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coupled to the CDI and is also approved for IFR use.
The GPS 1 antenna is located on top of the fuselage slightly aft of the
rear window along the airplane centerline and the GPS 2 antenna is
located on top of the fuselage slightly forward of the rear window along
the airplane centerline. The GNS 430W Navigator is powered by 28
VDC through the 5-amp GPS 1 circuit breaker on the Avionics
Essential Bus.
Navigation (NAV) Receiver
The GNS 430W provides an integrated Navigation (NAV) receiver with
VHF Omnirange/Localizer (VOR/LOC) and Glideslope (G/S) capability.
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.
Revision 01: 11-11-07
8 of 10 P/N 11934-S38
Section 9 Cirrus Design
Supplements SR20
Communication (COM) Transceiver
The GNS 430W includes a digitally-tuned integrated VHF
communications (COM) transceiver. 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 COM 1 circuit
breaker on the Avionics Essential Bus.
Avionics Integration
The GNS 430W Navigator is integrated into the airplane avionics
installation in three configurations:
1. Single GNS 430W (GPS 1) interfaced with the PFD and MFD and
a single Garmin GNC 250XL (GPS 2) interfaced with the PFD and
MFD.
• GPS 1 in this configuration is a GNS 430W Navigator with VHF
COM interfaced with the PFD and MFD as GPS 1/VLOC 1.
Select NAV Source to GPS 1 or VLOC 1 through the PFD’s
NAV select button. With source set to GPS 1 or VLOC 1, it can
be alternately set between GPS or VLOC by the CDI button on
the navigator. The active source is identified on the PFD.
• GPS 2 in this configuration is a GNC 250XL Navigator
interfaced with the PFD and MFD as GPS 2. Select NAV
Source to GPS 2 through the PFD’s NAV select button. The
active source is identified on the PFD.
2. Single GNS 430W (GPS 1) interfaced with the PFD and MFD and
a single GNC 420W (GPS 2) interfaced with the MFD (VOR/LOC)
indicator.
• GPS 1 in this configuration is a GNS 430W Navigator with VHF
COM interfaced with the PFD and MFD as GPS 1/VLOC 1.
Select NAV Source to GPS 1 or VLOC 1 through the PFD’s
NAV select button. With source set to GPS 1 or VLOC 1, it can
be alternately set between GPS or VLOC by the CDI button on
the navigator. The active source is identified on the PFD.
• GPS 2 in this configuration is a GNS 420W Navigator with VHF
COM interfaced with the PFD and MFD as GPS 2. Select NAV
Source to GPS 2 through the PFD’s NAV select button. The
active source is identified on the PFD.
Revision 01: 11-11-07
P/N 11934-S38 9 of 10
Cirrus Design Section 9
SR20 Supplements
3. Dual GNS 430W units are installed. GPS 1 in this configuration is
the uppermost GNS 430W unit in the console and GPS 2 is the
lower GNS 430W unit.
• GPS 1 in this configuration is a GNS 430W Navigator with VHF
COM interfaced with the PFD and MFD as GPS 1/VLOC 1.
Select NAV Source to GPS 1 or VLOC 1 through the PFD’s
NAV select button. With source set to GPS 1 or VLOC 1, it can
be alternately set between GPS or VLOC by the CDI button on
the navigator. The active source is identified on the PFD.
• GPS 2 in this configuration is a GNS 430W Navigator with VHF
COM interfaced with the PFD and MFD as GPS 2/VLOC 2.
Select NAV Source to GPS 2 or VLOC 2 through the PFD’s
NAV select button. With source set to GPS 2 or VLOC 2, it can
be alternately set between GPS or VLOC by the CDI button on
the navigator. The active source is identified on the PFD.
Revision 01: 11-11-07
10 of 10 P/N 11934-S38
Section 9 Cirrus Design
Supplements SR20
TERRAIN Interface
• Note •
TERRAIN functionality is a standard feature found in GNS
430W 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 430W 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
　
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