31
The communication radios and navaids are tuned through the self-contained navigation system
(SCNS) control head. After pressing the
TUNE
button on the SCNS control head, you are
presented with this screen:
The TUNE 1-3 has a “hot” scratchpad (gray field at the bottom of the screen) that allows the
crew to enter frequencies or preset channels to tune the radios.
With an empty scratchpad, pressing the line select key (LSK) corresponding to a radio swaps
between 1 and 2 (Example, pressing the top left line select key (LSK 1L) with an empty
scratchpad swaps between UHF1 and UHF2).
To clear the scratchpad, press the CLR button.
To enter a discrete frequency: Enter a frequency directly (including the decimal point, e.g.
“318.1” into the scratchpad and line select it into the appropriate radio.
To enter a preset, type the number of the preset into the scratchpad and line select it into the
appropriate radio. For example, to enter preset 20 in UHF-1, enter “20” in the scratchpad and
then hit LSK 1L. The actual frequency will be displayed, followed by a slash and the preset
number: “308.700/20”
Entry of “0” and line selecting the appropriate radio returns you to the last used frequency/preset.
TUNE
1-3
08:12:23
UHF1 ON
225.400
VHF1 ON
121.800
TAC1 ON
111
X
DA/GS
3
R
/ 240
VOR 1 ON
W/V 246
M
/ 12
116.4
TAS 240
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