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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
frequency/code has been tuned or otherwise modified, a PRE annunciator is displayed
above it. If the active and preset frequencies/codes are swapped, a RECALL
annunciator appears above the preset frequency/code. Additionally, if the tuning
window surrounds the preset frequency/code, an arrow appears to the right of the PRE
or RECALL annunciator to indicate that the next press of the associated line select key
will cause the active and preset frequency/code to swap.
Reversionary/Inhibit Panel
The reversionary/inhibit panel allows selective deactivation of either or both RTUs,
and/or inhibits the FMS from tuning the COM/NAV systems.
Reversionary/Inhibit Panel
Figure 6-6
RTU 1 (2) INHIBIT Switch/Lights
RTU 1
RTU 2
- when pressed in (latched), light comes on,
disables RTU 1 and enables direct cross-side
tuning of off-side radios (RTU 2 controlling COM 1,
NAV 1, etc.)
- when pressed in (latched), light comes on,
disables RTU 2 and enables cross-side tuning of
off-side radios (RTU 1 controlling COM 2, NAV 2).
FMS TUNE INHIB Switch/Light
When pressed in (latched), light comes
on and prevents RTUs from being
tuned by either FMS.
P604_06_006
INHIBIT PUSH
1-RTU-2 FMS TUNE
1 2
AFCS
SEL
STBY
1 2
ATC
SEL
FMS
TUNE
INHIB
RTU 1
INHIB
RTU 2
INHIB
COMMUNICATIONS
6-14 For Training Purposes Only
Jan 04
P I LOT T R A I N I N G GU I D E
Operation
The operation of the RTU is presented in a sequence that shows the top page followed
by the hierarchy of the selected system.
Display Hierarchy
The RTU display is two-level tiered for the VHF COM/NAV, ADF, ATC and TCAS
systems as follows:
• primary top level display
• main display page
The RTU display is three-level tiered for the auxiliary VHF COM (3) transceiver as
follows:
• primary top level display
• secondary top level display
• auxiliary VHF COM main
The RTU display is four-level tiered for the HF COM system as follows:
• primary top level display
• secondary top level display
• HF COM main
• number preset pages
COMMUNICATIONS
For Training Purposes Only
Sept 04
6-15
P I LOT T R A I N I N G GU I D E
.
COM/NAV Selections
Figure 6-7
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
TA
ATC1
NEXT
PAGE 4567
TONE
REL
25 SEL
IDENT
DME-H
1/2
　
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