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knob-operated frequency selection. IDENT audio output for VOR and
LOC is provided to the audio system. The Nav antenna is mounted on
top of the vertical tail. 28 VDC for navigation receiver operation is
controlled through the Avionics Master Switch on the bolster switch
panel and supplied through the 5-amp GPS 1 circuit breaker on the
Avionics Essential Bus. The airplane is equipped with a Garmin GNS
430 integrated GPS Navigator, Navigation (NAV) receiver with VHF
Omnirange/Localizer (VOR/LOC) and Glideslope receiver.
Communication (COM) Transceiver
The GNS 430 includes a digitally-tuned integrated VHF
communications (COM) transceiver. The transceiver and integrated
controls are mounted in the Garmin GNS 430 unit. The transceiver
receives all narrow- and wide-band VHF communication transmissions
transmitted within a frequency range of 118.000 MHz to 136.975 MHz
in 25.0 kHz steps (720 channels). For European operations, the COM
can be operator configured for 8.33 kHz channel spacing (2280
channels). The tuning controls are collocated with the NAV at the left
Revision 02: 08-15-07
10 of 10 P/N 11934-S22
Section 9 Cirrus Design
Supplements SR20
side of the GNS 430 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
GNS 430 display. Auto-tuning can be accomplished by entering a
frequency from a menu. The COM 1 antenna is located above 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 COM1 circuit breaker on the Avionics Essential Bus.
TERRAIN Interface*
• Note •
*TERRAIN functionality is a standard feature found in GNS
430 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
GNS 430 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 GNS 430 Pilot's Guide and Reference, P/N 190-00140-00,
Revision H dated May 2006 or later revision.
Revision 02: 08-15-07
P/N 11934-S23 1 of 8
Cirrus Design Section 9
SR20 Supplements
Pilot’s Operating Handbook and
FAA Approved Airplane Flight Manual
Supplement
For
Garmin GNC 420 GPS Navigator
• Note •
When a GARMIN GNC 420 GPS Navigator with VHF COM is installed
in the Cirrus Design SR20 this Supplement is applicable and must be
inserted in the Supplements Section (Section 9) of the Cirrus Design
SR20 Pilot’s Operating Handbook. This document must be carried in
the airplane at all times. Information in this supplement either adds to,
supersedes, or deletes information in the basic SR20 Pilot’s Operating
Handbook.
• Note •
This POH Supplement Revision dated Revision 02: 08-15-07
supersedes and replaces Revision 01 of this supplement
dated 05-25-05.
Serials 1005 thru 1267; This supplement supersedes GNC
420 GPS Navigator supplement, P/N 11934-S04 original
release or later.
Revision 02: 08-15-07
2 of 8 P/N 11934-S23
Section 9 Cirrus Design
Supplements SR20
Figure - 1
Section 1 - General
The airplane is equipped with a GARMIN GNC 420 GPS Navigator
with VHF Com herein referred to as the “Navigator.” The GNC 420 is
capable of providing IFR enroute, terminal, and approach navigation
with position accuracies better than 15 meters. The system utilizes the
Global Positioning System (GPS) satellite network to derive the
airplane’s position (latitude, longitude, and altitude) and the altitude
digitizer to enhance the altitude calculation.
Provided the GPS Navigator is receiving adequate usable signals, it
has been demonstrated capable of and has been shown to meet the
accuracy specifications of:
VFR/IFR, enroute, terminal, and instrument approach (GPS)
operations, that is, enroute, terminal, and instrument approach
　
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