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GNC 420/420A Quick Reference
NAVCOM PAGE
14
190-00140-21 Rev. F
Inhibiting TERRAIN:
1) Select the TERRAIN Page and press the MENU
Key. ‘Inhibit Terrain?’ is selected by default.
2) Press the ENT Key. The ‘TER INHB’ annunciation
is displayed in the TERRAIN annunciator field
when TERRAIN is inhibited.
Annunciator Field
NOTE: Inhibit mode deactivates TERRAIN alerting
when deemed unnecessary by the pilot. Flying
VFR into an area where unique terrain exists could
cause the system to annunciate nuisance alerts.
Pilots should use discretion when inhibiting the
TERRAIN system and always remember to enable
the system when appropriate.
NAVCOM PAGE
The NAVCOM Page provides a list of the airport
communication and navigation frequencies at the
departure, enroute, and arrival airports.
Frequency Type
Departure, Enroute, or
Arrival Airport
Assigned Frequency and
Usage Information (When
Applicable)
Scroll
Bar
Selecting a frequency list for a departure,
enroute, or arrival airport:
1) Press the small right knob to activate the
cursor.
2) Turn the large right knob to place the cursor
on the airport identifier field (top line on the
NAVCOM Page).
3) Turn the small right knob to select the desired
airport and press the ENT Key.
Scrolling through the list of frequencies:
1) Activate the cursor, if not already active, by
pressing the small right knob.
2) Turn the large right knob to move the cursor
through the list of frequencies. If there are
more frequencies in the list than can be
displayed on the screen, a scroll bar along the
right-hand side of the screen indicates which
part of the list is currently being displayed.
Auto tuning a frequency from the NAVCOM
Page:
1) Highlight the desired frequency by scrolling
through the list of frequencies, as described in
the preceding procedure.
2) To place a frequency in the standby field of the
COM Window, highlight the desired frequency
and press the ENT Key. (NAV frequencies are
shown for reference only.)
BOTTOM ROW ANNUNCIATORS AND MESSAGES
See Pilot’s Guide for detailed information.