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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
BRT
BRT
ACT PRE
108.50 149.10
NAV1
MKR
RETURN
TONE
SENS
DME
108.50
LO HI
IDENT
DME-H
1/2
BRT
BRT
ON
SQUELCH
ACT PRE
123.45 134.92
COM1
RETURN
TONE
OFF
KNOB SEL
8.33 25
PRIMARY TOP LEVEL DISPLAY
FREQ Change Swap Key
TUNE
SWAP
- tune window in view,
use tuning knob. Tune
window not in view, push
key, then use tuning knobs.
PRE label comes ON.
- push key to
interchange preset and
active frequencies. RECALL
label comes ON.
COM Source
Annunciator
NAV Main Page
Used to select
navigation frequencies
DME Frequency Readout
Indicates frequency of
DME receiver
MKR SENS Readout
Used to adjust marker
beacon sensitivity
Frequency Readout
Indicates active NAV
frequency
COM PAGE
NAV PAGE
P604_06_007
Line Select Key
Toggles between 8.33 /
25 kHz modes of operation
COMMUNICATIONS
6-16 For Training Purposes Only
Jan 04
P I LOT T R A I N I N G GU I D E
COM 3 Selections
Figure 6-8
IDENT
DME-H
1/2
BRT
BRT
ON
SQUELCH
ACT PRE
123.45 134.92
COM1
RETURN
TONE
OFF
KNOB SEL
8.33 25
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
IDENT
DME-H
1/2
BRT
BRT
123.45
ACT PRE
134.92
COM3
ACT PRE
19.4560 8.0040
HF1
TONE
UV
SQ0
23.4687
RETURN
Return Key
When pushed, returns
to top level page. All
changes carried
forward.
PRIMARY TOP LEVEL DISPLAY
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