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operating mode of the associated function.
The RMU also has other display modes, called pages, which perform additional
features and functions for the control of the radio system. A menu of the pages is
provided to access these additional functions.
Located on the front of the RMU is a button labeled, PGE which, when pressed, causes
the system page menu to be displayed. Pressing PGE will allow the selection of other
functions such as:
• Radio page Normal tuning
• COMM memory Preset COMM frequencies
• NAV memory Preset VOR NAV frequencies
• ATC/TCAS ATC/TCAS display frequencies
• HF control Preset and Direct tune modes
• Maintenance Access to maintenance data (only on ground)
RMU-1 RMU - 2
VHF COM - 1 VHF COM - 2
VHF NAV - 1 VHF NAV - 2
DME - 1 DME - 2
ADF - 1 ADF - 2
ATC - 1 ATC - 2
TCAS DSPY 1 TCAS DSPY 2
HF - 1 HF - 2
For Training Purposes Only
Sept 04
5-11
P I LOT T R A I N I N G GU I D E
COMMUNICATIONS
GENERAL COLOR PHILOSOPHY
For radio parameters the RMU provides a local tune color and a remote tune color.
Local tune is performed on the same RMU it is observed on. Remote tune is performed
on another tuning source, the other RMU or the FMS. Following local tune, the tuned
item changes to the local tuned color.
Following remote tune, the tuned item changes to yellow, with one exception - an
FMS database tune (auto tune) of the NAV display channel, which is magenta.
ITEM LOCAL TUNE COLOR EXAMPLE
VHF 1 and 2 White NAV Display Channel
Preset Data Cyan COM Preset Channel
Mode Data Green ADF Mode
FMS Data Magenta Nav Auto Annunciator
ITEM LOCAL TUNE COLOR EXAMPLE
Channel Data Yellow NAV Display Channel
Preset Data Yellow COM Preset Channel
Mode Data Yellow ADF Mode
FMS Data Base Magenta Nav Auto Annunciator
GX_05_012
TUNE
SQ
ID
DIM
PGE
1/2
TST
STO
DME
COM 1 NAV 1
TCAS DSPY 1
ATC-TCAS
HF 1
ADF 1
RANGE: 6 15423
15600
LV
1 ATC ALT ADF
MEMORY-4 MEMORY-1
NORMAL
121.82
118.02
1200
117.45
110.00
1799.5
P I LOT T R A I N I N G GU I D E
COMMUNICATIONS
5-12 For Training Purposes Only
Sept 04
Other items which are not radio parameters, such as page banners and window labels,
also follow a general color philosophy. The page banners and window labels are white
when the on-side is selected, and are magenta when the off-side system is selected.
Example: on RMU 1, the HF window label is white when HF 1 is selected, and is
magenta when HF 2 is selected from RMU 1.
TRANSFER KEYS
The transfer key, when pushed, flip-flops the active (top line) frequency and the preset
(bottom line) frequency of the respective VHF COM, VHF NAV, or HF COM window.
Example below:
LINE SELECT KEYS
The first push of the line select key moves the yellow curser to surround the data field
associated with that particular line select key. It also electronically connects that data
field to the tuning knobs so that the frequency or mode may be changed. For some
functions, additional pushes of the line select key will toggle modes or recall stored
frequencies. The line select key, when pressed and held for certain functions, allows
the ADF and ATC memories to be recalled, and to enter and exit direct tune mode for
the VHF COM and the VHF NAV.
ITEM FIXED TUNE COLOR EXAMPLE
Field Labels Cyan TCAS INTRUDER ALTITUDE
Key Labels Cyan Page Menu HF CONTROL key
Caution/Notice Yellow Transponder ATT ERR
GX_05_013
COM 1 NAV 1
ATC-TCAS ADF 1
TEMP-1 TEMP-1
130.27
118.00
112.00
113.10
COM 1 NAV 1
ATC-TCAS ADF 1
TEMP-1 TEMP-1
118.00
130.27
112.00
113.10
GX_05_014
COM 1 NAV 1
ATC-TCAS ADF 1
TEMP-1 TEMP-1
118.00
130.27
1200
112.00
113.10
1799.5
For Training Purposes Only
Sept 04
5-13
P I LOT T R A I N I N G GU I D E
COMMUNICATIONS
FUNCTION KEYS AND TUNING KNOB
Function keys provide control of system data/configuration. The tuning knobs are used
to modify the data field enclosed by the curser. This may be frequency or mode
depending on the data field.
FUNCTION KEYS
Pressing the squelch (SQ) key opens the COM radio squelch and allows any noise or
signal present in the radio to be heard in the audio system. The letters “SQ” are
annunciated along the top line of the VHF COM window (if the curser is in the
window), or the HF COM window (curser in the HF COM window).
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