CIRRUS DESIGN SR20, Pilot Operating Handbook, Page: 418 / 508

8 of 10 P/N 11934-S22
Section 9 Cirrus Design
Supplements SR20
This airplane is equipped with a GNS 430 integrated GPS navigator,
NAV receiver, and COM transceiver. The GPS navigator consists of a
GPS receiver, a navigation computer, and a Jeppeson NavData
database all contained in the GNS 430 control unit mounted in the
center console. The GPS is designated ‘GPS 1.’ A VHF NAV receiver
and tuner for receiving VHF Omnirange (VOR), Localizer (LOC), and
Glideslope (G/S) is also integrated into the control unit. The NAV
receiver is designated ‘NAV 1.’ Additionally, a VHF communications
receiver, designated ‘COM 1,’ is also integrated into the unit. All tuning
and display controls for the GPS, NAV, and COM are located in the
GNS 430 control/display in the center console. The following
paragraphs describe the GPS, NAV, and COM functions of this unit.
For a complete description, as well as full operating instructions,
refer
to the Garmin GNS 430 Pilot’s Guide and Reference .
GPS Navigator
The Garmin GNS 430 GPS navigator is the primary system (GPS 1),
is IFR certified, and is coupled to the airplane’s HSI (or HSI) and MFD.
Normally, the second GPS Navigator provides backup and is
approved for VFR use only. If the second GPS is also a Garmin 430, it
will be coupled to the CDI and is also approved for IFR use. The
Garmin GPS 430 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 1 antenna is located beneath the cabin roof along the
airplane centerline and the GPS 2 antenna is located under the
glareshield. All GPS navigator controls and functions are accessible
through the GNS 430 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
GNS 430 navigator is powered by 28 VDC through the 5-amp GPS1
circuit breaker on the Avionics 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
Revision 1: 05-25-05