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SEL
STBY
1 2
ATC
SEL
FMS
TUNE
INHIB
RTU 1
INHIB
RTU 2
INHIB
IDENT
DME-H
1/2
BRT
BRT
116.30
ACT PRE
111.35
NAV1
ACT PRE
121.90 149.10
COM1
373.0
ADF 1 TCAS
TA
ATC1
NEXT
PAGE 5540
TONE
REL
IDENT
DME-H
1/2
BRT
BRT
116.30
ACT PRE
111.35
NAV1
ACT PRE
121.90 149.10
COM2
373.0
ADF 1 TCAS
TA
ATC1
NEXT
PAGE 5540
TONE
REL
COMMUNICATIONS
For Training Purposes Only
May 03
6-11
P I LOT T R A I N I N G GU I D E
Radio Tuning System
Description
The radio tuning system provides integrated control of airplane communication and
navigation radio subsystems. It supports full cross-side and reversionary tuning, thus
allowing single-point control of both on-side and cross-side radios from the pilot or
copilot positions.
Components and Operation
The radio tuning system consists of the following components:
• two radio tuning units (RTUs)
• one reversionary / inhibit panel
For the Flight Management System (FMS) tuning of communications, refer to Chapter
17 Navigation Systems under the heading “TUNE PAGE” in the FMS section.
Controls and Indicators
Radio Tuning Unit (RTU)
Line Select Keys
The RTU has eight panel-mounted line select keys adjacent to the display, four on the
left and four on the right of the display. Each key has a mechanical, momentary,
nonlatching action. The functions performed by these keys vary with each display
presented.
Dedicated Pushbuttons (IDENT, DME-H and 1/2)
There are three dedicated function pushbuttons on the RTU. These pushbuttons have
mechanical, momentary, nonlatching actions, but may have latched functions
implemented by system software.
Tune Knob Cluster
Two concentric knobs are used to tune frequencies (or select codes) for the RTU —
both knobs are rate-aided. The functions controlled by the tuning/code knobs include:
• active frequency/code
• preset frequency/code
• numbered preset channels in the preset field only
• HF COM squelch/emission mode values
COMMUNICATIONS
6-12 For Training Purposes Only
Jan 04
P I LOT T R A I N I N G GU I D E
The function to be tuned is selected using the line select keys. A tuning window is
displayed around the frequency/code to be tuned to confirm the selection.
Tuning Window
The tuning window is displayed as a rectangle around the frequency/code to be tuned
or modified. The default position for the tuning window on the primary top level
display is the VHF COM preset frequency.
When no activity is detected from the line select keys or tuning/
code knobs for 20 seconds, the display page reverts to the
primary top level display and the tuning window is placed at the
default position.
Radio Tuning Unit
Figure 6-5
NOTE
IDENT
DME-H
1/2
BRT
BRT
116.30
ACT PRE
111.35
NAV1
ACT PRE
121.90 149.10
COM1
373.0
ADF 1 TCAS
TA
ATC1
NEXT
PAGE 5540
STBY
TONE
REL
Tuning Knobs
Concentric knobs to select
frequencies or codes
Brightness (BRT) Control
Controls brightness of
displays
Line Select Keys
These keys can
function as:
- frequency
selector
- mode selector
- function selector
- line selector
depending on the
display
- page selector
Active Frequency Readout
Indicates frequency set at
COM radio (active)
Preset or Recall Frequency Readout
Pre
Recall
- frequency was changed by tuning
knobs; i.e. preset
- frequency was swapped with
active frequency
ATC Identification
(IDENT)
Pushbutton
Pushed at ATC
controller request,
causes an additional
identification pattern
on ATC ground
radar screen
DME-HOLD
(DME-H)
Pushbutton
When pushed,
holds DME at
current frequency
and allows
navigation receiver
to be independently
retuned
Left Side / Right Side
(1/2) Pushbutton
Push to select left side (1)
or right side (2) radios, for
tuning. Arrows indicate
side selected
P604_06_005
COMMUNICATIONS
For Training Purposes Only
Jan 04
6-13
P I LOT T R A I N I N G GU I D E
Active and Preset Frequencies/Codes
The preset frequency/code appears on the right side of the subdisplay. If the preset
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