) system provides information on distance to the runway. The MB
antennas receive signals from the outer, middle and inner MB ground transmitters. The
signals are then supplied to the receivers. MB information is displayed on the pilots and
copilots PFD. MB sensitivity can be adjusted at the radio tuning units.
The VHF/NAV system also supplies VOR/LOC and MB station identification to the audio
integrating system.
REV 56, Jan 31/03
Vol. 1 18--30--2
NAVIGATION SYSTEMS
VHF Navigation
Flight Crew Operating Manual MASTER
CSP A--013
VHF Navigation System --- Block Diagram <MST>
Figure 18---30---1
MKR
VOR/LOC
G/S
MKR
INTEGRATED
AVIONICS
PROCESSOR
SYSTEM
GROUND PROXIMITY
WARNING SYSTEM
STANDBY ATTITUDE
DIRECTOR (GS/LOC)
INDICATOR
AUDIO SYSTEM
MKR
VOR/LOC
VHF NAV
No.2
RCVR
CH A
VHF NAV
No.1
RCVR
CH B
CONT
CONT
CONT
VHF 1
ONLY
RTU 1
RTU 2
HEAD--UP GUIDANCE
SYSTEM <0026>
FMS
<0024><0050>
DC
BUS 2
D6 H9
DC
ESS
CH A
CH B
MKR
VOR/LOC
COUPLER
Vol. 1 18--30--3
REV 56, Jan 31/03
NAVIGATION SYSTEMS
VHF Navigation
Flight Crew Operating Manual
CSP A--013
MASTER
VHF Navigation --- Radio Tuning Unit <MST>
Figure 18---30---2
NAV Key
Push key once to directly
tune active frequency
with tuning knobs.
Push key twice to select
NAV main page.
Radio Tuning Unit -- Top Level Page
Center Pedestal
Radio Tuning Unit -- NAV Main Page
Center Pedestal
Tuning Knob
Tuning Window
NAV Frequency Readout (green)
MKR SENS Key
Used to select marker
sensitivity high or low.
Selected setting is
displayed in cyan.
MK--HI Indicator
Displayed when marker
sensitivity is selected
high.
NAV Frequency Readout (green)
<0012> <0012>
<0024><0050>
AUT Indicator
Displayed when
automatic tuning of the
navigation radios is
selected on the FMS.
<0024><0050>
REV 56, Jan 31/03
Vol. 1 18--30--4
NAVIGATION SYSTEMS
VHF Navigation
Flight Crew Operating Manual MASTER
CSP A--013
VHF Navigation <MST>
Figure 18---30---3
1 -- MKR -- 2
Press to monitor
marker beacon signals.
When lit, rotate to
increase volume.
Press again to deselect
marker beacon signals.
Audio Control Panel
Center Pedestal
Display Control Panel
Pilot’s and Copilot’s Side Panels
BRG
Used to select next
waypoint that
bearing pointer will
indicate direction to.
1 -- NAV -- 2
Press to monitor
navigation receiver.
When lit, rotate to
increase volume.
Press again to
deselect navigation
receiver audio.
PUSH X--SIDE
Used to display
opposite side
navigational
source on MFD.
<0008> <0011> <0014>
<0011> <0008> <0014>
1 -- VHF -- 2 INT/SVC
PA
HF 1 -- VHF -- 2 INT/SVC
PA
VHF 3
PA
<0060>
PA
NAV SOURCE
Used to select
navigation source.
Clockwise rotation
will be FMS1,
VOR/LOC1, OFF,
VOR/LOC2 and
FMS2.
PA
<0008> <0014> <0060>
<0040>
Vol. 1 18--30--5
REV 56, Jan 31/03
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