Cirrus DESIGN SR20 Information Manual page 355

Cirrus Design
SR20
channels). The tuning controls are located at the left side of the GNC
420 front panel. Frequency tuning is accomplished by rotating the
large and small concentric knobs to select a standby frequency and
then transferring the frequency to the active window. The COM
frequency display window is at the upper left corner of the GNC 420
display. Auto-tuning can be accomplished by entering a frequency
from a menu. The COM 2 antenna is located below the cabin on the
airplane centerline. 28 VDC for transceiver operating is controlled
through the Avionics Master Switch and supplied through the 7.5-amp
COM2 circuit breaker on the Avionics Non-Essential Bus.
TERRAIN Interface*
*TERRAIN functionality is a standard feature found in GNC
420 units with main software version 5.01 or above and valid
terrain and obstacle databases installed.
Garmin TERRAIN is a terrain awareness system incorporated into
GNC 420 units to increase situational awareness and aid in reducing
controlled flight into terrain. The TERRAIN function displays altitudes
of terrain and obstructions relative to the aircraft's altitude and are
advisory in nature only. Individual obstructions may be shown if
available in the database, however, not all obstructions may be
available in the database and data may be inaccurate. TERRAIN
information should be used as an aid to visual acquisition and not use
to navigate or maneuver to avoid terrain.
For for a more detailed description of the TERRAIN function, refer to
the Garmin GNC 420 Pilot's Guide and Reference, P/N 190-00140-20,
Revision H dated May 2006 or later revision.
P/N 11934-S23
Revision 02: 08-15-07
• Note •
Section 9
Supplements
7 of 8