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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.
• 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.
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P/N 13772-104 5 of 8
Cirrus Design Section 9
SR22 Supplements
GPS Course Remote Display
GNC 420 GPS course information is displayed on the airplane CDI.
• Note •
Since the GNC 420 does not provide ILS outputs, the CDI
utilized in this installation does not provide glideslope display.
Deactivate GPS
1. Navigator Com/ Power Switch .......................... Rotate CCW ‘OFF’
Section 5 - Performance
No change from basic Handbook.
Section 6 - Weight & Balance
No change from basic Handbook.
Section 7 - Systems Description
• Note •
This supplement provides a general description of the
GARMIN GNC 420, its operation, and SR22 interface. For a
detailed description of the GNC 420 and full operation
instructions refer to the GARMIN GNC 420 Pilot's Guide and
Reference, P/N 190-00140-20, Revision B dated August 2002
(or later appropriate revision).
GNC 420 Integrated GPS/COM System
This airplane is equipped with a GNC 420 integrated GPS navigator
and COM transceiver. The GPS navigator consists of a GPS receiver,
a navigation computer, and a Jeppeson NavData database all
contained in the GNC 420 control unit mounted in the center console.
The GPS is designated ‘GPS 2.’ Additionally, a VHF communications
receiver, designated COM 2, is also integrated into the unit. All tuning
and display controls for the GPS and COM are located in the GNC 420
control/display in the center console. The following paragraphs
describe the GPS and COM functions of this unit. For a complete
description, as well as full operating instructions, refer to the GARMIN
GNC 420 Pilot’s Guide and Reference.
Revision 2: 08-15-07
6 of 8 P/N 13772-104
Section 9 Cirrus Design
Supplements SR22
GPS Navigator
The GARMIN GNC 420 GPS navigator is the secondary system (GPS
2), is IFR certified, and is coupled to the airplane’s CDI. The GARMIN
GNC 420 GPS navigator 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. The GPS 2 antenna is located under the glareshield along
the airplane centerline. All GPS navigator controls and functions are
accessible through the GNC 420 front control panel located in the
center console. The panel includes function keys, power switches,
MSG and Nav status annunciators, color LCD display, two concentric
selector knobs on each panel, and a Jeppesen NavData card slot in
each panel. The GNC 420 navigator is powered by 28 VDC through
the 5-amp GPS2 and 7.5-amp COM 2 circuit breakers on the Avionics
Non-Essential Bus.
The Jeppesen Navigation Database provides access to data on
Airports, Approaches, Standard Instrument Departures (SIDs),
Standard Terminal Arrivals (STARs), VORs, NDBs, Intersections,
Minimum Safe Altitudes, Controlled Airspace Advisories and
Frequencies. North American and International databases are
available. Database information is provided on a card that can be
inserted into the card slot on the GPS unit. Subscription information is
provided in a subscription packet provided with each system.
Communication (COM) Transceiver
The GNC 420 includes a digitally-tuned integrated VHF
communications (COM) transceiver. The transceiver and integrated
controls are mounted in the GARMIN GNC 420 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
　
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