Gps Navigation - Cirrus DESIGN SR20 Information Manual

Section 7 Cirrus Design
Airplane Description SR20

GPS Navigation

The airplane is equipped with two GPS navigators. The Garmin GNS
430 navigator is the primary system, is IFR certified, and is coupled to
the airplane's CDI and Multi-Function display. The Garmin GNC
250XL provides backup and is approved for VFR use only. GPS1
navigators are capable of providing IFR en route, terminal, and
approach navigation with position accuracies better than 15 meters.
GPS1 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 GPS1
antenna is located above the headliner along the airplane centerline.
The GPS2 antenna is located below the glareshield and behind the
ARNAV MFD. All GPS navigator controls and functions are accessible
through the GPS receiver units' front control panels located in the
center console. The panels include function keys, power switches,
MSG and Nav status annunciators, a color LCD display (GNS 430), a
monochromatic display (GNC 250XL), two concentric selector knobs
on each panel, and a Jeppesen NavData card slot in each panel. The
displays are daylight readable and automatically dimmed for low-light
operation. The GNS 430 navigator is powered by 28 VDC through the
5-amp GPS1 and 7.5-amp COM1 circuit breakers on the Avionics
Essential Bus. The GNC 250XL navigator is powered by 14 VDC
through a 28 to 14 VDC converter mounted under the center console.
28 VDC to power the voltage converter is supplied through the 7.5-
amp COM2 circuit breaker 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.
7-72 P/N 13999-002 Info Manual
September 2011