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frequency with the preset frequency. Pressing the line select key adjacent to the active
frequency twice, brings up the COM main page.
On the main page, pressing the line select key adjacent to the SQUELCH field toggles
the squelch ON or OFF. The selected state is displayed in large cyan letters. The
inactive state is displayed in smaller white letters.
If no entry is made on the main page within 20 seconds, the radio tuning unit display
will return to the default top level page. The operator can press the line select key next
to the RETURN line to return to the top level page at any time.
REV 56, Jan 31/03
Vol. 1 05--30--2
COMMUNICATIONS
Radio Communication System
Flight Crew Operating Manual MASTER
CSP A--013
If the squelch is selected OFF, a SQ OFF message is displayed on the top level page.
Since Squelch ON is considered the normal operating mode it is not displayed on the
top level page. When a COM transceiver is transmitting, a TX annunciation is displayed
in cyan letters below and to the right of the active frequency field on the top level page.
The radio tuning units continuously monitor the status of the VHF COM transceivers
and if any discrepancy is detected between the commanded frequency and the actual
tuned frequency, the frequency indication is replaced by white dashes to warn the pilot
of the inconsistency.
Vol. 1 05--30--3
REV 56, Jan 31/03
COMMUNICATIONS
Radio Communication System
Flight Crew Operating Manual
CSP A--013
MASTER
Radio Tuning Unit <MST>
Figure 05---30---1
COM FREQUENCY
READOUT (GREEN)
Radio Tuning Unit -- COM Main Page
Center Pedestal
TUNING KNOB
COM Key
Push key once to
directly tune active
frequency with tuning
knobs. Push key twice
to select COM main
page.
TUNING WINDOW
COM FREQUENCY
READOUT (GREEN)
SQUELCH Key
Used to select squelch
on or off.
Selected setting is
displayed in cyan.
SQ OFF Indicator
Displayed when
squelch is selected
off.
TX Indicator
Displayed when
radio is transmitting.
<0008>
Radio Tuning Unit --
Top Level Page
Center Pedestal
<0012> <0012>
Freq/Mode/Code
Readout
Indicates frequency,
mode or code
(as applicable) for
radio indicated.
<0012>
ATC Identification
(ID) Pushbutton
Pushed at ATC request; causes
an additional identification pattern
on ATC ground radar screen.
<0012>
AUT (Auto Tune)
Indicates that automatic tuning of the NAV
radios has been selected on the FMS.
<0024> <0050>
PRE or RECALL
PRE -- Frequency was changed by tuning knobs.
RECALL -- Frequency was swapped with active frequency.
DME Hold (DME--H)
Pushbutton
Left Side/Right Side
(1/2) Pushbutton
Push to select left
side (1) or right side (2)
radios, for displays of
tuning. Side indicated
adjacent to radio label.
<0014>
REV 56, Jan 31/03
Vol. 1 05--30--4
COMMUNICATIONS
Radio Communication System
Flight Crew Operating Manual MASTER
CSP A--013
B. Backup (Standby) Tuning Unit
Under normal conditions the backup tuning unit is in standby mode and acts as a
system monitor displaying the echoed frequencies from the radios. The backup tuning
unit provides radio control in the event of the loss of both radio tuning units and the
flight management system. The active frequencies are stored in non-volatile memory
and can be recalled after a power interruption.
When the backup tuning unit is switched on, it takes over control of the left side VHF
COM 1 and NAV 1, and overrides all other controls.
Radio tuning unit inhibit switches, on the backup tuning unit, are used to disable a failed
primary radio tuning unit. Cross-side tuning can then be accessed by using the 1/2
cross-side key on the serviceable radio tuning unit. Not all available radios can be
displayed on the radio tuning unit at once. Switching back and forth with the 1/2 key is
required to display all of the radios. When both radio tuning units fail, the displays go
blank and cross-side tuning becomes inoperative.
Vol. 1 05--30--5
REV 56, Jan 31/03
COMMUNICATIONS
Radio Communication System
Flight Crew Operating Manual
CSP A--013
MASTER
Backup Tuning Unit <MST>
Figure 05---30---2
Backup Tuning Unit
Center Pedestal
FMS TUNE INHIBIT
Used to inhibit the
auto tune functions
of the FMS. TX Indicator
Indicates that
VHF 1 transceiver
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