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GNC 420/420A Quick Reference
KEYS AND KNOBS
2
190-00140-21 Rev. F
Large left knob
Large right knob
Small left knob
Small right knob
NRST
OBS
MSG (message)
FPL (flight plan)
PROC (procedures)
COM Power/ Volume
COM Flip-flop
CLR (clear)
ENT (enter)
MENU
RNG (map range)
Direct-to
1
2
3
4
5
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9
10
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14
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16
GNC 420
4 6
3
2
5
8
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7
1
10 11 12
13
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16
Figure 1-1 Keys and Knobs
LEFT-HAND KEYS AND KNOBS
The COM Power/Volume Knob controls unit power
and communications radio volume. Press momentarily to
disable automatic squelch control.
The large left knob is used to tune the megahertz (MHz)
value of the standby frequency for the COM transceiver.
The small left knob is used to tune the kilohertz (kHz)
value of the standby frequency for the COM transceiver.
The COM Flip-flop Key is used to swap the active
and standby COM frequencies. Press and hold to select
emergency channel (121.500 MHz).