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20X2 Leaflet 2 Revision 1, provided it is receiving usable
navigation information from the GPS receiver.
Section 3 - Emergency Procedures
1. If GPS Navigator information is not available or is invalid, utilize
remaining operational navigation equipment as required.
2. If “RAIM NOT AVAILABLE…” or “RAIM POSITION WARNING”
message is displayed, continue to navigate using the GPS
equipment or revert to an alternate means of navigation
appropriate to the route and phase of flight. When continuing to
use GPS navigation, position must be verified every 15 minutes
using another IFR approved navigation system.
Section 4 - Normal Procedures
The GARMIN GNS 430 Navigator is available in single or dual
installations. Operating procedures for each unit of a dual installation
are identical. Refer to the GNS 430 Integration paragraphs in this
supplement for integration differences when single and dual units are
installed. Normal operating procedures are outlined in the GARMIN
GNS 430 Pilot's Guide and Reference, P/N 190-00140-00, Revision A
dated December 1998 (or later appropriate revision).
Activate GPS
1. Battery Master Switch ............................................................... ON
2. Avionics Power Switch .............................................................. ON
3. Navigator COM/ Power Switch..................................... Rotate ‘ON’
The Navigator will display a welcome page while the self-test is in
progress. When the self test is successfully completed, the
Navigator asks for NavData database confirmation, acquires
position, and then displays the acquired position on the
Navigator’s display and on the ARNAV display.
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11934-S03 5 of 10
Cirrus Design Section 9
SR20 Supplements
• Note •
The Navigator is not coupled to an air and fuel data computer.
Manual fuel-on-board and fuel flow entries must be made in
order to use the fuel planning function of the AUX pages.
The GPS Navigator utilizes altitude information from the
altitude encoder’s altitude digitizer to enhance altitude
information.
GNS 430 Integration
The GNS 430 Navigator is integrated into the SR20 Avionics
installation in three configurations:
1. Single GARMIN GNS 430 (GPS 1) interfaced with the CDI and
ARNAV ICDS 2000 Multifunction Display and a single GARMIN
GNC 250XL (GPS 2) not integrated with a remote indicator.
a. In this configuration, pressing the alternate-action CDI pushbutton
on the GARMIN GNS 430 (GPS 1) alternately selects
GPS or NAV for display on the CDI each time the button is
pressed. The CDI source is indicated by illumination of the
“GPS” or “VLOC” annunciation in the lower left corner of the
GNS 430 display.
• Note •
The CDI displays course deviation from a VOR, Localizer
(LOC) or Glideslope (G/S) when VLOC is selected for display
and displays GPS track deviation when GPS is the selected
navigation source.
b. GPS 2 in this configuration is a GARMIN GNC 250XL GPS
Navigator with VHF COM. This unit displays GPS data on the
unit’s display panel only and is not integrated with any remote
indicator. Refer to the SR20 POH Supplement for GARMIN
GNC 250XL GPS Navigator, P/N 11934-S05.
2. Single GARMIN GNS 430 (GPS 1) interfaced with the HSI and
ARNAV ICDS 2000 Multifunction Display and a single GARMIN
GNC 420 (GPS 2) interfaced with the CDI (VOR/LOC) indicator.
a. In this configuration, pressing the alternate-action CDI pushbutton
on the GARMIN GNS 430 (GPS 1) alternately selects
GPS or NAV for display on the HSI and MFD each time the
Revised: May 25, 2005
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Section 05-25-05 Cirrus Design
11934-S03 R2 SR20
button is pressed. The HSI source is indicated by illumination
of the “GPS” or “VLOC” annunciation in the lower left corner of
the GNS 430 display.
• Note •
The HSI displays course deviation from a VOR, Localizer
(LOC), or Glideslope (G/S) when VLOC is the navigation
source and displays GPS track deviation when GPS is the
selected navigation source.
b. GPS 2 in this configuration is a GARMIN GNC 420 GPS
Navigator interfaced with the CDI (VOR/LOC Indicator). This
unit displays GPS data on the unit’s display panel and on the
remote CDI (VOR/LOC Indicator). Refer to the SR20 POH
Supplement for GARMIN GNC 420 GPS Navigator, P/N
11934-S06.
3. Dual GARMIN GNS 430 units are installed. GPS 1 in this
configuration is the uppermost GNS 430 unit in the console and
GPS 2 is the lower GNS 430 unit.
　
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