7.11 External Switches
External switches may be installed and interfaced to the GTN. These switches
may be stand alone, or integrated with a TAWS or GPS annunciator. Table 4
lists the switches and function they perform:
Switch Label
CDI
COM CHAN DN
COM CHAN UP
COM RMT XFR
NAV RMT XFR
OBS
OBS/SUSP
TERR INHB
PTC
7.12 Airspace Depiction and Alerts
The GTN aides the flight crew in avoiding certain airspaces with Smart Airspace
and airspace alerts. Smart Airspace de-emphasizes depicted airspace that is not
near the aircraft's current altitude. Airspace Alerts provide a message indication
to the flight crew when the aircraft's current ground track will intercept an
airspace type that has been selected for alerting.
Smart Airspace and Airspace Alerts are separate features.
Turning on/off Smart Airspace does not affect Airspace
Alerts, and vice versa.
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Toggles between GPS / VLOC sources. This
switch may be part of an external annunciator
panel.
Toggles down through the preset com
frequencies.
Toggles up through the preset com frequencies.
Transfers the COM active / standby frequencies.
Transfers the NAV active / standby frequencies.
Performs an OBS or SUSP function. This switch
is part of an external annunciator panel and is
placarded with the following: "Green OBS
indicates OBS or SUSP mode – GTN
annunciator bar indicates which is active. Push
OBS button to change OBS or SUSP mode."
Performs an OBS or SUSP function.
Toggles the TAWS Inhibit function on/off. This
switch is part of an external annunciator panel.
The terrain display is still presented if TAWS is
Inhibited.
Push-to-Command switch for Voice Command
input to the GMA and the GTN.
Table 4 – External Switches
NOTE
AFMS, Garmin GTN GPS/SBAS System
Function
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