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The RMU is mounted in the centre pedestal. It is a colour Liquid Crystal Display (LCD) based radio
tuning controller that provides centralized control and display of frequencies, channels, codes and
modes set on the communications and navigation receivers. Each RMU provides single point control
of both the on-side and cross-side radios. The RMUs provide on-side and cross-side access to the
following radios:
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
The RMU uses the concept of selecting a function by pushing a line select key next to the parameter
that you wish to control. Any selectable parameter may be changed by pressing the corresponding
line key next to the displayed parameter and then rotating the concentric tuning knobs to set the
desired value.
The RMU display is divided into dedicated windows. Each window groups the data associated with a
particular function of the radio system. The windows COM, NAV, ATC, HF, ADF and TCAS each
provide for complete control of frequency and 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 parameters.
• HF control: Preset and Direct tune modes.
• Maintenance: Access to maintenance data only on ground.
COMMUNICATIONS
REV 51, Aug 14, 2006 Flight Crew Operating Manual
CSP 700−6
Volume 2
06−10−9
RADIO MANAGEMENT SYSTEM (CONT'D)
General Colour Philosophy
GF0610_016
NB
REL
NORMAL
STANDBY ADF
LV
118.02
MEMORY−4
ALT:
MEMORY−1
110.00
ATC/TCAS ADF1
TCAS DSPY 1 HF1
COM1 NAV1
121.82 117.45
1200 1799.5
15423
15600
For radio parameters the RMU provides a local tune colour and a remote tune colour. Local tune is
performed on 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 colour.
Item Local Tune Colour 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
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 Remote Tune Colour 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
COMMUNICATIONS
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
06−10−10
RADIO MANAGEMENT SYSTEM (CONT'D)
General Colour Philosophy (Cont’d)
Other items which are not radio parameters, such as page banners and window labels, also follow
a general colour 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 magenta when HF 2 is selected.
Item Fixed Tune Colour Example
Field Labels Cyan TCAS INTRUDER ALTITUDE
Key Labels Cyan Page Menu HF CONTROL Key
Caution/Notice Yellow Transponder ATC ERR
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:
GF0610_020
TEMP−1
113.10
ATC/TCAS ADF1
130.27
TEMP−1
118.00 112.00
COM1 NB NAV1
ATC/TCAS ADF1
118.00
TEMP−1 TEMP−1
113.10
130.27 112.00
COM1 NB NAV1
Line Select Keys
The first push of the line select key moves the yellow cursor 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
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